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HISTORY.DOC Summary PC/370 Release History
MMS/370 R1.0 12/28/81 first beta test demo for Z80 CP/M-80
Successful demo program assembly, link, and execute
completed on the following systems:
1. Radio Shack Model II with Lifeboat CP/M v2.2.
2. Cromemco system with Tarbell CP/M v1.4.
MMS/370 R1.1 01/04/82 first Distributor evaluation version
sent to Lifeboat Assoc. for evaluation
MMS/370 R1.2 12/20/82 second beta test
MMS/370 R1.3 02/12/83 first user release
A370
1. Add XREAD, XPRNT, XDECI, XDECO, XFILI, XFILO, XDUMP
2. Fix location 0 overlay processing missing END.
3. Force E22 length error for 0 length program.
L370
1. Force E08 memory error for 0 length segment.
2. Fix incorrect SEARCH return code due to DEQ.
3. Fix ORG error at end if no literals.
4. Fix bad stack address at program entry with option G.
5. Fix object code error when control Z is first byte of
physical block in concatenated object file.
6. Allow alternate disk drive A for L370.LIB if not found
on specified drive for object file.
E370
1. Add ASSIST support plus interactive debug log option.
2. Add 370 instruction trace and instruction address stop.
3. Add 370 address protection for CP/M and E370 areas.
MMS/370 R2.2 05/04/83 second user release with new XA extensions
A370
1. 27 new instructions added including BAS, BASR, MVCIN,
BSM, and BASSM.
2. Fix made to handle explicit 256 byte SS instructions
correctly.
3. Fix DC logic to surpress duplicate references to *.
4. FIX SVC interface to save IX and IY for NEC PC MSDOS.
L370
1. Fix stack pointer for execution for option G to prevent
initial call from storing address in program area. Also
changed call in prefix to simple jump to emulator entry.
E370
1. 5 new non-privileged instructions supported along with
PSW address mode bit 17.
2. The existing instructions LA, BAL, BALR, EDMK, and TRT
all have been modified to function correctly in both
24 and 31 bit addressing modes.
3. Fix incorrect instruction length code in BAL 24 bit
mode .
4. Fix incorrect EDMK address for single byte PD fields.
5. Fix incorrect SS instruction processing when length is
over 128.
6. Fix fixed point multiply and divided overflow when
result is negative.
7. Fix sign of remainder for fixed and packed divide.
8. Fix packed decimal compare for negative zero.
9. Fix condition codes for multiply and divide exceptions.
10. Fix Assist XREAD to correctly support 1 byte area.
11. Fix arithmetic shift left overflow logic.
12. Fix packed decimal divide to correctly detect overflow.
MMS/370 R2.3 06/30/83 third user release with updated XA
extensions
A370
1. Add IPM and other new XA supervisor instructions
L370
E370
1. Add IPM instruction
2. Change XA mode PSW bit to 32 and display extended mode PSW
when in XA mode.
3. Correct BSM logic to skip save when first register is 0.
4. Add option to update 370 registers to MMDBUG command Y.
5. Reduce size of E370 by 500 bytes by changing logic macros
to common subroutines for logical RR and RX instructions.
MMS/370 R3.1 03/08/84 maintenance release with corrections
A370
1. Fix error created by V type address constant referencing
CSECT defined later in same assembly.
2. Fix length attribute of CSECT/DSECT to always be 1.
L370
E370
1. Fix error in XR and X exclusive OR logic introduced in R2.3
when logic was combined in 1 routine to save memory.
2. Fix DP overflow logic to cause divide exception 0CB instead
of divide overflow. Note divide exception cannot be masked
like overflow but SPIE can be used to handle it.
3. Check for interrupt every 256 instructions even in kill
mode.
4. Only trace IFL entries in 370 mode for N command.
5. Fix NODBUG minimum storage replacement module for MMDBUG to
correctly NOP 370 TRACE calls.
PC/370 R1.0 06/08/85 first freeware release for 8086 MSDOS systems
A370
L370
1. Force option F to always dynamically load E370.EXE. The
emulator can no longer be linked with 370 code since L370
does not process native 8086 assembler object code format.
E370
1. Add SVC's 17-22 to handle extended MSDOS functions such as
time.
