PDP-11/70
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| PDP-11/70 at the Living Computer Museum, Seattle (Joe Mabel, CC BY-SA 3.0) | |
| Specifications | |
|---|---|
| Manufacturer | Digital Equipment Corporation |
| Type | 16-bit minicomputer |
| Released | March 1975[1][2] |
| CPU | KB11-B (early) or KB11-C processor, Schottky TTL, with 2 KB cache[3][1] |
| Memory | Up to 4 MB on a private main memory bus: MJ11 core or MK11 MOS[1][3] |
| Storage | Up to four RH70 Massbus controllers (RP04, RS03 and RS04 discs, TU16 tape in DEC's manual)[3][1] |
| Display | — |
| Sound | — |
| Power | 861-D (120 V) or 861-E (240/415 V) three-phase power controls; two H7420 supplies in the processor cabinet[4] |
| OS / Firmware | — |
| Predecessor | PDP-11/45[1] |
| Successor | PDP-11/44[2] |
The PDP-11/70 is the largest of Digital Equipment Corporation's PDP-11 minicomputers, introduced in March 1975.[1] It takes the processor of the PDP-11/45 and adds a 2 KB cache, 22-bit physical addressing for up to 4 MB of memory on its own main memory bus, a Unibus map so that Unibus devices can reach all of that memory, and up to four RH70 Massbus controllers connecting fast disks and tapes directly to memory.[1][2] Early machines have the KB11-B processor and later ones the KB11-C; the difference is the floating-point option they take (FP11-B or FP11-C).[1][3]
A basic 11/70 is a double cabinet: the processor cabinet, with the CPU mounting box and two H7420 power supplies, and a memory cabinet with MJ11 core or MK11 MOS memory, each cabinet with its own 861 power control on a three-phase supply.[3][4] The processor cabinet alone holds up to eight H744 regulators and two 5411086 regulator boards, each set and checked at the processor backplane against DEC's tables.[4] See PDP-11/70 Power Supply Service, PDP-11/70 General Maintenance and PDP-11/70 Troubleshooting Guide.
Configuration
[edit | edit source]| Item | Contents |
|---|---|
| Processor cabinet | CPU mounting box with the KB11-B or KB11-C processor, DL11-A or DL11-W console interface, KW11-L line clock, M9301 or M9312 bootstrap; two H7420 power supplies with H744 +5 V regulators and 5411086 regulators; 861-D or 861-E power control |
| KB11-C processor modules | M8130 to M8145 (data paths, registers, IR decode, ROM control, Unibus and console control, timing generator, system status, Unibus map, cache control, address and data memory, cache data paths) and the 5411294 console module |
| Memory cabinet (MJ11) | Memory frame with MJ11 backplane, two H744 and two H754 regulators, AC input box with 5411086 power line monitor, M8147 or M8148 memory controller and M8149 transceiver; 16K-word (MJ11-A) or 32K-word (MJ11-B) core module sets |
| Memory cabinet (MK11) | Memory frame with MK11 backplane, one H7441 +5 V regulator, three 7014251 ±12 V/+5 V regulators, M8158 to M8161 interface and control modules, MS11-K MOS arrays, box controller and three battery backup units |
| Console | LA36 DECwriter II |
Power
[edit | edit source]The processor cabinet's 861 power control feeds the upper and lower H7420 supplies on separate phases. Each H7420 carries up to five H744 +5 V regulators and a 5411086 regulator board: the upper one makes +8 V and +15 V and the line clock signal, the lower one −15 V, and both monitor their supply for AC LO and DC LO.[4] The memory cabinet has its own 861 and a power supply in each memory frame.[4] Specifications and adjustments are on PDP-11/70 Power Supply Service.
Documentation
[edit | edit source]- PDP-11/70 Maintenance and Installation Manual, EK-11070-MM-002, May 1979: File:PDP-11-70 Maintenance and Installation Manual (EK-11070-MM-002).pdf
- 1170 Maintenance Service Guide, KA-K1170-MG-003, Digital Equipment of Canada, 1988: File:PDP-11-70 Maintenance Service Guide (KA-K1170-MG-003).pdf
Gallery
[edit | edit source]-
An H7420 with four H744 regulators (DEC)
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Related pages
[edit | edit source]- PDP-11/70 General Maintenance
- PDP-11/70 Troubleshooting Guide
- PDP-11/70 Power Supply Service
- PDP-11/70 Documentation
- PDP-11/44
References
[edit | edit source]- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 "PDP-11/70", Computer History Wiki, gunkies.org/wiki/PDP-11/70. Introduced March 1975; 11/45-derived CPU; 2 KB cache; 4 MB main memory bus; Unibus map; four RH70s; KB11-B and KB11-C; MJ11 and MK11 memory.
- ↑ 2.0 2.1 2.2 "PDP-11", Wikipedia, en.wikipedia.org/wiki/PDP-11, models list. PDP-11/70 (1975); PDP-11/44 as a replacement for the 11/45 and 11/70.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 Digital Equipment Corporation, PDP-11/70 Maintenance and Installation Manual, EK-11070-MM-002, May 1979, pp. 1-1 to 1-6, section 1.1 and Table 1-1 (File:PDP-11-70 Maintenance and Installation Manual (EK-11070-MM-002).pdf).
- ↑ 4.0 4.1 4.2 4.3 4.4 DEC, EK-11070-MM-002, pp. 4-1 to 4-4, sections 4.2 and 4.2.1 and Table 4-1, power system.