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275
I7000/i701_doc.txt
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To: Users
From: Richard Cornwell
Subj: IBM 701 Simulator Usage
Date: 01-May-2006
COPYRIGHT NOTICE
The following copyright notice applies to both the SIMH source and binary:
Original code published in 1993-2007, written by Robert M Supnik
Copyright (c) 1993-2007, Robert M Supnik
IBM 701 simulator written by Richard Cornwell
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the "Software"),
to deal in the Software without restriction, including without limitation
the rights to use, copy, modify, merge, publish, distribute, sublicense,
and/or sell copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
ROBERT M SUPNIK OR RICHARD CORNWELL BE LIABLE FOR ANY CLAIM, DAMAGES OR
OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.
Except as contained in this notice, the name of Robert M Supnik or Richard
Cornwell shall not be used in advertising or otherwise to promote the sale,
use or other dealings in this Software without prior written authorization
from both Robert M Supnik and Richard Cornwell.
This memorandum documents the IBM 701 simulator.
The IBM 701 also know as "Defense Calculator" was introduced by IBM
on April 7, 1953. This computer was start of IBM 700 and 7000 line.
Memory was 2048 36 bit words. Each instruction could be signed plus
or minus, plus would access memory as 18 bit words, minus as 36 bit
words. There was a expansion option to add another 2048 words of
memory, but I can't find documentation on how it worked. Memory cycle
time was 12 microseconds. The 701 was withdrawn from the market
October 1, 1954 replaced by 704 and 702. A total of 19 machines were
installed.
1. Simulator Files
To compile the IBM 701, you must define USE_INT64 and I701 as part of the
compilation command line.
sim/ scp.h
sim_console.h
sim_defs.h
sim_fio.h
sim_rev.h
sim_tape.h
scp.c
sim_fio.c
sim_tape.c
sim/i7090/ i7090_defs.h
i701_cpu.c 701 CPU, Channel, interface
i7090_chan.c
i701_sys.c
i7090_cdr.c 701 specific peripherals
i7090_cdp.c
i7090_lpr.c
i7090_drum.c
i7000_defs.h Generic 7000 peripherals.
i7000_chan.c
i7000_mt.c
2. IBM 701 Features
The IBM 701 simulator is configured as follows:
device simulates
name(s)
CPU 701 CPU with 2KW of memory
CH 704 devices.
MT 729 magnetic tape controller, channel A (required)
CDR 711 card reader
CDP 721 card punch
LP 716 line printer
DR0 733 drum
The 701 simulator implements several unique stop condition:
- undefined CPU instruction
- divide check on a divide and halt instruction
- write select of a write protected device
The LOAD command will load a card binary image file into memory. An
octal dump file, or a psuedo assembly code.
2.1 CPU
Memory size is 2KW on a standard CPU.
CPU registers include the visible state of the processor as well as the
control registers for the interrupt system.
name size comments
IC 15 program counter
AC 38 accumulator
MQ 36 multiplier-quotient
SW1..SW6 1 sense switches 1..6
SW 6 sense switches
SL1..4 1 sense lights 1..4
ACOVF 1 AC overflow indicator
DVC 1 divide check indicator
IOC 1 I/O check indicator
The CPU can maintain a history of the most recently executed instructions.
This is controlled by the SET CPU HISTORY and SHOW CPU HISTORY commands:
SET CPU HISTORY clear history buffer
SET CPU HISTORY=0 disable history
SET CPU HISTORY=n enable history, length = n
SHOW CPU HISTORY print CPU history
SHOW CPU HISTORY=n print first n entries of CPU history
2.2 I/O Channels (CH)
The channel device on the 701 is only used by simulator, and has no controls
or registers.
2.3 Peripherals
2.3.1 711 Card Reader (CDR)
The card reader (CDR) reads data from a disk file. Cards are simulated
as ASCII lines with terminating newlines.
Card reader files can either be text (one character per column) or
column binary (two characters per column). The file type can be
specified with a set command:
SET CDR FORMAT=TEXT sets ascii text mode
SET CDR FORMAT=BINARY sets for binary card images.
SET CDR FORMAT=BCD sets for BCD records.
SET CDR FORMAT=CBN sets for column binary BCD records.
SET CDR FORMAT=AUTO Automaticly determines format.
or in the ATTACH command:
ATT CDR <file> attaches a file
The card reader can be booted with the:
BOOT CDR loads first 3 words of card.
Error handling is as follows:
error processed as
not attached report error and stop
end of file out of cards
OS I/O error report error and stop
2.3.2 721 Card Punch (CDP)
The card reader (CDP) writes data to a disk file. Cards are simulated
as ASCII lines with terminating newlines.
Card punch files can either be text (one character per column) or
column binary (two characters per column). The file type can be
specified with a set command:
SET CDP FORMAT=TEXT sets ascii text mode
SET CDP FORMAT=BINARY sets for binary card images.
SET CDP FORMAT=BCD sets for BCD records.
SET CDP FORMAT=CBN sets for column binary BCD records.
SET CDP FORMAT=AUTO Automaticly determines format.
or in the ATTACH command:
ATT CDP <file> attaches a file
Error handling is as follows:
error processed as
not attached report error and stop
OS I/O error report error and stop
2.3.3 716 Line Printer (LP)
The line printer (LP) writes data to a disk file as ASCII text with
terminating newlines. Currently set to handle standard signals to
control paper advance.
SET LP NO/ECHO Sets echoing to console of lineprinter output.
Error handling is as follows:
error processed as
not attached report error and stop
OS I/O error report error and stop
The Printer supports the following SPRA n selection pulses for controlling
spacing (spacing occurs before the line is printed):
SPRA 2 Single space.
SPRA 1 To top of form.
SPRA 3 Double space.
SPRA 4 Triple space.
SPRA 9 Suppress linefeed after print.
SPT Will skip if any printer line has been pulsed.
Defualt with no SPRA is to single space before printing.
2.3.4 729 Magnetic Tape (MTA)
There are 10 tape devices.
Each individual tape drive support several options: MTA used as an example.
SET MTn ONLINE Sets the mag tape drive online.
SET MTn OFFLINE Sets the mag tape drive offline and not ready.
SET MTn REWIND Sets the mag tape to the load point.
SET MTn LOCKED Sets the mag tape to be read only.
SET MTn WRITEENABLE Sets the mag tape to be writeable.
SET MTn LOW Sets mag tape to low density.
SET MTn HIGH Sets mag tape to high density.
Options: Density LOW/HIGH does not change format of how tapes are written. And
is only for informational purposes only.