PC/370 R1.1 11/11/85 maintenance release
A370
1. Allow lower case command line.
2. Fix error for zero length data in DC for alignment.
L370
1. Allow lower case command line.
E370
1. Allow lower case debug command entry.
2. Initialize register 13 to standard save area.
3. Support 370 instruction address reset via J command.
4. Only stop at IFL trace in 370 address stop mode.
5. Attempt to close all files when exiting via <esc> command.
DOC
1. Add documentation files describing trace id points.
PC/370 R1.2 07/18/86 maintenance release plus SEE editor utility
A370
1. Drop form feed on first page heading.
2. Translate lower case ASCII comments to upper case.
3. Align column headings for cross reference and repeat
headings.
4. Fix error when DC F coded without data - now issues error.
5. Rearrange opening of files in pass 2 to insure that no more
memory is required in pass 2 than in pass 1. This allows
number of symbols to directly determine maximum assembly
possible (SEE is within 30 symbols of maximum now). Note
debug was removed from A370 (8k) to provide more symbol
space. Also note in pass 2, ALC file buffer will be smaller
to provide room for object and print file buffers if
necessary to not exceed pass 1 memory usage.
6. Tighten TITLE syntax to require correct leading quote.
L370
1. Drop form feed on first page heading.
2. Align column headings with data lines.
3. Correct bug causing CSECT reference labels to be truncated.
E370
1. Correct bug in XDECI ASSIST instruction to correctly input
negative numbers.
2. Translate DDNAME to ASCII for SEARCH and DELETE SVC's.
3. Reverse DMAS, DMAE, BLKE addresses during OPEN/CLOSE along
with EODAD and SYNAD addresses to support user defined
buffer.
4. Change debug trace to only trace first ID after IFL in 370
mode.
5. Support trace ID's IOF and ION to turn interrupts off and
on.
6. Fix bug in IOS get text record routine which caused
premature end of file when DCB was within 128 bytes of
buffer area due to uninitialized register picking up DCB
address instead of DMA address during pending EOF
processing.
7. Fix bug in IOS random write routine to increment block
pointer when writing blocks larger than 128 bytes.
8. Change debug to not kill SVC 9 trace entries from 370 code.
9. Add SVC 23 to perform RENAME using DCB with EBCDIC names.
(See SEE.ALC for example use and IHADCB extensions.)
10. Add SVC 24 to microcode printing line of ASCII text on
screen with attribute colors. (used to more than double SEE
speed).
11. Fix memory management to not allocate from last FQE unless
there is room for a remaining smaller FQE pointer. Force
end of memory at x'FF00' to leave room for stack.
12. Support S save/unsave debug command to protect current trace
ID while running in kill mode. (very useful to obtain high
speed execution up to selected point in program).
13. Save 8086 flags in high R0 for BIOS SVC's such as KEYBOARD.
14. Add explicit EBCDIC/ASCII translation and line control
options to SVC's 0-24 via high bits of R2:
bit 0 - explicit control if on, else use option E
bit 1 - force EBCDIC translation if on, else use ASCII
bit 2 - force addition of line control, else none
(For example ICM R2,8,=X'80' would force no translation
and no line control regardless of option E setting.)
15. Fix debug N trace listing to translate SVC 9 EBCDIC Id's.
DOC
1. Add SEE.ALC source code utility to edit or browse an ASCII
text file in full screen color mode. Keystrokes are
compatible with Turbo Pascal and PFS:WRITE. The editor
supports files up to 512k. SEE includes character graphics
to support line drawings and organizational chart drawings.
SEE also supports creation of session keystroke file (.KSF)
which can be reused to recreate SEE session with full screen
colors and with keyboard pause and wait control.
2. Add PRINT.ALC source code utility to print source programs
and PC370.DOC documentation file with page control.
3. Add information on electronic bulletin board and PC-SIG
distribution via disk #402.
4. Add DW3NUM.ALC source code utility to insert line numbers on
all non-blank lines in a Displaywrite III text document.
Numbers are placed in left margin and reset at beginning of
each page. This program serves as a model for other
utilities that could be written to process Displaywrite III
document files directly. This utility squeezes file and
lists file on console in the process of inserting line
numbers.
5. Drop form feed on first page heading for PRINTDOC.ALC.
PC/370 R2.0 05/16/87 major update with 512 address space support
A370
1. Converted to EXE format with 64k data segment and buffer
segment.
