Difference between revisions of "PDP-11/40"
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The '''PDP-11/40''', introduced in 1973, was the second machine to support 18-bit [[main memory]] [[address]]ing on the [[PDP-11]] platform, after the [[PDP-11/45]] (albeit with a subset of the [[PDP-11 Memory Management]] [[architecture]]). The [[Original Equipment Manufacturer|OEM]] version of the -11/40 is the '''PDP-11/35'''; the machines are completely identical, except for the printing on the [[front panel]] inlay. | The '''PDP-11/40''', introduced in 1973, was the second machine to support 18-bit [[main memory]] [[address]]ing on the [[PDP-11]] platform, after the [[PDP-11/45]] (albeit with a subset of the [[PDP-11 Memory Management]] [[architecture]]). The [[Original Equipment Manufacturer|OEM]] version of the -11/40 is the '''PDP-11/35'''; the machines are completely identical, except for the printing on the [[front panel]] inlay. | ||
| − | It used the [[KD11-A CPU]], which connected to the [[KY11-D Console|KY11-D]] front panel via a pair of BC08-R [[flat cable]]s. | + | It used the [[KD11-A CPU]], which connected to the [[KY11-D Console|KY11-D]] front panel via a pair of BC08-R [[flat cable]]s. Optional additions to the [[Central Processing Unit|CPU]] included: |
| + | |||
| + | * [[KT11-D Memory Management]] | ||
| + | * [[KE11-E Extended Instruction Set]] ([[PDP-11 Extended Instruction Set|EIS]]) | ||
| + | * [[KE11-F Floating Instruction Set]] ([[FIS floating point]] | ||
| + | * [[KJ11-A Stack Limit Register]] | ||
| + | * [[KW11-L Line Time Clock]] | ||
It came in two types of [[mounting box]]es: the 21" [[BA11-F Mounting Box]] (usual for the -11/40); and the 10-1/2" [[BA11-D Mounting Box]] (early units) and [[BA11-K Mounting Box]]es (later units) (usual for the -11/35). | It came in two types of [[mounting box]]es: the 21" [[BA11-F Mounting Box]] (usual for the -11/40); and the 10-1/2" [[BA11-D Mounting Box]] (early units) and [[BA11-K Mounting Box]]es (later units) (usual for the -11/35). | ||
| − | An -11/40 with a special blue front panel was used as the [[front end]] for the [[KL10]] | + | An -11/40 with a special blue-themed front panel was used as the [[front end]] for the [[KL10]] CPU in [[DECsystem-10]]s and [[DECSYSTEM-20]]s - though the -11/40 panel was hidden behind a cabinet door on the -20. |
The 11/40 was also a primary platform for early [[UNIX]]. | The 11/40 was also a primary platform for early [[UNIX]]. | ||
Revision as of 16:43, 9 March 2022
| PDP-11/40 | |
 PDP-11/40 with TU56 dual DECtape drive. | |
| Manufacturer: | DEC |
|---|---|
| Year Introduced: | January, 1973 |
| Word Size: | 16 bits |
| CPU: | KD11-A |
| Physical Address Size: | 18 bits |
| Virtual Address Size: | 16 bits |
| Bus Architecture: | UNIBUS |
The PDP-11/40, introduced in 1973, was the second machine to support 18-bit main memory addressing on the PDP-11 platform, after the PDP-11/45 (albeit with a subset of the PDP-11 Memory Management architecture). The OEM version of the -11/40 is the PDP-11/35; the machines are completely identical, except for the printing on the front panel inlay.
It used the KD11-A CPU, which connected to the KY11-D front panel via a pair of BC08-R flat cables. Optional additions to the CPU included:
- KT11-D Memory Management
- KE11-E Extended Instruction Set (EIS)
- KE11-F Floating Instruction Set (FIS floating point
- KJ11-A Stack Limit Register
- KW11-L Line Time Clock
It came in two types of mounting boxes: the 21" BA11-F Mounting Box (usual for the -11/40); and the 10-1/2" BA11-D Mounting Box (early units) and BA11-K Mounting Boxes (later units) (usual for the -11/35).
An -11/40 with a special blue-themed front panel was used as the front end for the KL10 CPU in DECsystem-10s and DECSYSTEM-20s - though the -11/40 panel was hidden behind a cabinet door on the -20.