Tape drives can be booted with:
BOOT MTn
2.3.4 733 Drum (DR)
Up to 16 units can be attached to the CPU. Each drum is 2048K words in size.
They are all stored in one file.
SET DR0 UNITS=n
Drum unit 0 can be booted with:
BOOT DR0
2.6 Symbolic Display and Input
The IBM 701 simulator implements symbolic display and input. Display is
controlled by command line switches:
-c display as BCD character
-m display instruction mnemonics
Input parsing is controlled by the first character typed in or by command
line switches:
' or -c BCD character
" or -s BCD string
alphabetic instruction mnemonic
numeric octal number
Instruction input uses standard 701 assembler syntax. There is one
basic instruction classes, memory reference.
opcode address

441
I7000/i7070_doc.txt
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To: Users
From: Richard Cornwell
Subj: IBM 7070 Simulator Usage
Date: 01-Dec-2006
COPYRIGHT NOTICE
The following copyright notice applies to both the SIMH source and binary:
Original code published in 1993-2007, written by Robert M Supnik
Copyright (c) 1993-2007, Robert M Supnik
IBM 7070 simulator written by Richard Cornwell
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the "Software"),
to deal in the Software without restriction, including without limitation
the rights to use, copy, modify, merge, publish, distribute, sublicense,
and/or sell copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
ROBERT M SUPNIK OR RICHARD CORNWELL BE LIABLE FOR ANY CLAIM, DAMAGES OR
OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.
Except as contained in this notice, the name of Robert M Supnik or Richard
Cornwell shall not be used in advertising or otherwise to promote the sale,
use or other dealings in this Software without prior written authorization
from both Robert M Supnik and Richard Cornwell.
This memorandum documents the IBM 7070 simulator.
The IBM 7070 was introduced in June 1960, as a replacement to the IBM 650.
It had core memory up to 10,000 10 digit words.
The 7072 was introduced November 1962 and the 7074 on November 1961.
The 7074 is a faster version of the 7070 with the addition of memory up
to 40,000 10 digit words. The first 100 memory locations can be used as
index registers. Most memory reference instructions allow for a field
of digits to be selected to operate on and not modify the rest.
The 7070 is a decimal machine with each word consisting of 10 digits
plus a sign. The sign can be plus, minus or alpha. Alpha data is stored
5 characters to a word (2 digits per character).
1. Simulator Files
To compile the IBM 7070, you must define USE_INT64 as part of the compilation
command line.
sim/ scp.h
sim_console.h
sim_defs.h
sim_fio.h
sim_rev.h
sim_sock.h
sim_tape.h
sim_timer.h
sim_tmxr.h
scp.c
sim_console.c
sim_fio.c
sim_sock.c
sim_tape.c
sim_timer.c
sim_tmxr.c
sim/i7090/ i7070_defs.h
i7070_cpu.c 7070 CPU, Channel, interface
i7070_chan.c
i7070_sys.c
i7000_defs.h Generic 7000 peripherals
i7000_chan.c
i7000_chron.c
i7000_com.c
i7000_dsk.c
i7000_ht.c
i7000_mt.c
i7000_urec.c
2. IBM 7070 Features
The IBM 7070 simulator is configured as follows:
device simulates
name(s)
CPU 7070 CPU with up to 30K of memory
CH0* Unit record devices.
CH1..CH4 7604 tape channels.
CH5..CH7 7907 channels
MTA 729 magnetic tape controller, channel A (required)
MTB 729 additional magnetic tape controllers, channels B
MTC 729 additional magnetic tape controllers, channels C
MTD 729 additional magnetic tape controllers, channels D
HTA 7340 hypertape controller.
HTB 7340 additional hypertape controller.
CDR 7500 card reader
CDP 7550 card punch
LP 7400 line printer
DKn 1301/2302/7304 disk.
COM 7750 communications control
COML 7750 communications lines
Channels B through D, are mag tape channels 1,2,3,4.
Channels E through H, are 7907 channels for disk, hypertape or 7750.
The 7090 simulator implements several unique stop condition:
- undefined CPU instruction
- divide check
- select of a non-existent device
- write select of a write protected device
- invalid file control format
- invalid message to 7750
- no buffer storage available for input character on 7750
- no buffer storage available for output character on 7750
- Index not plus or minus
- Field overflow (CPU enabled).
- Sign change (CPU enabled).
2.1 CPU
The CPU options include setting memory size and cpu type.
SET CPU 7070 Sets cpu to emualte 7070.
SET CPU 7074 Sets cpu to emualte 7074.
SET CPU 5K Sets memory to 5K
SET CPU 10K Sets memory to 10K
SET CPU 15K Sets memory to 15K*
SET CPU 20K Sets memory to 20K*
SET CPU 25K Sets memory to 25K*
SET CPU 30K Sets memory to 30K*
SET CPU NOFLOAT Disables floating point.
SET CPU FLOAT Enables floating point.
SET CPU NOEXTEND Disables extended memory support.
SET CPU EXTEND Enables extended memory support.
SET CPU TIMER Enables interval timer and interupt.
SET CPU NOTIMER Disables interval timer.
Memory size is 10KW on a standard CPU, extended option must be enabled
to use memory sizes over 10KW.
CPU registers include the visible state of the processor as well as the
control registers for the interrupt system.
name size comments
IC 15 program counter
AC1 40 accumulators 1
AC2 40 accumulators 2
AC3 40 accumulators 3
SW1..SW4 1 sense switches 1..4
SW 4 sense switches
The CPU can maintain a history of the most recently executed instructions.
This is controlled by the SET CPU HISTORY and SHOW CPU HISTORY commands:
SET CPU HISTORY clear history buffer
SET CPU HISTORY=0 disable history
SET CPU HISTORY=n enable history, length = n
SHOW CPU HISTORY print CPU history
SHOW CPU HISTORY=n print first n entries of CPU history
2.2 I/O Channels (CH0..CH8)
The 7070 supports up to 8 channels. Channel models include
7604 standard multiplexor channel
7907 advanced capabilities channel
Channels are fixed on the 7070.
Channel 0 is a puesdo channel for unit record devices.
Channels have the following registers:
name type size comments
ADDR all 16 channel data address.
CMD all 8 channel command.
LIMIT all 15 channel word count.
ASM all 40 current channel assembly register.
LOCATION all 16 channel location counter.
FLAGS all 32 channel device status.
For meaning of bits in FLAGS see i7000_defs.h.
2.3 Unit record devices.
2.3.1 7900 Inquiry Station (INQ)
The console is set up as inquiry station 1. Press escape to initiate a
priorty interupt request. Pressing escape again will cancel request.
