Difference between revisions of "KD11-A CPU"

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Support for the [[PDP-11 Extended Instruction Set|EIS]] was optional, with the [[KE11-E Extended Instruction Set]], a hex card. There was also optional [[floating point]] hardware, the [[KE11-F Floating Instruction Set]], a quad card; it was not the full [[FP11 Floating Point]], but the minimal [[FIS floating point]].
 
Support for the [[PDP-11 Extended Instruction Set|EIS]] was optional, with the [[KE11-E Extended Instruction Set]], a hex card. There was also optional [[floating point]] hardware, the [[KE11-F Floating Instruction Set]], a quad card; it was not the full [[FP11 Floating Point]], but the minimal [[FIS floating point]].
  
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[[Memory management]] support was also optional, with the [[KT11-D Memory Management]], another hex card; it too was not the full [[PDP-11 Memory Management]], but the simplified subset.
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[[Memory management]] support was also optional, with the [[KT11-D Memory Management]], another hex card; it too was not the full [[PDP-11 Memory Management]], but the simplified subset. Other CPU options included the [[KJ11-A Stack Limit Register]], and the [[KW11-L Line Time Clock]] (the latter being a standard option across a number of PDP-11 CPUs).
  
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Other CPU options included the [[KJ11-A Stack Limit Register]], and the [[KW11-L Line Time Clock]] (the latter being a standard option across a number of PDP-11 CPUs).
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It used the [[KY11-D Programmer's Console|KY11-D]] [[front panel]]. Provision was also made for two optional [[KM11-A Maintenance Set]]s, one for the KD11-A itself, and one for the other parts of the CPU (KE11-E, etc).  
  
 
==Implementation==
 
==Implementation==
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* M7232 - μword
 
* M7232 - μword
  
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The [[Berg connector]]s on the M7232 carry the microcode bus to the KE11-E EIS card; note also the metal handle on this card, even though it is only a quad card; the only non-[[QBUS]] quad card with such a handle.
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The [[Berg connector]]s on the M7232 carry the microcode bus to the optional KE11-E EIS card; note also the metal edge handle on this card, even though it is only a quad card; it and the KE11-F FIS card are the only non-[[QBUS]] quad cards known to have  such a handle.
  
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All of them plugged into a [[wire-wrap]]ped custom [[backplane]] dual [[system unit]]. The KE11-E Extended Instruction Set, KE11-F Floating Instruction Set, and KT11-D Memory Management option cards all plugged into pre-wired slots in this backplane, as did the KJ11-A Stack Limit Register and the KW11-L Line Time Clock.
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All of them plugged into a [[wire-wrap]]ped custom 9-slot [[backplane]] dual [[system unit]]. The optional KE11-E Extended Instruction Set, KE11-F Floating Instruction Set, and KT11-D Memory Management option cards all plugged into pre-wired slots in this backplane, as did the KJ11-A Stack Limit Register and the KW11-L Line Time Clock. This left one unused slot, which was wired as a UNIBUS [[Small Peripheral Controller|SPC]] slot; that slot also contained the 'UNIBUS out'.
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Board locations are:
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<!-- (as seen from the board insertion side of the backplane, not the wire-wrap pin side, as is common in [[Digital Equipment Corporation|DEC]] documentation) -->
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{| class="wikitable"
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! !! colspan="6" | Connector
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|-
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! Slot !! A !! B !! C !! D !! E !! F
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|-
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| 1 || colspan="4" style="text-align:center;" | M7239 FIS || style="text-align:center;" | KM11-A (KT, KE) || style="text-align:center;" | KM11-A (KD)
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|-
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| 2 || colspan="6" style="text-align:center;" | M7238 EIS
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|-
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| 3 || colspan="4" style="text-align:center;" | M7232 u Word || style="text-align:center;" | KJ11-A || style="text-align:center;" | KW11-L
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|-
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| 4 || colspan="6" style="text-align:center;" | M7231 Data Path
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|-
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| 5 || colspan="6" style="text-align:center;" | M7233 IR Decode
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|-
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| 6 || colspan="6" style="text-align:center;" | M7235 Status
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|-
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| 7 || colspan="6" style="text-align:center;" | M7234 Timing
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|-
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| 8 || colspan="6" style="text-align:center;" | M7236 KT11-D
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|-
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| 9 || colspan="2" style="text-align:center;" | UNIBUS Out || colspan="4" style="text-align:center;" | SPC
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|}
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<!-- ==Further reading==
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-->
  
