To: Users | |
From: Bob Supnik | |
Subj: 18b PDP Simulator Usage | |
Date: 01-Feb-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 | |
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 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 shall not | |
be used in advertising or otherwise to promote the sale, use or other dealings | |
in this Software without prior written authorization from Robert M Supnik. | |
This memorandum documents the PDP-4, PDP-7, PDP-9, and PDP-15 simulators. | |
1. Simulator Files | |
To compile a particular model in the 18b family, you must include the appropriate | |
switch in the compilation command line: | |
PDP-4/ PDP4 | |
PDP-7/ PDP7 | |
PDP-9/ PDP9 | |
PDP-15/ PDP15 | |
If no model is specified, the default is the PDP-9. | |
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/pdp18b/ pdp18b_defs.h | |
pdp18b_cpu.c | |
pdp18b_drm.c | |
pdp18b_dt.c | |
pdp18b_lp.c | |
pdp18b_mt.c | |
pdp18b_rb.c | |
pdp18b_rf.c | |
pdp18b_rp.c | |
pdp18b_stddev.c | |
pdp18b_sys.c | |
pdp18b_tt1.c | |
2. 18b PDP Features | |
The other four 18b PDP's (PDP-4, PDP-7, PDP-9, PDP-15) are very similar | |
and are configured as follows: | |
system device simulates | |
name(s) | |
PDP-4 CPU PDP-4 CPU with 8KW of memory | |
PTR,PTP integral paper tape/Type 75 punch | |
TTI,TTO KSR28 console terminal (Baudot code) | |
LPT Type 62 line printer (Hollerith code) | |
CLK integral real-time clock | |
DT Type 550/555 DECtape | |
DRM Type 24 serial drum | |
PDP-7 CPU PDP-7 CPU with 32KW of memory | |
- Type 177 extended arithmetic element (EAE) | |
- Type 148 memory extension | |
PTR,PTP Type 444 paper tape reader/Type 75 punch | |
TTI,TTO KSR 33 console terminal | |
LPT Type 647 line printer | |
CLK integral real-time clock | |
DT Type 550/555 DECtape | |
DRM Type 24 serial drum | |
PDP-9 CPU PDP-9 CPU with 32KW of memory | |
- KE09A extended arithmetic element (EAE) | |
- KF09A automatic priority interrupt (API) | |
- KG09B memory extension | |
- KP09A power detection | |
- KX09A memory protection | |
PTR,PTP PC09A paper tape reader/punch | |
TTI,TTO KSR 33 console terminal | |
TTI1,TTO1 LT09A second console terminal | |
LP9 LP09 line printer | |
LPT Type 647E line printer | |
CLK integral real-time clock | |
RB RB09 fixed-head disk | |
RF RF09/RS09 fixed-head disk | |
DT TC02/TU55 DECtape | |
MT TC59/TU10 magnetic tape | |
PDP-15 CPU PDP-15 CPU with 32KW of memory | |
- KE15 extended arithmetic element (EAE) | |
- KA15 automatic priority interrupt (API) | |
- KF15 power detection | |
- KM15 memory protection | |
PTR,PTP PC15 paper tape reader/punch | |
TTI,TTO KSR 35 console terminal | |
TTI1,TTO1 LT15 second console terminal | |
LP9 LP09 line printer | |
LPT LP15 line printer | |
CLK integral real-time clock | |
RP RP15/RP02 disk pack | |
RF RF15/RS09 fixed-head disk | |
DT TC15/TU56 DECtape | |
MT TC59/TU10 magnetic tape | |
Most devices can be disabled or enabled, by the commands: | |
SET <dev> DISABLED | |
SET <dev> ENABLED | |
The simulator allows most device numbers to be changed, by the command: | |
SET <dev> DEV=<number> | |
However, devices can only be BOOTed with their default device numbers. | |
The 18b PDP simulators implement several unique stop conditions: | |
- an unimplemented instruction is decoded, and register | |
STOP_INST is set | |
- more than XCTMAX nested executes are detected during | |
instruction execution | |
The PDP-4 and PDP-7 loaders support only RIM format tapes. The PDP-9 | |
and PDP-15 support both RIM and BIN format tapes. If the file extension | |
is .RIM, or the -r switch is specified with LOAD, the file is assumed to | |
be RIM format; if the file extension is not .RIM, or if the -b switch is | |
specified, the file is assumed to be BIN format. RIM loading requires | |
that the loading address be specified on the command line. | |
2.1 CPU | |
The CPU options are the presence of the EAE, the presense of the API (for | |
the PDP-9 and PDP-15), and the size of main memory. | |
SET CPU EAE enable EAE | |
SET CPU NOEAE disable EAE | |
SET CPU API enable API | |
SET CPU NOAPI disable API | |
