df6475181c
1. New Features 1.1 GRI-909 - This is a new simulator for the GRI-909. - It has been hand-tested; so far, no software has been discovered. 1.2 VAX - SET CPU CONHALT will cause a HALT instruction to return to the boot ROM console rather than to SIMH. SET CPU SIMHALT restores the default behavior. - BRB/W self at IPL 1F stops the simulator. This is the default behavior of VMS at exit. 1.3 PDP-18b - ATTACH -A PTR/PTP attaches the reader and punch in ASCII mode. In ASCII mode, the reader automatically sets the high order bit of incoming alphabetic data, and the punch clears the high order bit of outgoing data. 1.4 SCP - DO -V echoes commands from the file as they are executed. - Under Windows, execution priority is set BELOW_NORMAL when the simulator is running. 2. Release Notes 2.1 Bugs Fixed - PDP-11 CPU: fixed updating of MMR0 on a memory management error. - VAX FPA: changed function names to avoid conflict with C math library. - 1401 MT: read end of record generates group mark without word mark. - 1401 DP: fixed address generation and checking. - SCP: an EXIT within a DO command will cause the simulator to exit. 3. In Progress - Interdata 16b/32b: coded, not tested. - SDS 940: coded, not tested. - IBM 1620: coded, not tested. If you would like to help with the debugging of the untested simulators, they can be made available by special request.
410 lines
11 KiB
Text
410 lines
11 KiB
Text
To: Users
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From: Bob Supnik
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Subj: PDP-1 Simulator Usage
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Date: 15-Jun-02
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COPYRIGHT NOTICE
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The following copyright notice applies to both the SIMH source and binary:
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Original code published in 1993-2002, written by Robert M Supnik
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Copyright (c) 1993-2002, Robert M Supnik
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Permission is hereby granted, free of charge, to any person obtaining a
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copy of this software and associated documentation files (the "Software"),
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to deal in the Software without restriction, including without limitation
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the rights to use, copy, modify, merge, publish, distribute, sublicense,
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and/or sell copies of the Software, and to permit persons to whom the
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Software is furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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ROBERT M SUPNIK BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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Except as contained in this notice, the name of Robert M Supnik shall not
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be used in advertising or otherwise to promote the sale, use or other dealings
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in this Software without prior written authorization from Robert M Supnik.
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This memorandum documents the PDP-1 simulator.
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1. Simulator Files
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sim/ sim_defs.h
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scp.c
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scp_tty.c
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sim_rev.c
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sim/pdp1/ pdp1_defs.h
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pdp1_cpu.c
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pdp1_lp.c
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pdp1_stddev.c
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pdp1_sys.c
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2. PDP-1 Features
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The PDP-1 is configured as follows:
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device simulates
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name(s)
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CPU PDP-1 CPU with up to 64KW of memory
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PTR,PTP integral paper tape reader/punch
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TTI,TTO Flexowriter typewriter input/output
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LPT Type 62 line printer
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The PDP-1 simulator implements the following unique stop conditions:
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- an unimplemented instruction is decoded, and register
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STOP_INST is set
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- more than INDMAX indirect addresses are detected during
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memory reference address decoding
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- more than XCTMAX nested executes are detected during
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instruction execution
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- wait state entered, and no I/O operations outstanding
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(ie, no interrupt can ever occur)
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The PDP-1 loader supports RIM format tapes. The DUMP command is not
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implemented.
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2.1 CPU
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The only CPU options are the presence of hardware multiply/divide and the
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size of main memory.
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SET CPU MDV enable multiply/divide
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SET CPU NOMDV disable multiply/divide
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SET CPU 4K set memory size = 4K
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SET CPU 8K set memory size = 8K
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SET CPU 12K set memory size = 12K
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SET CPU 16K set memory size = 16K
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SET CPU 20K set memory size = 20K
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SET CPU 24K set memory size = 24K
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SET CPU 28K set memory size = 28K
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SET CPU 32K set memory size = 32K
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SET CPU 48K set memory size = 48K
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SET CPU 64K set memory size = 64K
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If memory size is being reduced, and the memory being truncated contains
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non-zero data, the simulator asks for confirmation. Data in the truncated
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portion of memory is lost. Initial memory size is 64K.