The 11/40 was also a primary platform for early UNIX.
Configuration changes
Early versions of the BA11-F in the -11/40 omitted the 4 fans at the bottom of the pull-out used to house the CPU, and had only the 5 fans at the top.
The BA11-D used 9-pin DEC power distribution connectors, whereas the BA11-K used the 6-pin/15-pin pair, so presumably the backplane for the BA11-D had a different power harness than the one for the BA11-K (which it is confirmed had the 6/15-pin connectors).
The power harness from the H742 Power Supply was also different in later models, allowing use of an H754 +20V, -5V Regulator which provided +20V, for use with the MM11-U core memory.
hampage.hu
Quoting...
The /40 was introduced in January, 1973. It was a higher performance version of the /20, with a microcoded multi-board CPU. 18-bit MMU (-> max. 128 kw memory), FPU and EIS/FIS (extended/floating point instruction set) were available options.
There was a 'graphical' workstation model of the /40, using a VT11 Graphic Display Processor, marketed as the GT44. Many /40s were used in DECsystem-10's (KL10's, to be exact), as the frontend/IO-processor. These were painted differently, the panel looks awsome in blue too. (no, it's not just the frontpanel, that I like about the -11...)
On the picture to the left we can see two RK05's (disk pack drives) and two TU60 (DECcasette) units.
OS's at this point: DOS/BATCH, RSX11, RT-11, RSTS.
Trivia: The 11/40 was one of the most often "cloned" machine. the soviet/tscech/polish SM-4 (CM-4), the hungarian TPA-1140 are all copies of this computer.
See also
External links
- PDP-11/40 system manual (DEC-11-H40SA-A-D)
- PDP-11/40, -11/35 (21 inch chassis) system manual (EK-11040-TM-002)
- PDP-11/40 system engineering drawings
| v • d • e PDP-11 Computers and Peripherals |
|---|
| UNIBUS PDP-11s - PDP-11/20 • PDP-11/15 • PDP-11/35 • PDP-11/40 • PDP-11/45 • PDP-11/50 • PDP-11/55 • PDP-11/70 PDP-11/05 • PDP-11/10 • PDP-11/04 • PDP-11/34 • PDP-11/60 • PDP-11/44 • PDP-11/24 • PDP-11/84 • PDP-11/94 QBUS PDP-11s - PDP-11/03 • PDP-11/23 • PDP-11/23+ • MicroPDP-11/73 • MicroPDP-11/53 • MicroPDP-11/83 • MicroPDP-11/93 QBUS CPUs: LSI-11 • LSI-11/2 • KDF11-A • KDF11-B • KDJ11-A • KDJ11-B • KDJ11-D • KDJ11-E Buses: UNIBUS • UNIBUS map • SPC • MUD • EUB • QBUS • CD interconnect • PMI Also: PDP-11 architecture • PDP-11 Extended Instruction Set • FP11 floating point • PDP-11 Memory Management |
| UNIBUS CPUs: KA11 • KC11 • KB11-A • KB11-B • KB11-C • KB11-D • KD11-A • KD11-B • KD11-D • KD11-E • KD11-EA • KD11-K • KD11-Z • KDF11-U
Co-processors: FP11-A • FP11-B • FP11-C • FP11-E • FP11-F • KE44-A • FPF11 Chips: LSI-11 • KEV11-A • KEV11-B • KEV11-C • F-11 • KEF11-A • KTF11-A • T-11 • J-11 • FPJ11 CPU options: KE11-E • KE11-F • KJ11-A • KT11-C • KT11-D • KK11-A • KK11-B • KT24 • KTJ11-B Rare CPU options: KS11 Memory Protection and Relocation option • KT11-B Paging Option • KUV11 Writeable Control Store Front panels: KY11-A • KY11-D • KY11-J • KY11-LA • KY11-LB • KY11-P More on buses: UNIBUS and QBUS termination • Bus Arbitration on the Unibus and QBUS • CTI BUS PDT-11s - PDT-11/110 • PDT-11/130 • PDT-11/150 CTI PDP-11s - PRO-325 • PRO-350 • PRO-380 Other: FIS floating point • PDP-11 Commercial Instruction Set • PDP-11 stacks • PDP-11 family differences |