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 20K set memory size = 20K | |
SET CPU 24K set memory size = 24K | |
SET CPU 28K set memory size = 28K | |
SET CPU 32K set memory size = 32K | |
SET CPU 48K set memory size = 48K | |
SET CPU 64K set memory size = 64K | |
SET CPU 80K set memory size = 80K | |
SET CPU 96K set memory size = 96K | |
SET CPU 112K set memory size = 112K | |
SET CPU 128K set memory size = 128K | |
Memory sizes greater than 8K are only available on the PDP-7, PDP-9, and | |
PDP-15; memory sizes greater than 32KW are only available on the PDP-15. | |
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 8K for the PDP-4, 32K | |
for the PDP-7 and PDP-9, and 128K for the PDP-15. | |
CPU registers include the visible state of the processor as well as the | |
control registers for the interrupt system. | |
system name size comments | |
all PC addr program counter | |
all AC 18 accumulator | |
all L 1 link | |
7,9,15 MQ 18 multiplier-quotient | |
7,9,15 SC 6 shift counter | |
7,9,15 EAE_AC_SIGN 1 EAE AC sign | |
all SR 18 front panel switches | |
all INT[0:4] 32 interrupt requests, | |
0:3 = API levels 0-3 | |
4 = PI level | |
all IORS 18 IORS register | |
all ION 1 interrupt enable | |
all ION_DELAY 2 interrupt enable delay | |
9,15 APIENB 1 API enable | |
9,15 APIREQ 8 API requesting levels | |
9,15 APIACT 8 API active levels | |
9,15 BR addr memory protection bounds | |
15 XR 18 index register | |
15 LR 18 limit register | |
15 BR 17 memory protection bounds | |
9,15 USMD 1 user mode | |
9,15 USMDBUF 1 user mode buffer | |
9,15 NEXM 1 non-existent memory violation | |
9,15 PRVN 1 privilege violation | |
7,9 EXTM 1 extend mode | |
7,9 EXTM_INIT 1 extend mode value after reset | |
15 BANKM 1 bank mode | |
15 BANKM_INIT 1 bank mode value after reset | |
7 TRAPM 1 trap mode | |
7,9,15 TRAPP 1 trap pending | |
7,9 EMIRP 1 EMIR instruction pending | |
9,15 RESTP 1 DBR or RES instruction pending | |
9,15 PWRFL 1 power fail flag | |
all PCQ[0:63] addr PC prior to last JMP, JMS, CAL, or | |
interrupt; most recent PC change first | |
all STOP_INST 1 stop on undefined instruction | |
all WRU 8 interrupt character | |
"addr" signifies the address width of the system (13b for the PDP-4, 15b for | |
the PDP-7 and PDP-9, 17b for the PDP-15). | |
2.2 Programmed I/O Devices | |
2.2.1 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. | |
On the PDP-4 and PDP-7, the paper tape reader supports the BOOT command. | |
BOOT PTR copies the RIM loader into memory and starts it running, while | |
BOOT -F PTR copies the funny format binary loader into memory and starts | |
it running. | |
The PTR ATTACH command recognizes one switch, -A for ASCII mode. In | |
ASCII mode, data returned by the read alphabetic command has even parity. | |
This allows normal text files to be used as input to the paper tape reader. | |
The paper tape reader implements these registers: | |
name size comments | |
BUF 8 last data item processed | |
INT 1 interrupt pending flag | |
DONE 1 device done flag | |
ERR 1 error flag (PDP-9, PDP-15 only) | |
POS 32 position in the input 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 | |
OS I/O error x report error and stop | |
2.2.2 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 PTP ATTACH command recognizes one switch, -A for ASCII mode. In | |
ASCII mode, data is punched with the high order bit clear, and NULL and | |
DEL characters are supressed. This allows punch output to be processed | |
with normal text editing utilities. | |
The paper tape punch implements these registers: | |
name size comments | |
BUF 8 last data item processed | |
INT 1 interrupt pending flag | |
DONE 1 device done flag | |
ERR 1 error flag (PDP-9, PDP-15 only) | |
POS 32 position in the 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 or paper | |
OS I/O error x report error and stop | |
2.2.3 Terminal Input (TTI) | |
On the PDP-7, PDP-9, and PDP-15, the terminal interfaces (TTI, TTO) | |
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, the high order bit is forced to one on input, and printing of | |