2. Now supports 3 times as many labels and literals.
3. File handle I/O with pathing much more efficient.
4. Fix error if DSECT's contain anything but DS instructions.
5. Allow references to ENTRY symbols within same module.
L370
1. Converted to EXE format with 64k data segment and buffers
segment.
2. Now supports code modules up to 50k.
3. File handle I/O with pathing much more efficient.
4. New option M creates 370 MOD file without COM prefix.
E370
1. Converted to EXE format running in high 64k segment.
2. The standard instruction set plus ASSIST now supports
direct addressing up to the maximum available memory
under MS-DOS 2.0+ (512k+).
3. Error in one byte overlapped pack instruction corrected.
4. Error in BXH and BXLE with negative updated index values
fixed.
5. Memory management now supports the full address space
using 8 byte free queue elements (4 byte address and
4 byte length). ASCASF FQE chain pointer is located at
X'118'in new address space control block. The same
registers for SVC 10 and 11 are used.
6. File management support has been rewritten using MS-DOS
file handle I/O to support pathing and random or
sequential access to multiple files. Each file can
have up to 64K buffer. Maximum files open is
controlled by CONFIG.SYS FILES= parameter. See
DOC\SYSTEM.DOC and CPY\IHADCB.CPY for more information.
7. The interactive debug facility has been expanded to
provide additional support for virtual address space
separate from emulator address space. The Z command
determines which address space functions refer to. The
debug facility is included in A370 and L370 as well as
E370. A new "I" command added, dumps full word counter
which is source record count in A370, logical object record
in L370, and 370 instruction counter in E370. Address stop
on this word can be used to stop execution at any desired
point. However, note that in kill mode, the counter may be
incremented more than once between trace ids preventing
address stop on equal from triggering.
8. The interface between linked COM modules and the E370.EXE
emulator has been redesigned to use the MS-DOS standard EXEC
function instead of somewhat non-standard overlay load. Now
the first 16 bytes of each linked COM module contains the
EXEC mainline which links to E370.EXE in the high 64k of
available memory. E370.EXE initializes the virtual address
space origin 16 bytes past the beginning of the COM module
with executable code starting at X'210' into module or
relative X'200'. COM mainline will abort if there is not
room for COM module plus 64k for E370.EXE.
9. E370.EXE now supports SVC 25 to load any kind of file
including linked COM files into free memory. See
DOC\SYSTEM.DOC and CPY\IHASCB.CPY.
10. E370.EXE now supports SVC 26 an 27 for attach and detach of
COM 370 programs which run in their own relative address
spaces. See DEMO\DEMOPSW series of demo programs for
example.
11. Fix trace and PSW address of EX target instructions.
PC/370 R2.0A 05/24/87 fixes to 2.0
A370
1. EQU's preceeding first CSECT caused 0 length blank CSECT
error.
L370
E370
1. Error in Freemain svc 11 when releasing block between two
existing free blocks chained to third free block.
2. I/O supervisor now takes SYNAD exit if bad RBA causes random
read or write to fail due to pointing beyond disk capacity.
PC/370 R3.0 08/30/87 new macro preprocessor, floating point,
scientific subroutines, generic interrupt SVC, ASCII string
constants, MVS shell demo with SIO channel simulator
A370
1. Support for E, D, and L floating point constants added.
2. ASCII string constants in double quotes added and self
defining string constants fixed to handle C'''' etc.
3. Error in DS or DC destroyed location counter causing
additional erroneous base errors in following instructions.
4. Treat blank lines like comments instead of syntax errors.
L370
1. Error in concatenating object files when previous file ends
exactly on 128 block boundary.
2. Add option I to surpress all interrupts during execution.
3. Add option P to surpress floating point even if 80x87 avail.
E370
1. Floating point instructions added using 80x87.
2. SVC's 28-35 added to assist use of ASCII strings, generic
interrupt to issue any MS-DOS or BIOS interrupt with user
defined PC registers, plus scientific subroutine assist
using 80x87 routines for square root, 2**X, tangent,
arctangent, logs.
3. Fixed ASCII file output translation option (was translating
after write) in PUT svc.
4. Correct ASCII/EBCDIC translation of left bracket and GE
symbols.
5. Correct debug jump command to handle addresses over 64k in
370 mode.
6. Correct MP to return specification error if L'A LE L'B, L'B
GT 8, or high bytes of A for length L'B not zero.