2.3.2 7500 Card Reader (CDR)
The card reader (CDR) reads data from a disk file. Cards are simulated
as ASCII lines with terminating newlines.
Card reader files can either be text (one character per column) or
column binary (two characters per column). The file type can be
specified with a set command:
SET CDR FORMAT=TEXT sets ascii text mode
SET CDR FORMAT=BINARY sets for binary card images.
SET CDR FORMAT=BCD sets for BCD records.
SET CDR FORMAT=CBN sets for column binary BCD records.
SET CDR FORMAT=AUTO Automaticly determines format.
SET CDR NOATTEN sets device to not signal ready status.
SET CDR ATTENA sets device to used unit A attention.
SET CDR ATTENB sets device to used unit B attention.
or in the ATTACH command:
ATT CDR <file> attaches a file
Error handling is as follows:
error processed as
not attached report error and stop
end of file out of cards
OS I/O error report error and stop
2.3.3 7550 Card Punch (CDP)
The card reader (CDP) writes data to a disk file. Cards are simulated
as ASCII lines with terminating newlines.
Card punch files can either be text (one character per column) or
column binary (two characters per column). The file type can be
specified with a set command:
SET CDP FORMAT=TEXT sets ascii text mode
SET CDP FORMAT=BINARY sets for binary card images.
SET CDP FORMAT=BCD sets for BCD records.
SET CDP FORMAT=CBN sets for column binary BCD records.
SET CDP FORMAT=AUTO Automaticly determines format.
SET CDP NOATTEN sets device to not signal ready status.
SET CDP ATTENA sets device to used unit A attention.
SET CDP ATTENB sets device to used unit B attention.
or in the ATTACH command:
ATT CDP <file> attaches a file
Error handling is as follows:
error processed as
not attached report error and stop
OS I/O error report error and stop
2.3.4 7400 Line Printer (LP)
The line printer (LP) writes data to a disk file as ASCII text with
terminating newlines. Currently set to handle standard signals to
control paper advance.
SET LP NO/ECHO Sets echoing to console of lineprinter output.
SET LP NOATTEN sets device to not signal ready status.
SET LP LINESPERPAGE=n Sets number of lines per page on printer.
SET LP ATTENA sets device to used unit A attention.
SET LP ATTENB sets device to used unit B attention.
Error handling is as follows:
error processed as
not attached report error and stop
OS I/O error report error and stop
2.4 Mass storage devices.
2.4.1 729 Magnetic Tape (MTA-D)
These come in groups of 10 units each. The controller defines which channel
the devices will be on.
Each individual tape drive support several options: MTA used as an example.
SET MTAn ONLINE Sets the mag tape drive online.
SET MTAn OFFLINE Sets the mag tape drive offline and not ready.
SET MTAn REWIND Sets the mag tape to the load point.
SET MTAn LOCKED Sets the mag tape to be read only.
SET MTAn WRITEENABLE Sets the mag tape to be writeable.
SET MTAn LOW Sets mag tape to low density.
SET MTAn HIGH Sets mag tape to high density.
Options: Density LOW/HIGH does not change format of how tapes are written. And
is only for informational purposes only. Tapes can only be attached to
channels 1 through 4.
Channel 1 support the read binary opcode to load binary tapes in octal format.
2.4.2 ChronoClock.
Disabled by default. This is a special 729 tape drive which returns the
current time. It supports the option of setting the channel and drive
that it will occupy. Note: You must disable the real 729 drive that is
is replacing.
SET CHRON CHAN=n Set channel for chrono clock.
SET CHRON UNIT=n Sets the unit for the chrono clock.
Example: To set Chronoclock to unit A9 do the following:
SET MTA9 DISABLE
SET CHRON UNIT=9 CHAN=A
2.5 7907 Devices
These devices must be attached to a 7907 channel to work.
2.5.1 1301/1302/2302/7320 Disk devices
The 7631 file control supports up to ten devices, which can be 7320
drums, 1301 disks, 1302 disks, or 2302 disks. Unit types are specified
with the SET command.
SET DKn TYPE=7320 unit n is a drum
SET DKn TYPE=7320-2 unit n is a drum (two modules).
SET DKn TYPE=1301 unit n is a 1301 disk
SET DKn TYPE=130l-2 unit n is a 1301-2 disk (two modules).
SET DKn TYPE=1302 unit n is a 1302 disk
SET DKn TYPE=1302-2 unit n is a 1302-2 disk (two modules).
SET DKn TYPE=2302 unit n is a 2302 disk
Units can be SET ENABLED or DISABLED. In addition, units can be
set to enable or disable formatting:
SET DKn FORMAT enable formatting
SET DKn NOFORMAT disable formatting
SET DKn HA2 enable writing of home address 2
SET DKn NOHA2 disable writing of home address 2
SET DKn MODULE=n sets modules for unit, modules
can only be even. 0 to 8.
SET DKn CHAN=n sets channel for unit (A-D).
SET DKn SELECT=n sets select on channel (0 or 1).
Formatting is disabled by default.
Error handling is as follows:
error processed as
not attached report error and stop
OS I/O error report error and stop
2.5.2 Hypertape 7340 Tape drive (HTA/B)
These come in groups of 10 units each. The controller defines which channel
the devices will be on.
SET HTx CHAN=n Set magtape to channel n. x = A|B.
SET HTx SELECT=n Sets the selection mode for the channel.
Each individual tape drive support several options: HTA used as an example.
SET MTAn LOCKED Sets the mag tape to be read only.
SET MTAn WRITEENABLE Sets the mag tape to be writeable.
2.5.3 7750 Communications Controller (COM and COML)
The 7750 is modelled as a terminal multiplexor with 33 lines. It consists
of two device: COM is the multiplexor controller, and COML is the indivdual
lines. For the first 32 lines, the 7750 performs input and output through
Telnet sessions connected via a user-specified listening port. The ATTACH command
specifies the port to be used for Telnet sessions:
ATTACH COM <port> set up listening port
where port is a decimal number between 1 and 65535 that is not being used
for other TCP/IP activities.
Each line (each unit of COML) can be set to one of twp modes: KSR-35 and
KSR-37. In KSR-35 mode, lower case input and output characters are converted
automatically to upper case, and parity is ignored. In KSR-37 mode, lower
case characters are left alone, and even parity is generated on input.
KSR-37 is the default.
Once COM is attached and the simulator is running, the 7750 listens
for connections on the specified port. It assumes that any incoming
connection is a Telnet connections. The connections remain open until
disconnected either by the Telnet client, a SET COM DISCONNECT command,
or a DETACH COM command.