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CPU registers include the visible state of the processor as well as the
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control registers for the interrupt system.
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name size comments
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PC 16 program counter
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AC 18 accumulator
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IO 18 IO register
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OV 1 overflow flag
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PF 6 program flags<1:6>
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SS 6 sense switches<1:6>
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TW 18 test word (front panel switches)
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EXTM 1 extend mode
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IOSTA 18 IO status register
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SBON 1 sequence break enable
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SBRQ 1 sequence break request
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SBIP 1 sequence break in progress
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IOH 1 I/O halt in progress
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IOC 1 I/O continue
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PCQ[0:63] 16 PC prior to last jump or interrupt;
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most recent PC change first
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STOP_INST 1 stop on undefined instruction
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SBS_INIT 1 initial state of sequence break enable
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EXTM_INIT 1 initial state of extend mode
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WRU 8 interrupt character
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2.2 Programmed I/O Devices
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2.2.1 Paper Tape Reader (PTR)
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The paper tape reader (PTR) reads data from or a disk file. The POS
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register specifies the number of the next data item to be read. Thus,
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by changing POS, the user can backspace or advance the reader.
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The paper tape reader supports the BOOT command. BOOT PTR copies the
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RIM loader into memory and starts it running.
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The paper tape reader implements these registers:
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name size comments
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BUF 8 last data item processed
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DONE 1 device done flag
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RPLS 1 return restart pulse flag
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POS 32 position in the input file
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TIME 24 time from I/O initiation to interrupt
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STOP_IOE 1 stop on I/O error
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Error handling is as follows:
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error STOP_IOE processed as
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not attached 1 report error and stop
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0 out of tape
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end of file 1 report error and stop
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0 out of tape
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OS I/O error x report error and stop
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2.2.2 Paper Tape Punch (PTP)
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The paper tape punch (PTP) writes data to a disk file. The POS
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register specifies the number of the next data item to be written.
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Thus, by changing POS, the user can backspace or advance the punch.
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The paper tape punch implements these registers:
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name size comments
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BUF 8 last data item processed
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DONE 1 device done flag
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RPLS 1 return restart pulse flag
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POS 32 position in the output file
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TIME 24 time from I/O initiation to interrupt
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STOP_IOE 1 stop on I/O error
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Error handling is as follows:
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error STOP_IOE processed as
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not attached 1 report error and stop
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0 out of tape
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OS I/O error x report error and stop
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2.2.3 Terminal Input (TTI)
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The terminal input (TTI) polls the console keyboard for input. It
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implements these registers:
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name size comments
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BUF 8 last data item processed
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DONE 1 device done flag
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POS 32 number of characters input
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TIME 24 keyboard polling interval
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2.2.4 Terminal Output (TTO)
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The terminal output (TTO) writes to the simulator console window.
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It implements these registers:
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name size comments
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BUF 8 last data item processed
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DONE 1 device done flag
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RPLS 1 return restart pulse flag
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POS 32 number of characters output
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TIME 24 time from I/O initiation to interrupt
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2.2.5 Type 62 Line Printer (LPT)
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The paper line printer (LPT) writes data to a disk file. The POS
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register specifies the number of the next data item to be written.
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Thus, by changing POS, the user can backspace or advance the printer.
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The line printer implements these registers:
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name size comments
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BUF 8 last data item processed
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PNT 1 printing done flag
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SPC 1 spacing done flag
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RPLS 1 return restart pulse flag
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BPTR 6 print buffer pointer
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POS 32 position in the output file
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TIME 24 time from I/O initiation to interrupt
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STOP_IOE 1 stop on I/O error
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LBUF[0:119] 8 line buffer
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Error handling is as follows:
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error STOP_IOE processed as
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not attached 1 report error and stop
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0 out of tape or paper
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OS I/O error x report error and stop
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2.3 Symbolic Display and Input
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The PDP-1 simulator implements symbolic display and input. Display is
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controlled by command line switches:
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-a display as ASCII character
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-c display as FIODEC character string
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-m display instruction mnemonics
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Input parsing is controlled by the first character typed in or by command
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line switches:
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' or -a ASCII character
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" or -c three character FIODEC string
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alphabetic instruction mnemonic
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numeric octal number
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Instruction input uses modified PDP-1 assembler syntax. There are six
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instruction classes: memory reference, shift, skip, operate, IOT, and
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LAW.
