simh.simh/H316/h316_doc.txt

To:	Users
From:	Bob Supnik
Subj:	H316 Simulator Usage
Date:	15-Jul-2003

			COPYRIGHT NOTICE

The following copyright notice applies to both the SIMH source and binary:

   Original code published in 1993-2003, written by Robert M Supnik
   Copyright (c) 1993-2003, Robert M Supnik

   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
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   Except as contained in this notice, the name of Robert M Supnik shall not
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This memorandum documents the Honeywell 316/516 simulator.


1. Simulator Files

The H316 requires the following files:

sim/		sim_defs.h
		sim_rev.h
		sim_sock.h
		sim_tmxr.h
		scp.c
		scp_tty.c
		sim_sock.c
		sim_tmxr.c

sim/h316/	h316_defs.h
		h316_cpu.c
		h316_lp.c
		h316_stddev.c
		h316_sys.c

2. H316/H516 Features

The Honeywell 316/516 simulator is configured as follows:

device		simulates
name(s)

CPU		H316/H516 CPU with 16/32KW memory
PTR		316/516-50 paper tape reader
PTP		316/516-52 paper tape punch
TTY		316/516-33 console terminal
CLK		316/516-12 real time clock
LPT		316/516 line printer

The H316/H516 simulator implements several unique stop conditions:

	- decode of an undefined instruction, and STOP_INST is et
	- reference to an undefined I/O device, and STOP_DEV is set
	- more than INDMAX indirect references are detected during
	  memory reference address decoding

The H316/H516 loader is not implemented.

2.1 CPU

CPU options include choice of instruction set and memory size.

	SET CPU HSA		high speed arithmetic instructions
	SET CPU NOHSA		no high speed arithmetic instructions
	SET CPU 4K		set memory size = 4K
	SET CPU 8K		set memory size = 8K
	SET CPU 12K		set memory size = 12K
	SET CPU 16K		set memory size = 16K
	SET CPU 24K		set memory size = 24K
	SET CPU 32K		set memory size = 32K

If memory size is being reduced, and the memory being truncated contains
non-zero data, the simulator asks for confirmation.  Data in the truncated
portion of memory is lost.  Initial memory size is 32K.

CPU registers include the visible state of the processor as well as the
control registers for the interrupt system.

	name		size	comments

	P		15	program counter
	A		16	A register
	B		16	B register
	X		16	index register
	SC		16	shift count
	C		1	carry flag
	EXT		1	extend flag
	PME		1	previous mode extend flag
	EXT_OFF		1	extend off pending flag
	DP		1	double precision flag
	SS1..4		1	sense switches 1..4
	ION		1	interrupts enabled
	INODEF		1	interrupts not deferred
	INTREQ		16	interrupt requests
	DEVRDY		16	device ready flags (read only)
	DEVENB		16	device interrupt enable flags (read only)
	STOP_INST	1	stop on undefined instruction
	STOP_DEV	1	stop on undefined device
	INDMAX		1	indirect address limit
	PCQ[0:63]	15	PC prior to last JMP, JSB, or interrupt;
				most recent PC change first
	WRU		8	interrupt character

2.2 Programmed I/O Devices

2.2.1 316/516-50 Paper Tape Reader (PTR)

The paper tape reader (PTR) reads data from a disk file.  The POS
register specifies the number of the next data item to be read.
Thus, by changing POS, the user can backspace or advance the reader.

The paper tape reader supports the BOOT command.  BOOT PTR copies the
absolute binary loader into memory and starts it running.

The paper tape reader implements these registers:

	name		size	comments

	BUF		8	last data item processed
	INTREQ		1	device interrupt request
	READY		1	device ready
	ENABLE		1	device interrupts enabled
	POS		32	position in the input or output file
	TIME		24	time from I/O initiation to interrupt
	STOP_IOE	1	stop on I/O error

Error handling is as follows:

	error	     STOP_IOE	processed as

	not attached	1	report error and stop
			0	out of tape

	end of file	1	report error and stop
			0	out of tape or paper

	OS I/O error	x	report error and stop

2.2.2 316/516-52 Paper Tape Punch (PTP)

The paper tape punch (PTP) writes data to a disk file.  The POS
register specifies the number of the next data item to be written.
Thus, by changing POS, the user can backspace or advance the punch.