The 7750 implements the following special SHOW commands
SHOW COM CONNECTIONS displays current connections to the 7750
SHOW COM STATISTICS displays statistics for active connections
The 7750 implements the following special SET commands:
SET COM DISCONNECT=n disconnect line n
SET COMLn LOG=filename log output of line n to filename
SET COMLn NOLOG disable logging and close log file
SET COMLn KSR35 set line n to KSR-35
SET COMLn KSR37 set line n to KSR-37
SET COMLn 2741 set line n to 2741
SET COM CHAN=n set channel for com controller.
The controller (COM) implements these registers:
name size comments
ENABLE 1 enable flag
STATE 6 controller state
MSGNUM 12 input message sequence number
2.6 Symbolic Display and Input
The IBM 7070 simulator implements symbolic display and input. Display is
controlled by command line switches:
-c display as BCD character
-m display instruction mnemonics
Input parsing is controlled by the first character typed in or by command
line switches:
-c BCD character
-m alphabetic instruction mnemonic
numeric decimal number.
Instruction input uses standard 7070 assembler syntax.

465
I7000/i7080_doc.txt
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@ -1,465 +0,0 @@
To: Users
From: Richard Cornwell
Subj: IBM 7080 Simulator Usage
Date: 01-May-2007
COPYRIGHT NOTICE
The following copyright notice applies to both the SIMH source and binary:
Original code published in 1993-2007, written by Robert M Supnik
Copyright (c) 1993-2007, Robert M Supnik
IBM 7080 simulator written by Richard Cornwell
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the "Software"),
to deal in the Software without restriction, including without limitation
the rights to use, copy, modify, merge, publish, distribute, sublicense,
and/or sell copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
ROBERT M SUPNIK OR RICHARD CORNWELL BE LIABLE FOR ANY CLAIM, DAMAGES OR
OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.
Except as contained in this notice, the name of Robert M Supnik or Richard
Cornwell shall not be used in advertising or otherwise to promote the sale,
use or other dealings in this Software without prior written authorization
from both Robert M Supnik and Richard Cornwell.
This memorandum documents the IBM 7080 simulator.
1. Simulator Files
sim/ scp.h
sim_console.h
sim_defs.h
sim_fio.h
sim_rev.h
sim_sock.h
sim_tape.h
sim_timer.h
sim_tmxr.h
scp.c
sim_console.c
sim_fio.c
sim_sock.c
sim_tape.c
sim_timer.c
sim_tmxr.c
sim/i7090/ i7080_defs.h
i7080_cpu.c 7080 CPU, Channel, interface.
i7080_chan.c
i7080_sys.c
i7080_drum.c 702/5 Drum
i7000_defs.h Generic 7000 peripherals
i7000_chan.c
i7000_chron.c
i7000_com.c
i7000_dsk.c
i7000_ht.c
i7000_mt.c
i7000_urec.c
2. IBM 7080 Features
The IBM 7080 simulator is configured as follows:
device simulates
name(s)
CPU 7080 CPU with up to 30K of memory
CH0* 700 devices.
CH1..CH4 754/7621 tape channels.
CH5..CH7 7908 channels
MTA 729 magnetic tape controller, channel 20
MTB 729 magnetic tape controller, channel 21
MTC 729 magnetic tape controller, channel 22
MTD 729 magnetic tape controller, channel 23
HTA 7340 hypertape controller.
CDR 711 card reader
CDP 721 card punch
LP 716 line printer
DR 733 drum for 702/705
DKn 1301/2302/7304 disk.
COM 7750 communications control
COML 7750 communications lines
Channels B through D, are mag tape channels 1,2,3,4.
Channels E & F, are 7908 channels for disk, hypertape or 7750.
The 7080 simulator implements several unique stop condition:
- undefined CPU instruction
- undefined channel instruction
- XEC nesting exceeds limit
- divide check on a divide and halt instruction
- select of a non-existent channel
- 7607 select of a 7909 channel
- write select of a write protected device
- invalid file control format
- invalid message to 7750
- no buffer storage available for input character on 7750
- no buffer storage available for output character on 7750
The LOAD command will load a card binary image file into memory.
2.1 CPU
The CPU options include setting memory size and cpu type.
SET CPU 702 Sets cpu to emualte 702.
SET CPU 705 Sets cpu to emualte 705-I/II.
SET CPU 7053 Sets cpu to emualte 705-III.
SET CPU 7080 Sets cpu to emualte 7080.
SET CPU 10K Sets memory to 10K
SET CPU 20K Sets memory to 20K
SET CPU 40K Sets memory to 40K
SET CPU 80K Sets memory to 80K
SET CPU 120K Sets memory to 120K
SET CPU 160K Sets memory to 160K
SET CPU NO/EMU40K Sets emulated memory limit to 40k
SET CPU EMU705 Sets cpu to emulate a 705-I/II.
SET CPU EMU7053 Sets cpu to emulate a 705-III.
SET CPU PROGRAM Sets cpu to programable stop mode.
SET CPU NONSTOP Sets cpu to Non-stop mode.
The 702 can support only 10k of memory. All 705's modes can support up to
40K of memory. The 7080 can support up to 160k of memory. When in 7080 mode
the machine starts as either a 705-I/II or a 705-III depending on mode
of EMU705/EMU7053 switch. Also the EMU40K fixes the maximum memory for the
7080 to 40K until it enters 80 mode with EEM instruction.
CPU registers include the visible state of the processor as well as the
control registers for the interrupt system.
name size comments
IC 20 program counter
A 256 accumulators 1
SW911..SW916 1 sense switches 911..916
SW 6 sense switches
STOP 6 Stop flags
STOPx 1 stop flags 900-905
If CPU set to PROGRAM and the stop flag is set to 1, and a 90x trigger is
generated, the machine will stop. If flag is set to 0, no stop will occur.
If CPU set to NONSTOP all errors must be checked by program.
The CPU can maintain a history of the most recently executed instructions.
This is controlled by the SET CPU HISTORY and SHOW CPU HISTORY commands:
SET CPU HISTORY clear history buffer
SET CPU HISTORY=0 disable history
SET CPU HISTORY=n enable history, length = n
SHOW CPU HISTORY print CPU history
SHOW CPU HISTORY=n print first n entries of CPU history
2.2 I/O Channels (CH0..CH6)
The 7080 supports up to 10 channels. Channel 0 is for unit record devices.
Channels 1 through 4 are for tape drives. These support the option of
SET CHn UREC tapes are on unit record device.
