1. IBM 7090/7094 simulator usage¶

Date:: 2008-12-01
Revision:: $Format:%H$
Copyright:: See LICENSE.txt for terms of use.

Copyright notice

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

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 THE AUTHORS 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 names of The Authors shall not be used in advertising or otherwise to promote the sale, use or other dealings in this Software without prior written authorization from the Authors.

This memorandum documents the IBM 7094 simulator.

1.1. Simulator files¶

To compile the IBM 7094, 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/i7094/: i7094_defs.h

i7094_dat.h

i7094_cd.c

i7094_clk.c

i7094_com.c

i7094_cpu.c

i7094_cpu1.c

i7094_drm.c

i7094_dsk.c

i7094_io.c

i7094_lp.c

i7094_mt.c

i7094_sys.c

1.2. IBM 7090/7094 features¶

The IBM 7090/7094 simulator is configured as follows:

Device name(s)	Simulates
`CPU`	7090, 7094, or 7094 with CTSS RPQ’s CPU with 32KW, 32KW, or 64KW of memory, respectively
`CLK`	Interval timer (RPQ F89349) and Chronolog clock
`CHANA`	7607 channel (required)
`CHANB`..`CHANH`	Additional 7607, 7289, or 7909 channels
`MTA`	Magnetic tape controller, channel A (required)
`MTB`..`MTH`	Additional magnetic tape controllers, channels B to H
`CDR`	711 card reader
`CDP`	721 card punch
`LPT`	716 line printer
`DSK`	7631 file control with up to 10 modules (disks or drums)
`DRM`	7289 fast drum control
`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 7090/7094 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 is not implemented.

1.2.1. CPU¶

The CPU options allow the user to specify a 7090, a 7094, or a 7094 with CTSS RPQs.

SET CPU 7090            7090
SET CPU 7094            Standard 7094
SET CPU CTSS            7094 with CTSS RPQs

Memory size is 32KW on a 7090 or 7094 CPU, 64KW on a CTSS CPU. CTSS mode enables access to the Chronolog clock as magtape unit A7.

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

Name	Size	Comments
`PC`	15	Program counter
`AC`	38	Accumulator
`MQ`	36	Multiplier-quotient
`SI`	36	Storage indicators
`KEYS`	36	Front panel keys
`XR1`..`XR7`	15	Index registers 1 to 7 [7090 uses only `XR1`, `XR2`, `XR4`]
`SS1`..`SS6`	1	Sense switches 1 to 6
`SL1`..`4`	1	Sense lights 1 to 4
`OVF`	1	AC overflow indicator
`MQO`	1	MQ overflow indicator
`DVC`	1	Divide check indicator
`IOC`	1	I/O check indicator
`TTRAP`	1	Transfer trap enable
`CTRAP`	1	Copy trap enable
`STRAP`	1	Select trap enable
`FTRAP`	1	Floating point trap enable
`STORN`	1	Storage nullification mode enable
`MULTI`	1	Multiple-tag mode enable [always 1 on 7090]
`CHREQ`	8	Channel request flags
`CHTR_PEND`	1	Channel trap pending
`CHTR_INHT`	1	Channel trap inhibit
`CHTR_INHI`	1	Channel trap instruction inhibit
`CHTR_ENAB`	30	Channel trap enable flags
`USERM`	1	User mode flag [CTSS only]
`IMEM`	1	Instruction B-core flag [CTSS only]
`DMEM`	1	Data B-core flag [CTSS only]
`RELOC`	8	Relocation base block [CTSS only]
`START`	8	Address start block [CTSS only]
`LIMIT`	8	Address limit block [CTSS only]
`OLDPC`	15	PC at start of instruction
`PCQ[0:63]`	15	PC prior to last jump or interrupt; Most recent PC change first
`HTPEND`	1	Halt and transfer pending
`HTADDR`	15	Halt and transfer address
`XECMAX`	8	XEC chain limit
`WRU`	8	Interrupt character
`STOP_ILL`	1	Stop on undefined instruction

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

If switch -C is set, channel commands are also included in the CPU history. The maximum length for the history is 262144 entries.

1.2.2. Interval timer (`CLK`)¶

The timer (CLK) implements a 60Hz interval timer. It is disabled by default.