The paper tape punch implements these registers:

	name		size	comments

	BUF		8	last data item processed
	INTREQ		1	device interrupt request
	READY		1	device ready
	ENABLE		1	device interrupts enabled
	POWER		1	device powered up
	POS		32	position in the input or output file
	TIME		24	time from I/O initiation to interrupt
	PWRTIME		24	time from I/O request to power up
	STOP_IOE	1	stop on I/O error

Error handling is as follows:

	error	     STOP_IOE	processed as

	not attached	1	report error and stop
			0	out of tape

	OS I/O error	x	report error and stop

2.2.3 316/516-33 Console Teletype (TTY)

The Teletype units (TTY0, TTY1) can be set to one of three modes:
KSR, 7B, or 8B.  In KSR mode, lower case input and output characters
are automatically converted to upper case, and the high order bit is
forced to one on input.  In 7B mode, input and output characters are
masked to 7 bits.  In 8B mode, characters are not modified.  Changing
the mode of either unit changes both.  The default mode is KSR.

The Teletype reads from the console keyboard and writes to the
simulator console window.  It implements these registers:

	name		size	comments

	BUF		8	last data item processed
	MODE		1	read/write mode
	INTREQ		1	device interrupt request
	READY		1	device ready
	ENABLE		1	device interrupts enabled
	KPOS		32	number of characters input
	KTIME		24	keyboard polling interval
	TPOS		32	number of characters output
	TTIME		24	time from I/O initiation to interrupt

2.2.4 316/516-12 Real Time Clock (CLK)

The real time clock (CLK) frequency can be adjusted as follows:

	SET CLK 60HZ		set frequency to 60Hz
	SET CLK 50HZ		set frequency to 50Hz

The default is 60Hz.

The clock implements these registers:

	name		size	comments

	INTREQ		1	device interrupt request
	READY		1	device ready
	ENABLE		1	device interrupts enabled
	TIME		24	clock interval

The real-time clock autocalibrates; the clock interval is adjusted up or
down so that the clock tracks actual elapsed time.

2.2.5 316/516 Line Printer (LPT)

The line printer (LPT) writes data to a disk file.  The POS register
specifies the number of the next data item to be written.  Thus,
by changing POS, the user can backspace or advance the printer.

The line printer implements these registers:

	name		size	comments

	WDPOS		6	word position in current scan
	DRPOS		6	drum position
	CRPOS		1	carriage position
	XFER		1	transfer ready flag
	PRDN		1	print done flag
	INTREQ		1	device interrupt request
	ENABLE		1	device interrupt enable
	SVCST		2	service state
	SVCCH		2	service channel
	BUF		8	buffer
	POS		32	number of characters output
	XTIME		24	delay between transfers
	ETIME		24	delay at end of scan
	PTIME		24	delay for shuttle/line advance
	STOP_IOE	1	stop on I/O error

Error handling is as follows:

	error	     STOP_IOE	processed as

	not attached	1	report error and stop
			0	out of paper

	OS I/O error	x	report error and stop

2.3 Symbolic Display and Input

The H316/H516 simulator implements symbolic display and input.  Display is
controlled by command line switches:

	-a			display as ASCII character
	-c			display as two character string
	-m			display instruction mnemonics

Input parsing is controlled by the first character typed in or by command
line switches:

	' or -a			ASCII character
	" or -c			two character sixbit string
	alphabetic		instruction mnemonic
	numeric			octal number

Instruction input uses standard H316/H516 assembler syntax.  There are six
instruction classes: memory reference, I/O, control, shift, skip, and
operate.

Memory reference instructions have the format

	memref{*} {C/Z} address{,1}

where * signifies indirect, C a current sector reference, Z a sector zero
reference, and 1 indexed.  The address is an octal number in the range 0 -
077777; if C or Z is specified, the address is a page offset in the range
0 - 0777.  Normally, C is not needed; the simulator figures out from the
address what mode to use.  However, when referencing memory outside the CPU,
there is no valid PC, and C must be used to specify current sector addressing.

I/O instructions have the format

	io pulse+device

The pulse+device is an octal number in the range 0 - 01777.

Control and operate instructions consist of a single opcode

	opcode

Shift instructions have the format

	shift n

where n is an octal number in the range 0-77.

Skip instructions have the format

	sub-op sub-op sub-op...

The simulator checks that the combination of sub-opcodes is legal.