SET CHn 7261 tapes are on Data Synchronizer.
SET CHn 754 tapes are standard 705 drives.
Channels 5-10 are for 7908 devices. For CPU channels are defined as:
Channel CPU address
0 0-1999
20 2000 or 0200
21 2100 or 0210
22 2200 or 0220
23 2300 or 0230
40 4000 7908 high speed channel.
41 4100 7908 high speed channel.
44 4400 7908 channel.
45 4500 7908 channel.
46 4600 7908 channel.
47 4700 7908 channel.
Channels have the following registers:
name type size comments
ADDR all 20 channel data address.
CMD all 8 channel command.
ASM all 32 current channel assembly register.
FLAGS all 32 channel device status.
For meaning of bits in FLAGS see i7000_defs.h.
2.3 Unit record devices.
2.3.1 711 Card Reader (CDR)
The card reader (CDR) reads data from a disk file. Cards are simulated
as ASCII lines with terminating newlines.
Card reader files can either be text (one character per column) or
column binary (two characters per column). The file type can be
specified with a set command:
SET CDR TEXT set text mode
SET CDR BINARY set column binary mode
SET CDR AUTO sets auto detect binary/text data.
or in the ATTACH command:
ATT CDR <file> attaches a file
The card reader can be booted with the:
BOOT CDR loads either the first 2 words or
3 words depending on channel.
Error handling is as follows:
error processed as
not attached report error and stop
end of file out of cards
OS I/O error report error and stop
2.3.2 721 Card Punch (CDP)
The card reader (CDP) writes data to a disk file. Cards are simulated
as ASCII lines with terminating newlines.
Card punch files can either be text (one character per column) or
column binary (two characters per column). The file type can be
specified with a set command:
SET CDP TEXT set text mode
SET CDP BINARY set column binary mode
SET CDP AUTO set auto detect binary/text data.
or in the ATTACH command:
ATT CDP <file> attaches a file
Error handling is as follows:
error processed as
not attached report error and stop
OS I/O error report error and stop
2.3.3 716 Line Printer (LP)
The line printer (LP) writes data to a disk file as ASCII text with
terminating newlines. Currently set to handle standard signals to
control paper advance.
SET LP NO/ECHO Sets echoing to console of lineprinter output.
Error handling is as follows:
error processed as
not attached report error and stop
OS I/O error report error and stop
2.3.4 729 Magnetic Tape (MTA-D)
These come in groups of 10 units each. The controller defines which channel
the devices will be on.
Each individual tape drive support several options: MTA used as an example.
SET MTAn ONLINE Sets the mag tape drive online.
SET MTAn OFFLINE Sets the mag tape drive offline and not ready.
SET MTAn REWIND Sets the mag tape to the load point.
SET MTAn LOCKED Sets the mag tape to be read only.
SET MTAn WRITEENABLE Sets the mag tape to be writeable.
SET MTAn LOW Sets mag tape to low density.
SET MTAn HIGH Sets mag tape to high density.
Options: Density LOW/HIGH does not change format of how tapes are written. And
is only for informational purposes only.
Tape drives can be booted with:
BOOT MTAn
2.3.4 ChronoClock.
Disabled by default. This is a special 729 tape drive which returns the
current time. It supports the option of setting the channel and drive
that it will occupy. Note: You must disable the real 729 drive that is
is replacing.
SET CHRON CHAN=n Set channel for chrono clock.
SET CHRON UNIT=n Sets the unit for the chrono clock.
Example: To set Chronoclock to unit A9 do the following:
SET MTA9 DISABLE
SET CHRON UNIT=9 CHAN=A
2.4 7908 Devices
These devices must be attached to a 7908 channel to work.
2.4.1 1301/1302/2302/7320 Disk devices
The 7631 file control supports up to ten devices, which can be 7320
drums, 1301 disks, 1302 disks, or 2302 disks. Unit types are specified
with the SET command.
SET DKn TYPE=7320 unit n is a drum
SET DKn TYPE=7320-2 unit n is a drum (two modules).
SET DKn TYPE=1301 unit n is a 1301 disk
SET DKn TYPE=130l-2 unit n is a 1301-2 disk (two modules).
SET DKn TYPE=1302 unit n is a 1302 disk
SET DKn TYPE=1302-2 unit n is a 1302-2 disk (two modules).
SET DKn TYPE=2302 unit n is a 2302 disk
Units can be SET ENABLED or DISABLED. In addition, units can be
set to enable or disable formatting:
SET DKn FORMAT enable formatting
SET DKn NOFORMAT disable formatting
SET DKn HA2 enable writing of home address 2
SET DKn NOHA2 disable writing of home address 2
SET DKn MODULE=n sets modules for unit, modules
can only be even. 0 to 8.
SET DKn CHAN=n sets channel for unit (40-47).
Formatting is disabled by default.
All Disk units support bootsrapping with boot command. Bootstrap code
is build based on whether CPU is in CTSS mode or not.
BOOT DKn
Error handling is as follows:
error processed as
not attached report error and stop
OS I/O error report error and stop
2.4.2 Hypertape 7340 Tape drive (HTA/B)
These come in groups of 10 units each. The controller defines which channel
the devices will be on.
SET HTx CHAN=n Set magtape to channel n. x = 40-47
Each individual tape drive support several options: HTA used as an example.
SET HTAn LOCKED Sets the mag tape to be read only.
SET HTAn WRITEENABLE Sets the mag tape to be writeable.
NOTE: Hypertape drives may not be working correctly since there is
very little documentation available on them.
Hypertape drives can be booted with:
BOOT HTxn
2.4.3 7750 Communications Controller (COM and COML)
The 7750 is modelled as a terminal multiplexor with 33 lines. It consists
of two device: COM is the multiplexor controller, and COML is the indivdual
lines. For the first 32 lines, the 7750 performs input and output through
Telnet sessions connected via a user-specified listening port. The ATTACH command
specifies the port to be used for Telnet sessions:
ATTACH COM <port> set up listening port
where port is a decimal number between 1 and 65535 that is not being used
for other TCP/IP activities.
Each line (each unit of COML) can be set to one of twp modes: KSR-35 and
KSR-37. In KSR-35 mode, lower case input and output characters are converted
automatically to upper case, and parity is ignored. In KSR-37 mode, lower
case characters are left alone, and even parity is generated on input.
KSR-37 is the default.
Once COM is attached and the simulator is running, the 7750 listens
for connections on the specified port. It assumes that any incoming
connection is a Telnet connections. The connections remain open until
disconnected either by the Telnet client, a SET COM DISCONNECT command,
or a DETACH COM command.