The timer has the following registers:

Name	Size	Comments
`TRAP`	1	Interval timer trap flag
`TIME`	24	Tick delay

1.2.3. I/O channels (`CHANA`..`CHANH`)¶

The 709X supports up to 8 channels. Channel models include:

 Standard multiplexer channel
 High speed drum channel
 Advanced capabilities channel

Channel A is required and is always a 7607. Channels B through H are disabled by default. Channels B through H can be enabled. When a channel is enabled, the attached device must also be specified:

SET CHANx ENABLED{=[729|TAPE|7289|DRUM|7631|FILE|7750|COMM]}

If no device type is specified, TAPE is assumed.

Setting a channel to 729 (synonym TAPE) defines the channel as a 7607 and enables the corresponding magnetic tape controller. Setting a channel to 7289 (synonym DRUM) defines the channel as a 7289 and enables the high-speed drum control. Setting a channel to 7631 defines the channel as a 7909 and enables the file control. Setting a channel to 7750 (synonym COMM) defines the channel as a 7909 and enables the communications control. Only one high-speed drum control, one file control, and one communications control are supported per system.

As an example, the following commands set up the 1971 CTSS configuration:

SET CPU CTSS
SET CLK ENABLED
SET CHANB ENABLED=TAPE
SET CHANC ENABLED=DISK
SET CHANE ENABLED=COMM
SET CHANG ENABLED=DRUM

Channels have the following registers:

Name	Type	Size	Comments
`STATE`	All	8	Channel state
`DSC`	7607,7289	4	Data select
`DSU`	7607,7289	9	Data select unit
`NDSC`	7607,7289	4	Non-data select
`NDSU`	7607,7289	9	Non-data select unit
`FLAGS`	All	30	Channel flags
`IDF`	All	2	Input data flags
`OP`	All	5	Channel opcode
`CLC`	All	16	Channel location counter
`WC`	All	15	Channel word counter
`CA`	All	16	Channel current address
`AR`	All	36	Channel assembly register
`CND`	7909	6	Channel interrupt conditions
`LCC`	7909	6	Channel control counter
`SMS`	7909	7	Channel options mask

1.2.4. Channel A devices¶

1.2.4.1. 711 card reader (`CDR`)¶

The card reader (CDR) reads data from a disk file. Cards are simulated as ASCII lines with terminating newlines. 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.

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

or in the ATTACH command:

ATT -T CDR <file>      Set text mode
ATT CDR <file>.TXT     Set text mode
ATT -C CDR <file>      Set column binary mode
ATT CDR <file>.CBN     Set column binary mode

The card reader supports the BOOT command. BOOT CDR starts the standard card reader bootstrap at location 0.

The card reader implements these registers:

Name	Size	Comments
`STATE`	2	Reader state
`BPTR`	5	Binary buffer pointer
`BUF[0:23]`	36	Binary buffer
`POS`	32	Position in the input file
`TSTART`	24	Card start delay
`TSTOP`	24	Card stop delay
`TLEFT`	24	Delay between row halves
`TRIGHT`	24	Delay between rows

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

1.2.4.2. 721 card punch (`CDP`)¶

The card reader (CDP) writes data to a disk file. Cards are simulated as ASCII lines with terminating newlines. 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.

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

or in the ATTACH command:

ATT -T CDP <file>      Set text mode
ATT CDP <file>.TXT     Set text mode
ATT -C CDR <file>      Set column binary mode
ATT CDP <file>.CBN     Set column binary mode

The card punch supports both the business (1403 print chain A) and Fortran (1403 print chain H) character sets:

SET CDP BUSINESS       Business character set
SET CDP FORTRAN        Fortran character set

The Fortran character set is the default.

The card punch implements these registers:

Name	Size	Comments
`STATE`	2	Reader state
`CHOB`	36	Channel output buffer
`CHOBV`	1	Output buffer valid flag
`BPTR`	5	Binary buffer pointer
`BUF[0:23]`	36	Binary buffer
`POS`	32	Position in the output file
`TSTART`	24	Card start delay
`TSTOP`	24	Card stop delay
`TLEFT`	24	Delay between row halves
`TRIGHT`	24	Delay between rows

Error handling is as follows:

Error	Processed as
Not attached	Report error and stop
OS I/O error	Report error and stop

1.2.4.3. 716 line printer (`LPT`)¶

The line printer (LPT) writes data to a disk file as ASCII text with terminating newlines. 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 both 48- and 64-character print chains:

SET LPT 64             64-character print chain
SET LPT 48             48-character print chain

The line printer also implements both the business (1403 print chain A) and Fortran (1403 H chain) character sets:

SET LPT BUSINESS       Business print character set
SET LPT FORTRAN        Fortran character set

The default is 64 characters, Fortran set.