ALTmode characters is supressed. In 7B mode, input and output characters | |
are masked to 7 bits. In 8B mode, characters are not modified. Changing | |
the mode of either interface changes both. The default mode is KSR. | |
On the PDP-9 and PDP-15, the console terminal operates, by default, | |
with local echo. For backward compatibility, the terminal input can | |
be set to FDX (full duplex), which supresses local echo. | |
The terminal input (TTI) polls the console keyboard for input. It | |
implements these registers: | |
name size comments | |
BUF 8 last data item processed | |
INT 1 interrupt pending flag | |
DONE 1 device done flag | |
POS 32 number of characters input | |
TIME 24 keyboard polling interval | |
2.2.4 Terminal Output (TTO) | |
The terminal output (TTO) writes to the simulator console window. It | |
implements these registers: | |
name size comments | |
BUF 8 last data item processed | |
INT 1 interrupt pending flag | |
DONE 1 device done flag | |
POS 32 number of chararacters output | |
TIME 24 time from I/O initiation to interrupt | |
2.2.5 Line Printers (LPT, LP9) | |
The line printers (LPT, LP9) write 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. | |
LPT is the "default" line printer for a CPU: Type 62 for the PDP-4, | |
Type 647 for the PDP-7 and PDP-9, and LP15 for the PDP-15. LP9 is | |
the LP09 line printer controller for the PDP-9. It may be needed | |
on the PDP-15 to run certain software packages. LP9 is disabled by | |
default. | |
The Type 62 printer controller implements these registers: | |
name size comments | |
BUF 8 last data item processed | |
INT 1 interrupt pending flag | |
DONE 1 device done flag | |
SPC 1 spacing done flag | |
BPTR 6 print buffer pointer | |
POS 32 position in the output file | |
TIME 24 time from I/O initiation to interrupt | |
STOP_IOE 1 stop on I/O error | |
LBUF[0:119] 8 line buffer | |
The Type 647 printer controller implements these registers: | |
name size comments | |
BUF 8 last data item processed | |
INT 1 interrupt pending flag | |
DONE 1 device done flag | |
ENABLE 1 interrupt enable (PDP-9 only) | |
ERR 1 error flag | |
BPTR 7 print buffer pointer | |
POS 32 position in the output file | |
TIME 24 time from I/O initiation to interrupt | |
STOP_IOE 1 stop on I/O error | |
LBUF[0:119] 8 line buffer | |
The LP09 printer controller implements these registers: | |
name size comments | |
BUF 7 output character | |
INT 1 interrupt pending flag | |
DONE 1 device done flag | |
ENABLE 1 interrupt enable | |
ERR 1 error flag | |
POS 32 position in the output file | |
TIME 24 time from I/O initiation to interrupt | |
The LP15 printer controller implements these registers: | |
name size comments | |
STA 18 status register | |
MA 18 DMA memory address | |
INT 1 interrupt pending flag | |
ENABLE 1 interrupt enable | |
LCNT 8 line counter | |
BPTR 7 print buffer pointer | |
POS 32 position in the output file | |
TIME 24 time from I/O initiation to interrupt | |
STOP_IOE 1 stop on I/O error | |
LBUF[0:131] 8 line buffer | |
For all printers, error handling is as follows: | |
error STOP_IOE processed as | |
not attached 1 report error and stop | |
0 out of tape or paper | |
OS I/O error x report error and stop | |
2.2.6 Real-Time Clock (CLK) | |
The real-time clock (CLK) implements these registers: | |
name size comments | |
INT 1 interrupt pending flag | |
DONE 1 device done flag | |
ENABLE 1 clock enable | |
TIME 24 clock frequency | |
TPS 8 ticks per second (60 or 50) | |
The real-time clock autocalibrates; the clock interval is adjusted up or | |
down so that the clock tracks actual elapsed time. | |
2.2.7 Second Terminal (TTI1, TTO1) | |
The second terminal consists of two independent devices, TTI1 and TTO1. | |
The second terminal performs input and output through a Telnet session | |
connected to a user-specified port. The ATTACH command specifies the | |
port to be used: | |
ATTACH TTI1 <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. | |
Once TTI1 is attached and the simulator is running, the terminal listens | |
for a connection on the specified port. It assumes that the incoming | |