The 7750 implements the following special SHOW commands
SHOW COM CONNECTIONS displays current connections to the 7750
SHOW COM STATISTICS displays statistics for active connections
The 7750 implements the following special SET commands:
SET COM DISCONNECT=n disconnect line n
SET COMLn LOG=filename log output of line n to filename
SET COMLn NOLOG disable logging and close log file
SET COMLn KSR35 set line n to KSR-35
SET COMLn KSR37 set line n to KSR-37
SET COMLn 2741 set line n to 2741
SET COM CHAN=n set channel for com controller.
The controller (COM) implements these registers:
name size comments
ENABLE 1 enable flag
STATE 6 controller state
MSGNUM 12 input message sequence number
2.6 Symbolic Display and Input
The IBM 7080 simulator implements symbolic display and input. Display is
controlled by command line switches:
-c display as BCD character
-m display instruction mnemonics
Input parsing is controlled by the first character typed in or by command
line switches:
' or -c BCD character
" or -s BCD string
alphabetic instruction mnemonic
numeric octal number
Instruction input uses standard 7090 assembler syntax. There are two
basic instruction classes: memory reference and index reference.
Memory reference instructions have the format
memref{*} address{,tag}
Index reference instructions have the format
idxref{*} address,{tag},decrement
Specific instructions may disallow indirect addressing or limit the
size of the tag, address, or decrement fields.
Channel (I/O) instructions have the same basic two formats.
2.7 Sim Load
The load command looks at the extension of the file to determine how to
load the file.
.dck Loads autocode loader deck.
.sym Loads a 7080 symbolic deck.
address instruction.
address BCD string
address OCT octal, octal,....

589
I7000/i7090_doc.txt
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@ -1,589 +0,0 @@
To: Users
From: Richard Cornwell
Subj: IBM 7090 Simulator Usage
Date: 01-Dec-2005
COPYRIGHT NOTICE
The following copyright notice applies to both the SIMH source and binary:
Original code published in 1993-2005, written by Robert M Supnik
Copyright (c) 1993-20054, Robert M Supnik
IBM 7090 simulator written by Richard Cornwell
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the "Software"),
to deal in the Software without restriction, including without limitation
the rights to use, copy, modify, merge, publish, distribute, sublicense,
and/or sell copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
ROBERT M SUPNIK OR RICHARD CORNWELL BE LIABLE FOR ANY CLAIM, DAMAGES OR
OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.
Except as contained in this notice, the name of Robert M Supnik or Richard
Cornwell shall not be used in advertising or otherwise to promote the sale,
use or other dealings in this Software without prior written authorization
from both Robert M Supnik and Richard Cornwell.
This memorandum documents the IBM 7090 simulator.
1. Simulator Files
To compile the IBM 7090, you must define USE_INT64 as part of the compilation
command line.
sim/ scp.h
sim_console.h
sim_defs.h
sim_fio.h
sim_rev.h
sim_sock.h
sim_tape.h
sim_timer.h
sim_tmxr.h
scp.c
sim_console.c
sim_fio.c
sim_sock.c
sim_tape.c
sim_timer.c
sim_tmxr.c
sim/i7090/ i7090_defs.h
i7090_cpu.c CPU, channel, interface
i7090_chan.c
i7090_sys.c
i7090_cdr.c 7090 Specific peripherals
i7090_cdp.c
i7090_drum.c
i7090_lpr.c
i7090_hdrum.c CTSS drum
i7000_defs.h Generic 7000 peripherals
i7000_chan.c
i7000_chron.c
i7000_com.c
i7000_dsk.c
i7000_mt.c
i7000_ht.c
2. IBM 7090 Features
The IBM 7090 simulator is configured as follows:
device simulates
name(s)
CPU 7090 CPU with 32KW/64KW of memory
CLK interval timer (RPQ F89349) and Chronolog clock
CH0* 704 devices.
CH1 7607 channel (required)
CH2..CH7 additional 7607, 7289, or 7909 channels
MTA 729 magnetic tape controller, channel A (required)
MTB 729 additional magnetic tape controllers, channels B
MTC 729 additional magnetic tape controllers, channels C
MT 729 additional magnetic tape controllers, 704 devices
HTA 7340 hypertape controller.
HTB 7340 additional hypertape controller.
CDRn 711 card reader
CDPn 721 card punch
LPn 716 line printer
DR0 733 drum
HDn 7289 fast drum control
DKn 1301/2302/7304 disk.
COM 7750 communications control
COML 7750 communications lines
Channels B through H, the corresponding magnetic tape controllers, and
the file control, drum control , and communications control are initially
set DISABLED. The file control, drum control, and communications control
can be assigned to any channel in the range B through H.
The 7090 simulator implements several unique stop condition:
- undefined CPU instruction
- undefined channel instruction
- XEC nesting exceeds limit
- divide check on a divide and halt instruction
- select of a non-existent channel
- 7607 select of a 7909 channel
- write select of a write protected device
- invalid file control format
- invalid message to 7750
- no buffer storage available for input character on 7750
- no buffer storage available for output character on 7750
The LOAD command will load a card binary image file into memory.
2.1 CPU
The CPU options include setting memory size and cpu type. Also the special
features required for used by the CTSS project:
SET CPU STANDARD Standard CPU
SET CPU CTSS CTSS CPU
SET CPU 704 Sets cpu to emulate a 704
SET CPU 709 Sets cpu to emulate 709 instructions
SET CPU 7090 Sets cpu to emualte 7090.
SET CPU 7094 Sets cpu to emualte 7094.
SET CPU 4K Sets memory to 4K
SET CPU 8K Sets memory to 8K
SET CPU 16K Sets memory to 16K
SET CPU 32K Sets memory to 32K
SET CPU TRUEIO CPU executes I/O in cpu time.
SET CPU FASTIO CPU detects I/O waits and shortens them
SET CPU NOEFP Disables extended presicion floating point.
SET CPU EFP Enables extended presicion floating point.
SET CPU NOFPSM Disables floating point signifigance mode.
SET CPU FPSM Enables floating point signifigance mode.
SET CPU TIMER Enables interval timer and interupt.
SET CPU NOTIMER Disables interval timer.
Memory size is 32KW on a standard CPU, 64KW on a CTSS CPU. Set notes below
on seting up for CTSS.