 
==External links==
 
==External links==
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* [http://www.bitsavers.org/pdf/dec/pdp11/1140/DEC-11-HKDAA-A-D_KD11-A_Processor_Manual.pdf KD11-A processor manual] (DEC-11-HKDAA-A-D)
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* [http://www.bitsavers.org/www.computer.museum.uq.edu.au/pdf/EK-KD11A-MM-001%20KD11-A%20Processor%20Maintenance%20Manual.pdf KD11-A processor maintenance manual] (EK-KD11A-MM-001)
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* [http://www.bitsavers.org/pdf/dec/pdp11/1140/PDP-1140_System_Engr_Drawings_Rev_P_Jun74.pdf PDP-11/40 system engineering drawings] (pp. 9-108 of the PDF)
 
* [https://loomcom.com/blog/0044_what_makes_a_pdp_11_35_tick.html What Makes A PDP-11/35 Tick?] - List of chips in the KD11-A
 
* [https://loomcom.com/blog/0044_what_makes_a_pdp_11_35_tick.html What Makes A PDP-11/35 Tick?] - List of chips in the KD11-A
  
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[[Category:PDP-11 Processors]]
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[[Category: PDP-11 UNIBUS Processors]]
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[[Category:UNIBUS Processors]]
 

Latest revision as of 04:52, 8 April 2024

The KD11-A PDP-11 CPU for the PDP-11/35 and PDP-11/40 was a multi-board micro-programmed processor.

Support for the EIS was optional, with the KE11-E Extended Instruction Set, a hex card. There was also optional floating point hardware, the KE11-F Floating Instruction Set, a quad card; it was not the full FP11 Floating Point, but the minimal FIS floating point.

Memory management support was also optional, with the KT11-D Memory Management, another hex card; it too was not the full PDP-11 Memory Management, but the simplified subset. Other CPU options included the KJ11-A Stack Limit Register, and the KW11-L Line Time Clock (the latter being a standard option across a number of PDP-11 CPUs).

It used the KY11-D front panel. Provision was also made for two optional KM11-A Maintenance Sets, one for the KD11-A itself, and one for the other parts of the CPU (KE11-E, etc).

Implementation

M7232 card from KD11-A

The basic KD11-A was contained on four hex cards:

  • M7231 - Data Paths
  • M7233 - IR Decode
  • M7234 - Timing
  • M7235 - Status

and one quad card:

  • M7232 - μword

The Berg connectors on the M7232 carry the microcode bus to the optional KE11-E EIS card; note also the metal edge handle on this card, even though it is only a quad card; it and the KE11-F FIS card are the only non-QBUS quad cards known to have such a handle.

All of them plugged into a wire-wrapped custom 9-slot backplane dual system unit. The optional KE11-E Extended Instruction Set, KE11-F Floating Instruction Set, and KT11-D Memory Management option cards all plugged into pre-wired slots in this backplane, as did the KJ11-A Stack Limit Register and the KW11-L Line Time Clock. This left one unused slot, which was wired as a UNIBUS SPC slot; that slot also contained the 'UNIBUS out'.

Board locations are:

Connector
Slot A B C D E F
1 M7239 FIS KM11-A (KT, KE) KM11-A (KD)
2 M7238 EIS
3 M7232 u Word KJ11-A KW11-L
4 M7231 Data Path
5 M7233 IR Decode
6 M7235 Status
7 M7234 Timing
8 M7236 KT11-D
9 UNIBUS Out SPC


External links

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