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Memory reference instructions have the format
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memref {I} address
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where I signifies indirect reference. The address is an octal number in
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the range 0 - 0177777.
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Shift instructions have the format
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shift shift_count
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The shift count is an octal number in the range 0-9.
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Skip instructions consist of single mnemonics, eg, SZA, SZS4. Skip
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instructions may be or'd together
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skip skip skip...
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The sense of a skip can be inverted by including the mnemonic I.
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Operate instructions consist of single mnemonics, eg, CLA, CLI. Operate
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instructions may be or'd together
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opr opr opr...
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IOT instructions consist of single mnemonics, eg, TYI, TYO. IOT
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instructions may include an octal numeric modifier or the modifier I:
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iot modifier
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The simulator does not check the legality of skip, operate, or IOT
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combinations.
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Finally, the LAW instruction has the format
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LAW {I} immediate
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where immediate is in the range 0 to 07777.
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2.4 Character Sets
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The PDP-1's console was a Frieden Flexowriter; its character encoding
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was known as FIODEC. The PDP-1's line printer used a modified Hollerith
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character set. The following table provides equivalences between ASCII
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characters and the PDP-1's I/O devices. In the console table, UC stands
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for upper case.
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PDP-1 PDP-1
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ASCII console line printer
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000 - 007 none none
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bs 075 none
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tab 036 none
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012 - 014 none none
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cr 077 none
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016 - 037 none none
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space 000 000
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! {OR} UC+005 none
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" UC+001 none
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# {IMPLIES} UC+004 none
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$ none none
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% none none
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& {AND} UC+006 none
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' UC+002 none
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( 057 057
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) 055 055
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* {TIMES} UC+073 072
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+ UC+054 074
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, 033 033
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- 054 054
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. 073 073
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/ 021 021
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0 020 020
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1 001 001
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2 002 002
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3 003 003
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4 004 004
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5 005 005
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6 006 006
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7 007 007
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8 010 010
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9 011 011
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: none none
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; none none
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< UC+007 034
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= UC+033 053
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> UC+010 034
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? UC+021 037
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@ {MID DOT} 040 {MID DOT} 040
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A UC+061 061
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B UC+062 062
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C UC+063 063
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D UC+064 064
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E UC+065 065
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F UC+066 066
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G UC+067 067
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H UC+070 070
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I UC+071 071
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J UC+041 041
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K UC+042 042
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L UC+043 043
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M UC+044 044
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N UC+045 045
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O UC+046 046
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P UC+047 047
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Q UC+050 050
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R UC+051 051
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S UC+022 022
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T UC+023 023
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U UC+024 024
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V UC+025 025
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W UC+026 026
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X UC+027 027
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Y UC+030 030
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Z UC+031 031
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[ UC+057 none
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\ {OVERLINE} 056 {OVERLINE} 056
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] UC+055 none
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^ {UP ARROW} UC+011 {UP ARROW} 035
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_ UC+040 UC+040
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` {RT ARROW} UC+020 036
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a 061 none
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b 062 none
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c 063 none
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d 064 none
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e 065 none
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f 066 none
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g 067 none
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h 070 none
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i 071 none
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j 041 none
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k 042 none
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l 043 none
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m 044 none
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n 045 none
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o 046 none
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p 047 none
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q 050 none
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r 051 none
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s 022 none
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t 023 none
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u 024 none
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v 025 none
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w 026 none
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x 027 none
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y 030 none
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z 031 none
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{ none none
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| UC+056 076
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} none none
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~ UC+003 013
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del 075 none
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