CPU registers include the visible state of the processor as well as the
control registers for the interrupt system.
name size comments
IC 15 program counter
AC 38 accumulator
MQ 36 multiplier-quotient
ID 36 storage indicators
KEYS 36 front panel keys
XR1..XR7 15 index registers 1..7
SW1..SW6 1 sense switches 1..6
SW 6 sense switches
SL1..4 1 sense lights 1..4
ACOVF 1 AC overflow indicator
MQOVF 1 MQ overflow indicator
DVC 1 divide check indicator
IOC 1 I/O check indicator
TM 1 transfer trap enable
CTM 1 copy trap enable
STM 1 select trap enable
FTM 1 floating point trap enable
NMODE 1 storage nullification mode enable
MTM 1 multiple-tag mode enable
ENB 36 contents of interrupt enable register
INST_BASE 1 (CTSS) instruction B-core flag
DATA_BASE 1 (CTSS) data B-core flag
BASE 14 (CTSS) relocation base block
LIMIT 14 (CTSS) address limit block
The CPU can maintain a history of the most recently executed instructions.
This is controlled by the SET CPU HISTORY and SHOW CPU HISTORY commands:
SET CPU HISTORY clear history buffer
SET CPU HISTORY=0 disable history
SET CPU HISTORY=n enable history, length = n
SHOW CPU HISTORY print CPU history
SHOW CPU HISTORY=n print first n entries of CPU history
2.2 I/O Channels (CH0..CH8)
The 7090 supports up to 8 channels. Channel models include
7607 standard multiplexor channel
7289 high speed drum channel
7909 advanced capabilities channel
Channel A is required and is always a 7607. Channel are represented by
a number: A=1, B=2, C=3, D=4, E=5, F=6, G=7, H=8.
SET CHn 7607 Sets channel to be a 7607 type.
SET CHn 7909 Sets channel to be a 7909 type.
SET CHn 7289 Sets channel to be a 7289 type. (For CTSS Drum).
SET CHn FIXED Fixes channel to specific type.
SET CHn AUTO Defualt, channel configures based on devices on it.
Generally there is no need to worry about channel configurations, in
auto mode they will configure to correct type to support devices attached
to them. Or you will get an error when you attempt to run the simulation
if there is a conflict.
Channel 0 is a puesdo channel for 704 devices. Currently unit CR3, CP3, LP3,
DR0, and MTD are set to this device.
Channels have the following registers:
name type size comments
ADDR all 16 channel data address.
CMD all 6 channel command. (S/1/2/3 & 18/19)
WC all 15 channel word count.
ASM all 36 current channel assembly register.
LOCATION all 16 channel location counter.
STATUS all 16 channel device status.
SENSE 7909 16 additional device controls.
COUNTER 7909 6 channel counter.
SMS 7909 7 channel SMS register.
For meaning of bits in STATUS and SENSE see i7090_defs.h.
2.3 Channel 7607 Devices and 704 devices.
2.3.1 711 Card Reader (CDR)
The card reader (CDR) reads data from a disk file. Cards are simulated
as ASCII lines with terminating newlines.
Card reader files can either be text (one character per column) or
column binary (two characters per column). The file type can be
specified with a set command:
SET CDRn FORMAT=TEXT sets ascii text mode
SET CDRn FORMAT=BINARY sets for binary card images.
SET CDRn FORMAT=BCD sets for BCD records.
SET CDRn FORMAT=CBN sets for column binary BCD records.
SET CDRn FORMAT=AUTO Automaticly determines format.
SET CDRn CHAN=n Sets channel to n
or in the ATTACH command:
ATT CDRn <file> attaches a file
The card reader can be booted with the:
BOOT CDRn loads either the first 2 words or
3 words depending on channel.
Error handling is as follows:
error processed as
not attached report error and stop
end of file out of cards
OS I/O error report error and stop
2.3.2 721 Card Punch (CDP)
The card reader (CDP) writes data to a disk file. Cards are simulated
as ASCII lines with terminating newlines.
Card punch files can either be text (one character per column) or
column binary (two characters per column). The file type can be
specified with a set command:
SET CDPn FORMAT=TEXT sets ascii text mode
SET CDPn FORMAT=BINARY sets for binary card images.
SET CDPn FORMAT=BCD sets for BCD records.
SET CDPn FORMAT=CBN sets for column binary BCD records.
SET CDPn FORMAT=AUTO Automaticly determines format.
SET CDPn CHAN=n Sets channel to n
or in the ATTACH command:
ATT CDPn <file> attaches a file
Error handling is as follows:
error processed as
not attached report error and stop
OS I/O error report error and stop
2.3.3 716 Line Printer (LP)
The line printer (LP) writes data to a disk file as ASCII text with
terminating newlines. Currently set to handle standard signals to
control paper advance.
SET LPn NO/ECHO Sets echoing to console of lineprinter output.
SET LPn CHAN=n sets channel for this device
Error handling is as follows:
error processed as
not attached report error and stop
OS I/O error report error and stop
The Printer supports the following SPRA n selection pulses for controlling
spacing (spacing occurs before the line is printed):
SPRA 2 Single space.
SPRA 1 To top of form.
SPRA 3 Double space.
SPRA 4 Triple space.
SPRA 9 Suppress linefeed after print.
SPT Will skip if any printer line has been pulsed.
Defualt with no SPRA is to single space before printing.
2.3.4 729 Magnetic Tape (MTA-D)
These come in groups of 10 units each. The controller defines which channel
the devices will be on.
SET MTx CHAN=n Set magtape to channel n. x = A|B|C|<nothing>.
Each individual tape drive support several options: MTA used as an example.
SET MTAn ONLINE Sets the mag tape drive online.
SET MTAn OFFLINE Sets the mag tape drive offline and not ready.
SET MTAn REWIND Sets the mag tape to the load point.
SET MTAn LOCKED Sets the mag tape to be read only.
SET MTAn WRITEENABLE Sets the mag tape to be writeable.
SET MTAn LOW Sets mag tape to low density.
SET MTAn HIGH Sets mag tape to high density.
Options: Density LOW/HIGH does not change format of how tapes are written. And
is only for informational purposes only.
Online/Offline is part of a optional RPQ for the 7090 which adds the DRS/TRS
instructions.
DRS drive Will set drive to offline after current command is
finished. Drive is not unloaded and can be reenabled
by setting it online.
TRS drive Tests to see if the drive is online. If the drive
is there and online it will skip the next instruction
otherwise it takes the next instruction.
These instructions were put in since accessing a unloaded tape drive would
hang the CPU.
Tape drives can be booted with:
BOOT MTxn
2.3.4 ChronoClock.
Disabled by default. This is a special 729 tape drive which returns the
current time. It supports the option of setting the channel and drive
that it will occupy. Note: You must disable the real 729 drive that is
is replacing.