connection is a Telnet connection. The connection remain opens until | |
disconnected by the Telnet client, or by a DETACH TTI1 command. | |
The second terminal (TTI1,TTO1) can be set to one of three modes: KSR, 7B, | |
or 8B. In KSR mode, lower case input and output characters are converted | |
automatically to upper case, the high order bit is forced to one on input, | |
and printing of ALTmode characters is supressed. In 7B mode, input and | |
output characters are masked to 7 bits. In 8B mode, characters are not | |
modified. Changing the mode of either device changes both. The default | |
mode is KSR. | |
The SHOW TTI1 CONNECTIONS command displays the current connection to TTI1. | |
The SHOW TTI1 STATISTICS command displays statistics for the current connection. | |
The SET TTI1 DISCONNECT{=0} disconnects the current connection. | |
The second terminal input implements these registers: | |
name size comments | |
BUF 8 last data item processed | |
INT 1 interrupt pending flag | |
DONE 1 device done flag | |
TIME 24 keyboard polling interval | |
The second terminal output implements these registers: | |
name size comments | |
BUF 8 last data item processed | |
INT 1 interrupt pending flag | |
DONE 1 device done flag | |
TIME 24 time from I/O initiation to interrupt | |
2.3 RP15/RP02 Disk Pack (RP) | |
RP15 options include the ability to make units write enabled or write locked: | |
SET RPn LOCKED set unit n write locked | |
SET RPn WRITEENABLED set unit n write enabled | |
Units can also be set ONLINE or OFFLINE. | |
The RP15 implements these registers: | |
name size comments | |
STA 18 status A | |
STB 18 status B | |
DA 18 disk address | |
MA 18 current memory address | |
WC 18 word count | |
INT 1 interrupt pending flag | |
BUSY 1 control busy flag | |
STIME 24 seek time, per cylinder | |
RTIME 24 rotational delay | |
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 disk not ready | |
end of file x assume rest of disk is zero | |
OS I/O error x report error and stop | |
2.4 Type 24 Serial Drum (DRM) | |
The serial drum (DRM) implements these registers: | |
name size comments | |
DA 9 drum address (sector number) | |
MA 16 current memory address | |
INT 1 interrupt pending flag | |
DONE 1 device done flag | |
ERR 1 error flag | |
WLK 32 write lock switches | |
TIME 24 rotational latency, per word | |
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 disk not ready | |
Drum data files are buffered in memory; therefore, end of file and OS | |
I/O errors cannot occur. | |
2.5 RB09 Fixed Head Disk (RB) | |
The RB09 was an early fixed-head disk for the PDP-9. It was superceded | |
by the RF09/RS09. It is disabled by default. | |
The RB09 implements these registers: | |
name size comments | |
STA 18 status | |
DA 20 current disk address | |
WC 16 word count | |
MA 15 memory address | |
INT 1 interrupt pending flag | |
WLK 20 write lock switches for track groups, | |
10 tracks per group | |
TIME 24 rotational delay, per word | |
BURST 1 burst flag | |
STOP_IOE 1 stop on I/O error | |
The RB09 is a data break device. If BURST = 0, word transfers are | |
scheduled individually; if BURST = 1, the entire transfer occurs in | |
a single data break. | |
Error handling is as follows: | |
error STOP_IOE processed as | |
not attached 1 report error and stop | |
0 disk not ready | |
RB09 data files are buffered in memory; therefore, end of file and OS | |
I/O errors cannot occur. | |
2.5 RF09/RF15/RS09 Fixed Head Disk (RF) | |
RF09/RF15 options include the ability to set the number of platters | |
to a fixed value between 1 and 8, or to autosize the number of platters | |
from the attached file: | |
SET RF 1P one platter (256K) | |
SET RF 2P two platters (512K) | |
SET RF 3P three platters (768K) | |
SET RF 4P four platters (1024K) | |
SET RF 5P five platters (1280K) | |
SET RF 6P six platters (1536K) | |
SET RF 7P seven platters (1792K) | |
SET RF 8P eight platters (2048K) | |
SET RF AUTOSIZE autosized on attach | |
The default is AUTOSIZE. | |
The RF09/RF15 implements these registers: | |
name size comments | |
STA 18 status | |