Finally, because the line printer was used for status output messages, its output can be redirected to the controlling terminal window if no file is attached:

SET LPT DEFAULT        Default output to console window
SET LPT NODEFAULT      No default output, error if not attached

The line printer implements these registers:

Name	Size	Comments
`STATE`	2	Printer state
`CMD`	2	Printer command
`CHOB`	36	Channel output buffer
`CHOBV`	1	Output buffer valid flag
`BPTR`	5	Binary buffer pointer
`BUF[0:23]`	36	Binary buffer
`EBUF[0:22]`	36	Echo buffer
`POS`	32	Position in the output file
`TSTART`	24	Line start delay
`TSTOP`	24	Line print delay
`TLEFT`	24	Delay between row halves
`TRIGHT`	24	Delay between rows

Error handling is as follows:

Error	Processed as
Not attached	Report error and stop
OS I/O error	Report error and stop

1.2.5. 729 magnetic tape (`MTA`…`MTH`)¶

Every 7607 channel can support up to ten seven-track magnetic tape units (MTx1…MTx10). Magnetic tape options include the ability to make units write enabled or write locked.

SET MTn LOCKED              Set unit n write locked
SET MTn WRITEENABLED        Set unit n write enabled

Magnetic tape units can be set to a specific reel capacity in MB, or to unlimited capacity:

SET MTn CAPAC=m             Set unit n capacity to m MB (0 = unlimited)
SHOW MTn CAPAC              Show unit n capacity in MB

Units can also be set ENABLED or DISABLED. The magnetic tape simulator supports the BOOT command. BOOT MTxn starts the standard magnetic tape load program at location 0.

The magnetic tape controllers implement the following registers:

Name	Size	Comments
`UNIT`	5	Unit select code
`CHOB`	36	Channel output buffer
`CHOBV`	1	Output buffer valid flag
`BPTR`	16	Buffer pointer
`BLNT`	16	Buffer length
`BUF`	7	Character buffer (with parity)
`TWEF`	24	Wait time for end of file
`TSHORT`	24	Wait time for “immediate” commands
`TSTART`	24	Wait time for unit start
`TSTOP`	24	Wait time for unit stop
`TWORD`	24	Wait time between word transfers
`UST[1:10]`	5	Unit state, drives 1 to 10
`POS[1:10]`	32	Position, drives 1 to 10

Error handling is as follows:

Error	Processed as
Not attached	Report error and stop
End-of-file	Set error indicator
OS I/O error	Print error message Set error indicator Report error and stop

1.2.6. 7631 file control (`DSK`)¶

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. The type can be set only if the unit (and the next unit in sequence) is unattached, and the unit number is even:

SET DSKn 7320          Unit n is a drum (unit n+1 is disabled)
SET DSKn 1301          Unit n is a 1301 disk (unit n+1 is the same)
SET DSKn 1302          Unit n is a 1302 disk (unit n+1 is the same)
SET DSKn 2302          Unit n is a 2302 disk (unit n+1 is the same)

Units can be SET ENABLED or DISABLED. In addition, units can be set to enable or disable formatting:

SET DSKn FORMAT        Enable formatting
SET DSKn NOFORMAT      Disable formatting

Formatting is disabled by default. The current format can be shown with the command:

SHOW DSKn FORMAT       Display format information

The 7631 implements the following registers:

Name	Size	Comments
`STATE`	6	File control state
`ACCESS`	1	Currently selected access
`MODULE`	4	Currently selected module (0-9)
`RECORD`	36	Record address (6 BCD characters)
`MODE`	4	Disk I/O mode
`SENSE`	60	Sense data (10 BCD characters)
`BCDCMD`	60	Most recent command (10 BCD characters)
`CHOB`	36	Channel output buffer
`CHOBV`	1	Output buffer valid flag
`STOP`	1	Channel stop flag
`FCNTR`	13	Format track character counter
`BUF[0:999]`	36	Track buffer
`RBASE`	10	Offset to record base
`RPTR`	10	Offset to current word
`RLIM`	10	Offset to record end
`STIME`	24	Seek delay
`RTIME`	24	Rotational delay
`WTIME`	24	Inter-word delay
`GTIME`	24	End-of-sector (gap) delay
`CTIME`	24	Command processing delay
`TRACK[0:19]`	10	Current track number [0:9] module n, access 0 [10:19] module n, access 1

Error handling is as follows:

Error	Processed as
Not attached	Report error and stop
OS I/O error	Report error and stop

1.2.7. 7289 high-speed drum (`DRM`)¶

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 implements these registers:

Name	Size	Comments
`STATE`	2	Drum state
`DA`	18	Drum address register
`OP`	1	Read/write flag
`CHOB`	36	Channel output buffer
`CHOBV`	1	Output buffer valid flag
`TIME`	24	Inter-word delay

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.