SET CHRON CHAN=n Set channel for chrono clock.
SET CHRON UNIT=n Sets the unit for the chrono clock.
Example: To set Chronoclock to unit A9 do the following:
SET MTA9 DISABLE
SET CHRON UNIT=9 CHAN=A
2.3.5 733 Drum (DR)
This is the drum for 704/709 and possible 7090. Up to 16 units can
be attached to the CPU, all are on puesdo channel 0. Each drum is
2048K words in size. They are all stored in one file.
SET DR0 UNITS=n
Drum unit 0 can be booted with:
BOOT DR0
Drum unit can be assigned to a 7607 channel, but this is unsupported
by the operating systems. Drum channel is changed with:
SET DR0 CHAN=n where n is '*' or A-H. Channel '*' is
the default which is the 704 psuedo channel.
2.4 7909 Devices
These devices must be attached to a 7909 channel to work.
2.4.1 1301/1302/2302/7320 Disk devices
The 7631 file control supports up to ten devices, which can be 7320
drums, 1301 disks, 1302 disks, or 2302 disks. Unit types are specified
with the SET command.
SET DKn TYPE=7320 unit n is a drum
SET DKn TYPE=7320-2 unit n is a drum (two modules).
SET DKn TYPE=1301 unit n is a 1301 disk
SET DKn TYPE=130l-2 unit n is a 1301-2 disk (two modules).
SET DKn TYPE=1302 unit n is a 1302 disk
SET DKn TYPE=1302-2 unit n is a 1302-2 disk (two modules).
SET DKn TYPE=2302 unit n is a 2302 disk
Units can be SET ENABLED or DISABLED. In addition, units can be
set to enable or disable formatting:
SET DKn FORMAT enable formatting
SET DKn NOFORMAT disable formatting
SET DKn HA2 enable writing of home address 2
SET DKn NOHA2 disable writing of home address 2
SET DKn MODULE=n sets modules for unit, modules
can only be even. 0 to 8.
SET DKn CHAN=n sets channel for unit (A-H).
SET DKn SELECT=n sets select on channel (0 or 1).
SET DKn CTSS sets disk to use CTSS bootstrap.
SET DKn IBSYS sets disk to use IBSYS bootstrap.
Formatting is disabled by default.
All Disk units support bootsrapping with boot command. Bootstrap code
is build based on whether CPU is in CTSS mode or not.
BOOT DKn
Error handling is as follows:
error processed as
not attached report error and stop
OS I/O error report error and stop
2.4.2 Hypertape 7340 Tape drive (HTA/B)
These come in groups of 10 units each. The controller defines which channel
the devices will be on.
SET HTx CHAN=n Set magtape to channel n. x = A|B.
SET HTx SELECT=n Sets the selection mode for the channel.
Each individual tape drive support several options: HTA used as an example.
SET MTAn LOCKED Sets the mag tape to be read only.
SET MTAn WRITEENABLE Sets the mag tape to be writeable.
NOTE: Hypertape drives may not be working correctly since there is
very little documentation available on them.
Hypertape drives can be booted with:
BOOT HTxn
2.4.3 7750 Communications Controller (COM and COML)
The 7750 is modelled as a terminal multiplexor with 33 lines. It consists
of two device: COM is the multiplexor controller, and COML is the indivdual
lines. For the first 32 lines, the 7750 performs input and output through
Telnet sessions connected via a user-specified listening port; the 33rd line
is permanently attached to the simulator console window. The ATTACH command
specifies the port to be used for Telnet sessions:
ATTACH COM <port> set up listening port
where port is a decimal number between 1 and 65535 that is not being used
for other TCP/IP activities.
Each line (each unit of COML) can be set to one of twp modes: KSR-35 and
KSR-37. In KSR-35 mode, lower case input and output characters are converted
automatically to upper case, and parity is ignored. In KSR-37 mode, lower
case characters are left alone, and even parity is generated on input.
KSR-37 is the default.
Once COM is attached and the simulator is running, the 7750 listens
for connections on the specified port. It assumes that any incoming
connection is a Telnet connections. The connections remain open until
disconnected either by the Telnet client, a SET COM DISCONNECT command,
or a DETACH COM command.
The 7750 implements the following special SHOW commands
SHOW COM CONNECTIONS displays current connections to the 7750
SHOW COM STATISTICS displays statistics for active connections
The 7750 implements the following special SET commands:
SET COM DISCONNECT=n disconnect line n
SET COMLn LOG=filename log output of line n to filename
SET COMLn NOLOG disable logging and close log file
SET COMLn KSR35 set line n to KSR-35
SET COMLn KSR37 set line n to KSR-37
SET COMLn 2741 set line n to 2741
SET COM CHAN=n set channel for com controller.
The controller (COM) implements these registers:
name size comments
ENABLE 1 enable flag
STATE 6 controller state
MSGNUM 12 input message sequence number
2.5 7289 High-Speed Drum (HD)
The 7289 (also known as the 7320A) high-speed drum was a late
addition to CTSS. Very little is known about the device, other
than what is used in the CTSS sources.
The drum can be changed to different channels with the
SET HD0 CHAN=n where n is A-H. The channel must be configured
as a 7289 type channel. Otherwise the drum will
not work.
SET HD0 UNITS=n Sets the number of 256K drums on the unit.
Error handling is as follows:
error processed as
not attached report error and stop
Drum data files are buffered in memory; therefore, end of file and OS
I/O errors cannot occur.
2.6 Symbolic Display and Input
The IBM 7090 simulator implements symbolic display and input. Display is
controlled by command line switches:
-c display as BCD character
-m display instruction mnemonics
-l display as lisp pointer.
Input parsing is controlled by the first character typed in or by command
line switches:
' or -c BCD character
" or -s BCD string
alphabetic instruction mnemonic
numeric octal number
Instruction input uses standard 7090 assembler syntax. There are two
basic instruction classes: memory reference and index reference.
Memory reference instructions have the format
memref{*} address{,tag}
Index reference instructions have the format
idxref{*} address,{tag},decrement
Specific instructions may disallow indirect addressing or limit the
size of the tag, address, or decrement fields.
Channel (I/O) instructions have the same basic two formats.
2.7 Sim Load
The load command looks at the extension of the file to determine how to
load the file.
.crd Loads a card image file into memory.
standard 709 format + 1 card loader.
.oct Loads an octal deck:
address <blank> octal <blank> octal...
.sym Loads a 709 symbolic deck.
address instruction.
address BCD string
address OCT octal, octal,....