DA 21 current disk address | |
WC 18 word count (in memory) | |
CA 18 memory address (in memory) | |
BUF 18 data buffer (diagnostic only) | |
INT 1 interrupt pending flag | |
WLK[0:7] 16 write lock switches for disks 0-7 | |
TIME 24 rotational delay, per word | |
BURST 1 burst flag | |
STOP_IOE 1 stop on I/O error | |
The RF09/RF15 is a three-cycle data break device. If BURST = 0, word | |
transfers are scheduled individually; if BURST = 1, the entire transfer | |
occurs in a single data break. | |
Error handling is as follows: | |
error STOP_IOE processed as | |
not attached 1 report error and stop | |
0 disk not ready | |
RF15/RF09 data files are buffered in memory; therefore, end of file and OS | |
I/O errors cannot occur. | |
2.6 Type 550/555, TC02/TU55, and TC15/TU56 DECtape (DT) | |
The PDP-4 and PDP-7 use the Type 550 DECtape, a programmed I/O controller. | |
The PDP-9 uses the TC02, and the PDP-15 uses the TC15. The TC02 and TC15 | |
are DMA controllers and programmatically identical. PDP-4/7 DECtape format | |
had 4 18b words in its block headers and trailers; PDP-9/15 DECtape format | |
had 5 18b words. | |
DECtapes drives are numbered 1-8; in the simulator, drive 8 is unit 0. | |
DECtape options include the ability to make units write enabled or write | |
locked. | |
SET DTn WRITEENABLED set unit n write enabled | |
SET DTn LOCKED set unit n write locked | |
Units can also be set ONLINE or OFFLINE. | |
The Type 550, TC02, and TC15 support supports PDP-8 format, PDP-11 format, | |
and 18b format DECtape images. ATTACH tries to determine the tape | |
format from the DECtape image; the user can force a particular format | |
with switches: | |
-r PDP-8 format | |
-s PDP-11 format | |
-t 18b format | |
The DECtape controller is a data-only simulator; the timing and mark | |
track, and block header and trailer, are not stored. Thus, the WRITE | |
TIMING AND MARK TRACK function is not supported; the READ ALL function | |
always returns the hardware standard block header and trailer; and the | |
WRITE ALL function dumps non-data words into the bit bucket. | |
The DECtape controller implements these registers: | |
system name size comments | |
all DTSA 12 status register A | |
all DTSB 12 status register B | |
all DTDB 18 data buffer | |
all INT 1 interrupt pending flag | |
9,15 ENB 1 interrupt enable flag | |
all DTF 1 DECtape flag | |
7 BEF 1 block end flag | |
all ERF 1 error flag | |
9,15 CA 18 current address (memory location 30) | |
9,15 WC 18 word count (memory location 31) | |
all LTIME 31 time between lines | |
all ACTIME 31 time to accelerate to full speed | |
all DCTIME 31 time to decelerate to a full stop | |
all SUBSTATE 2 read/write command substate | |
all POS[0:7] 32 position, in lines, units 0-7 | |
all STATT[0:7] 18 unit state, units 0-7 | |
It is critically important to maintain certain timing relationships | |
among the DECtape parameters, or the DECtape simulator will fail to | |
operate correctly. | |
- LTIME must be at least 6 | |
- ACTIME must be less than DCTIME, and both need to be at | |
least 100 times LTIME | |
2.7 TC59/TU10 Magnetic Tape (MT) | |
Magnetic tape options include the ability to make units write enabled or | |
or write locked. | |
SET MTn LOCKED set unit n write locked | |
SET MTn WRITEENABLED set unit n write enabled | |
Units can also be set ONLINE or OFFLINE. | |
The magnetic tape controller implements these registers: | |
name size comments | |
CMD 18 command | |
STA 18 main status | |
CA 18 memory address (in memory) | |
WC 18 word count (in memory) | |
INT 1 interrupt pending flag | |
STOP_IOE 1 stop on I/O error | |
TIME 24 record delay | |
UST[0:7] 24 unit status, units 0-7 | |
POS[0:7] 32 position, units 0-7 | |
Error handling is as follows: | |
error processed as | |
not attached tape not ready; if STOP_IOE, stop | |
end of file bad tape | |
OS I/O error parity error; if STOP_IOE, stop | |
2.8 Symbolic Display and Input | |
The 18b PDP simulators implement symbolic display and input. Display is | |
controlled by command line switches: | |
-a display as ASCII character | |