1.2.8. 7750 communications controller (`COM` and `COML`)¶

The 7750 is modeled as a terminal multiplexer with 33 lines. It consists of two devices: COM is the multiplexer controller, and COML is the individual 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 two modes: KSR-35 and KSR-37. In KSR-35 mode, lowercase input and output characters are converted automatically to uppercase, and parity is ignored. In KSR-37 mode, lowercase 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 connection. A connection remains 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
SHOW COM FREEQ               Displays the character buffer free list
SHOW COM INPQ                Displays the character input queue
SHOW COM OUTQ                Displays the output queues for all lines
SHOW COMn OUTQ               Displays the output queue for line n

The 7750 implements the following special SET commands:

SET COM DISCONNECT=n         Disconnect line n
SET COMLn DISCONNECT         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

The controller (COM) implements these registers:

Name	Size	Comments
`ENABLE`	1	Enable flag
`STATE`	6	Controller state
`MSGNUM`	12	Input message sequence number
`CHOB`	36	Channel output buffer
`CHOBV`	1	Output buffer valid flag
`STOP`	1	Channel stop flag
`BUF[0:119]`	36	Channel buffer
`BPTR`	7	Channel buffer pointer
`BLIM`	7	Channel buffer limit
`FREEQ[0:1]`	16	Free queue header
`INPQ[0:1]`	16	Input queue header
`OUTQ[0:65]`	16	Output queue headers, lines 0 to 32
`PKTB[0:32767]`	16	Character buffer entries

Queue headers consist of two 16-bit words; both are subscripts into the character buffer array. The first word is the buffer subscript for the queue head; the second is the buffer subscript for the queue tail. In an empty queue, both words are 0.

Character buffer entries also consist of two 16-bit words. The first is the buffer subscript for the next entry in the queue; 0 indicates end of queue. The second is the data element, typically a 12-bit character.

The lines (COML) implements these registers:

Name	Size	Comments
`TIME[0:32]`	24	Transmit time, lines 0 to 32

The 7750 does not support save and restore. All open connections, except the permanent connection to the console window, are lost when the simulator shuts down or COM is detached.

1.3. Symbolic display and input¶

The IBM 7094 simulator implements symbolic display and input. Display is controlled by command-line switches:

`-c`	Display as character
`-s`	Display as character string
`-m`	Display instruction mnemonics
`-i`	Display as 7607 IO instruction
`-n`	Display as 7909 IO instruction

Character and string display is further qualified by switches that specify the character coding and conversion conventions:

`-b`	BCD data (default is nine-code)
`-a`	Business character set (default is Fortran)

The default data coding is nine-code, and the default character set is Fortran. Note that 7094 BCD and IBM 1401 BCD differ in one important regard: the 7094 interprets 0 as code 20, the 1401 as code 12.

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

`'` or `-c`	Character
`"` or `-s`	String
Alphabetic	Instruction mnemonic
Numeric	Octal number

Instruction input uses standard 7094 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.

1.4. Character sets¶

The IBM 7094 uses a 6-bit character code called 9-code, a variation (with permuted zones) of the ubiquitous BCD (binary coded decimal). The 7094 also uses BCD for communicating with the card reader/punch and the line printer. In both 9-code and BCD, some of the characters have no equivalent in ASCII and require different representations:

9-code	ASCII representation	IBM 7094 character	Print chains
00	`0`
01	`1`
02	`2`
03	`3`
04	`4`
05	`5`
06	`6`
07	`7`
10	`8`
11	`9`
12	`^`
13	`#` or `=`		`#` in A, `=` in H
14	`@` or `'`		`@` in A, `'` in H
15	`:`		Blank in A, H 48 char
16	`>`		Blank in A, H 48 char
17	`{`	Tape mark	Blank in A, H 48 char
20	`&` or `+`		`&` in A, `+` in H
21	`A`
22	`B`
23	`C`
24	`D`
25	`E`
26	`F`
27	`G`
30	`H`
31	`I`
32	`?`
33	`.`
34	`)`
35	`[`		Blank in A, H 48 char
36	`<`		Blank in A, H 48 char
37	`}`	Group mark	Blank in A, H 48 char
40	`-`
41	`J`
42	`K`
43	`L`
44	`M`
45	`N`
46	`O`
47	`P`
50	`Q`
51	`R`
52	`!`
53	`$`
54	`*`
55	`]`		Blank in A, H 48 char
56	`;`		Blank in A, H 48 char
57	`_`	Delta	Blank in A, H 48 char
60	Space
61	`/`
62	`S`
63	`T`
64	`U`
65	`V`
66	`W`
67	`X`
70	`Y`
71	`Z`
72	`\|`	Record mark
73	`,`
74	`%` or `(`		`%` in A, `(` in H
75	`~`		Blank in A, H 48 char
76	`\`		Blank in A, H 48 char
77	`"`		Blank in A, H 48 char

