Difference between revisions of "KD11-Z CPU"

From Computer History Wiki
Jump to: navigation, search
(Details: Add main backplane diagram)
(Hardware Details: +mounting box)
 
(3 intermediate revisions by the same user not shown)
Line 17: Line 17:
 
In addition, a single dual board, the M7090 Console Interface module, held a number of [[Berg connector]] headers used for various [[input/output]] functions.
 
In addition, a single dual board, the M7090 Console Interface module, held a number of [[Berg connector]] headers used for various [[input/output]] functions.
  
These were placed in a 14-slot CPU-specific [[backplane]], along with the optional FP11-F and KE44-A, and the main memory cards, leaving two slots (one [[Modified UNIBUS Device|MUD/SPC]] slot, and one [[Small Peripheral Controller|SPC]] slot, which also contained the 'UNIBUS out').
+
These were placed in a 14-slot CPU-specific [[backplane]], along with the optional FP11-F and KE44-A, and all the main memory cards (the EUB was only present on the main backplane), leaving two slots (one [[Modified UNIBUS Device|MUD/SPC]] slot, and one [[Small Peripheral Controller|SPC]] slot, which also contained the 'UNIBUS out').
  
 
Board locations are:
 
Board locations are:
Line 51: Line 51:
 
| 12 || colspan="6" style="text-align:center;" | M8722 MS11-M (optional)
 
| 12 || colspan="6" style="text-align:center;" | M8722 MS11-M (optional)
 
|-
 
|-
| 13 || Power ||   || colspan="4" style="text-align:center;" | SPC
+
| 13 || colspan="6" style="text-align:center;" | MUD/SPC
 
|-
 
|-
 
| 14 || colspan="2" style="text-align:center;" | UNIBUS Out || colspan="4" style="text-align:center;" | SPC
 
| 14 || colspan="2" style="text-align:center;" | UNIBUS Out || colspan="4" style="text-align:center;" | SPC
 
|}
 
|}
 +
 +
The details of how the EUB and UNIBUS interoperated are not yet clear (it is not covered in [[Digital Equipment Corporation|DEC]]'s documentation); it was almost certainly similar to that used in the [[PDP-11/24#Implementation details|-11/24]].
 +
 +
[[Image:1144Power.jpg|300px|thumb|right|PDP-11/44 setup]]
 +
 +
The standard [[mounting box]] for the CPU was the [[BA11-A mounting box|BA11-A]], which is unusual in that it does not use only the standard [[DEC power distribution connectors]]; it also provided special connections on [[bus bar]]s in its power supply, and the KD11-Z backplane uses unique [[Flexprint cable]]s for power, which go to the special connections (see image).
  
 
{{PDP-11}}
 
{{PDP-11}}

Latest revision as of 20:34, 19 February 2020

The KD11-Z CPU was the CPU of the PDP-11/44; the letter code 'Z' was a tip to the fact that it was the last native UNIBUS PDP-11 CPU, and the last to be made out of discrete chips, and not a microprocessor.

The KD11-Z used the Extended UNIBUS for its bus to main memory, allowing it to have up to 4 mega-bytes of main memory. All devices were attached to a semi-separate UNIBUS (it and the EUB shared data lines, but not address lines); DMA devices could gain access to the memory via a UNIBUS map which connected the two, and mapped UNIBUS addresses to main memory addresses.

Full PDP-11 Memory Management and a cache (the KK11-B) were standard on all KD11-Z's. It also supported the optional FP11-F floating point (full FP11 floating point) and/or the KE44-A Commercial Instruction Set Processor; these plugged into dedicated slots in the CPU backplane (it could work with either, or both).

Hardware Details

The basic KD11-Z CPU consisted of five hex boards:

  • M7094 Data Path module
  • M7095 Control module
  • M7096 Multifunction module
  • M7097 KK11-B Cache module
  • M7098 UNIBUS interface module

In addition, a single dual board, the M7090 Console Interface module, held a number of Berg connector headers used for various input/output functions.

These were placed in a 14-slot CPU-specific backplane, along with the optional FP11-F and KE44-A, and all the main memory cards (the EUB was only present on the main backplane), leaving two slots (one MUD/SPC slot, and one SPC slot, which also contained the 'UNIBUS out').

Board locations are:

Connector
Slot A B C D E F
1 M7090 CIM M7091 CIS
2 M7092 CIS
3 M7093 Floating point
4 M7094 Data paths
5 M7095 Control
6 M7096 MFM
7 M7097 Cache
8 M7098 UNIBUS interface
9 M8722 MS11-M
10 M8722 MS11-M (optional)
11 M8722 MS11-M (optional)
12 M8722 MS11-M (optional)
13 MUD/SPC
14 UNIBUS Out SPC

The details of how the EUB and UNIBUS interoperated are not yet clear (it is not covered in DEC's documentation); it was almost certainly similar to that used in the -11/24.

PDP-11/44 setup

The standard mounting box for the CPU was the BA11-A, which is unusual in that it does not use only the standard DEC power distribution connectors; it also provided special connections on bus bars in its power supply, and the KD11-Z backplane uses unique Flexprint cables for power, which go to the special connections (see image).