PC/370 R3.1 09/02/87 maintenance to R3.0 based on user feedback
A370
1. Fix error in object code ORG when DS is used in multiple
CSECT module causing L370 link error due to ORG exceeding
length of CSECT (offset to start of non-zero CSECT was not
being subtracted to calculate relative CSECT ORG address).
Explicit ORG's worked fine, only a DS generated ORG caused
error.
L370
E370
PC/370 R3.2 09/07/87 maintenance to R3.1 based on user feedback
A370
1. Allow maximum 80 character ALC source with seq. #.
2. Fix label equated to CSECT/DSECT which caused L370 errors.
3. Flag DC error for RLD's for DSECT labels which caused L370
errors.
L370
E370
1. Fix ZAP to correct regression bug with R2.0 where any number
with zero in low nibble gives positive sign and zero
condition.
PC/370 R4.0 11/08/87 maintenance to R3.1 based on user feedback
A370
1. Add support for COPY statement to include source code from
any MS-DOS path\filename. The default suffix is CPY.
L370
1. Add option B to create file identical to COM file but with
suffix BIN for use with Micro Focus COBOL.
E370
1. Support resident option invoked by directly executing the
emulator EXE module.
2. Support calls from Micro Focus COBOL in resident mode using
standard linkage conventions and V=R addressing mode.
3. Modify OPEN logic to allow use of SYNAD exit even though
file may not be open due to error such as file not found.
Add error and function codes in R0 and R1 for use by SYNAD
exit in determining error (see LIB\SYNERROR.ALC).
PC/370 R4.1 11/20/87 maintenance to R4.0 based on user feedback
A370
1. Correct ORG to correctly handle CSECT or DSECT name as well
as any relative expression (The code was only allowing
relative expression operand rather than special label type).
L370
E370
1. Correct serious bug in release 4.0 which stores 8 byte free
queue element directly after the end of each BIN module.
(This code to build free area behind COM modules can cause
COBOL run time system to crash after exiting from
subroutine depending on use of area overlayed).
2. Add optional parameter to define size of system queue area
(SQA) memory in the resident emulator address space for use
by COBOL subroutines. Size is in hex paragraphs and default
is 10 or 256 bytes. Through use of SQA, COBOL subroutines
can now perform standard file I/O with dynamic buffer
allocation (See BAT\RUNCBL.BAT demo for example SQA and
I/O use).
3. Enhance interactive debug to support resident reusability by
restoring all traces at beginning of each COM execution and
at beginning of all COBOL subroutines called with option D
specified at link edit. Also toggle command K can be used
to restore traces at any point in program execution (This
allows quickly reaching a selected point in program and then
restoring traces for complete instruction tracing).
3. Support user defined standard COBOL return code using value
in register 15 (low 16 bits) at exit.
PC/370 R4.2 01/05/88 Micro Focus XM protected mode support
A370
L370
1. Add option U to allow undefined external references.
E370
1. Support Micro Focus XM COBOL protected mode call to PC/370
assembler subroutine in BIN file (See USER.DOC for more).
The resident interrupt was moved from hex DC to hex 60.
(See PTF.DOC for fix to change interrupt # if it conflicts.)
2. Fix 0C9 on CVB with negative zero packed decimal input.
3. Correct EBCDIC to ASCII translate tables to handle
> { and [ conversion in both directions (half fixed in 3.0).
4. Flag error for text file with LRECL<2.
5. Fix SRP to use only low 6 bits in second operand for shift.
(If the 6 bit number was positive, 8 bits were used.)
6. MVS standard parm list with address, half word count, and
EBCDIC parm field is now pointed to by R1 at entry.
7. If floating point option is on and 80X87 is installed,
hardware assist is used for CVB and CVD to speed up
instruction by up to 4 times for large numbers.
8. Add MVS program interruption element (PIE) control block
pointed to by R2 at entry to SPIE trap. This allows full
recovery from trap without losing content of registers.
(See CPY\IHAPIE.CPY for more information.)
9. Fix incorrect PSW on exception of executed instruction.
10. Add SVC 36 to load overlay file at specified virtual
address.
11. Add SVC 37 to define SVC user exit table.
See DEMO\DEMOTRAP.ALC for examples.
12. Add production version of emulator E370P42.EXE without
interactive debug or ASSIST facility to save 10k.

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