BCD code	ASCII representation	IBM 7094 character	Print chains
00	Space
01	`1`
02	`2`
03	`3`
04	`4`
05	`5`
06	`6`
07	`7`
10	`8`
11	`9`
12	`0`
13	`#` or `=`		`#` in A, `=` in H
14	`@` or `'`		`@` in A, `'` in H
15	`:`		Blank in A, H 48 char
16	`>`		Blank in A, H 48 char
17	`{`	Tape mark	Blank in A, H 48 char
20	`^`		Blank in A, H 48 char
21	`/`
22	`S`
23	`T`
24	`U`
25	`V`
26	`W`
27	`X`
30	`Y`
31	`Z`
32	`\|`	Record mark
33	`,`
34	`%` or `(`		`%` in A, `(` in H
35	`~`		Blank in A, H 48 char
36	`\`		Blank in A, H 48 char
37	`"`		Blank in A, H 48 char
40	`-`
41	`J`
42	`K`
43	`L`
44	`M`
45	`N`
46	`O`
47	`P`
50	`Q`
51	`R`
52	`!`
53	`$`
54	`*`
55	`]`		Blank in A, H 48 char
56	`;`	Delta	Blank in A, H 48 char
57	`_`		Blank in A, H 48 char
60	`&`
61	`A`
62	`B`
63	`C`
64	`D`
65	`E`
66	`F`
67	`G`
70	`H`
71	`I`
72	`?`
73	`.`
74	`)`
75	`[`		Blank in A, H 48 char
76	`<`		Blank in A, H 48 char
77	`}`	Group mark	Blank in A, H 48 char

1. IBM 7090/7094 simulator usage¶

1.1. Simulator files¶

1.2. IBM 7090/7094 features¶

1.2.1. CPU¶

1.2.2. Interval timer (`CLK`)¶

1.2.3. I/O channels (`CHANA`..`CHANH`)¶

1.2.4. Channel A devices¶

1.2.4.1. 711 card reader (`CDR`)¶

1.2.4.2. 721 card punch (`CDP`)¶

1.2.4.3. 716 line printer (`LPT`)¶

1.2.5. 729 magnetic tape (`MTA`…`MTH`)¶

1.2.6. 7631 file control (`DSK`)¶

1.2.7. 7289 high-speed drum (`DRM`)¶

1.2.8. 7750 communications controller (`COM` and `COML`)¶

1.3. Symbolic display and input¶

1.4. Character sets¶

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Related Topics

1. IBM 7090/7094 simulator usage¶

1.1. Simulator files¶

1.2. IBM 7090/7094 features¶

1.2.1. CPU¶

1.2.2. Interval timer (CLK)¶

1.2.3. I/O channels (CHANA..CHANH)¶

1.2.4. Channel A devices¶

1.2.4.1. 711 card reader (CDR)¶

1.2.4.2. 721 card punch (CDP)¶

1.2.4.3. 716 line printer (LPT)¶

1.2.5. 729 magnetic tape (MTA…MTH)¶

1.2.6. 7631 file control (DSK)¶

1.2.7. 7289 high-speed drum (DRM)¶

1.2.8. 7750 communications controller (COM and COML)¶

1.3. Symbolic display and input¶

1.4. Character sets¶

1.2.2. Interval timer (`CLK`)¶

1.2.3. I/O channels (`CHANA`..`CHANH`)¶

1.2.4.1. 711 card reader (`CDR`)¶

1.2.4.2. 721 card punch (`CDP`)¶

1.2.4.3. 716 line printer (`LPT`)¶

1.2.5. 729 magnetic tape (`MTA`…`MTH`)¶

1.2.6. 7631 file control (`DSK`)¶

1.2.7. 7289 high-speed drum (`DRM`)¶

1.2.8. 7750 communications controller (`COM` and `COML`)¶