-c display as (sixbit) character string | |
-m display instruction mnemonics | |
The PDP-15 also recognizes an additional switch: | |
-p display as packed ASCII (five 7b ASCII | |
characters in two 18b words) | |
Input parsing is controlled by the first character typed in or by command | |
line switches: | |
' or -a ASCII character | |
" or -c three character sixbit string | |
alphabetic instruction mnemonic | |
numeric octal number | |
The PDP-15 also recognizes an additional input mode: | |
# or -p five character packed ASCII string in | |
two 18b words | |
Instruction input uses standard 18b PDP assembler syntax. There are six | |
instruction classes: memory reference, EAE, index (PDP-15 only), IOT, | |
operate, and LAW. | |
Memory reference instructions have the format | |
memref {I/@} address{,X} | |
where I (PDP-4, PDP-7, PDP-9) /@ (PDP-15) signifies indirect reference, | |
and X signifies indexing (PDP-15 in page mode only). The address is an | |
octal number in the range 0 - 017777 (PDP-4, PDP-7, PDP-9, and PDP-15 in | |
bank mode) or 0 - 07777 (PDP-15 in page mode). | |
IOT instructions consist of single mnemonics, eg, KRB, TLS. IOT instructions | |
may be or'd together | |
iot iot iot... | |
IOT's may also include the number 10, signifying clear the accumulator | |
iot 10 | |
The simulator does not check the legality of IOT combinations. IOT's for | |
which there is no opcode may be specified as IOT n, where n is an octal | |
number in the range 0 - 07777. | |
EAE instructions have the format | |
eae {+/- shift count} | |
EAE instructions may be or'd together | |
eae eae eae... | |
The simulator does not check the legality of EAE combinations. EAE's for | |
which there is no opcode may be specified as EAE n, where n is an octal | |
number in the range 0 - 037777. | |
Index instructions (PDP-15 only) have the format | |
index {immediate} | |
The immediate, if allowed, must be in the range of -0400 to +0377. | |
Operate instructions have the format | |
opr opr opr... | |
The simulator does not check the legality of the proposed combination. The | |
operands for MUY and DVI must be deposited explicitly. | |
Finally, the LAW instruction has the format | |
LAW immediate | |
where immediate is in the range of 0 to 017777. | |
2.9 Character Sets | |
The PDP-4's console was an ASR-28 Teletype; its character encoding was | |
Baudot. The PDP-4's line printer used a modified Hollerith character | |
set. The PDP-7's and PDP-9's consoles were KSR-33 Teletypes; their | |
character sets were basically ASCII. The PDP-7's and PDP-9's line | |
printers used sixbit encoding (ASCII codes 040 - 0137 masked to six | |
bits). The PDP-15's I/O devices were all ASCII. The following table | |
provides equivalences between ASCII characters and the PDP-4's I/O devices. | |
In the console table, FG stands for figures (upper case). | |
PDP-4 PDP-4 | |
ASCII console line printer | |
000 - 006 none none | |
bell FG+024 none | |
010 - 011 none none | |
lf 010 none | |
013 - 014 none none | |
cr 002 none | |
016 - 037 none none | |
space 004 000 | |
! FG+026 none | |
" FG+021 none | |
# FG+005 none | |
$ FG+062 none | |
% none none | |
& FG+013 none | |
' FG+032 none | |
( FG+036 057 | |
) FG+011 055 | |
* none 072 | |
+ none 074 | |
, FG+006 033 | |
- FG+030 054 | |
. FG+007 073 | |
/ FG+027 021 | |
0 FG+015 020 | |
1 FG+035 001 | |
2 FG+031 002 | |
3 FG+020 003 | |
4 FG+012 004 | |
5 FG+001 005 | |
6 FG+025 006 | |
7 FG+034 007 | |
8 FG+014 010 | |
9 FG+003 011 | |
: FG+016 none | |
; FG+017 none | |
< none 034 | |
= none 053 | |
> none 034 | |
? FG+023 037 | |
@ none {MID DOT} 040 | |
A 030 061 | |
B 023 062 | |
C 016 063 | |
D 022 064 | |
E 020 065 | |
F 026 066 | |
G 013 067 | |
H 005 070 | |
I 014 071 | |
J 032 041 | |
K 036 042 | |
L 011 043 | |
M 007 044 | |
N 006 045 | |
O 003 046 | |
P 015 047 | |
Q 035 050 | |
R 012 051 | |
S 024 022 | |
T 001 023 | |
U 034 024 | |
V 017 025 | |
W 031 026 | |
X 027 027 | |
Y 025 030 | |
Z 021 031 | |
[ none none | |
\ none {OVERLINE} 056 | |
] none none | |
^ none {UP ARROW} 035 | |
_ none UC+040 | |
0140 - 0177 none none |