Difference between revisions of "KDF11-A CPU"

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(Better picture, supported options)
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[[Image:KDF11-ATop.jpg|250px|thumb|right|M8186 CPU]]
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[[Image:KDF11-ATop.jpg|250px|thumb|right| CPU]]
  
The '''KDF11-A CPU''' is [[DEC card form factor|dual]]-width [[PDP-11]] [[Central Processing Unit|CPU]] card for the [[QBUS]]; it uses the same 'Fonz' [[F-11 chip set]] as the other [[KDF11 CPUs]].
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The '''KDF11-A CPU''' is [[PDP-11]] [[Central Processing Unit|CPU]] for the [[QBUS]]; it is a [[DEC card form factor|dual]]-width [[printed circuit board|card]], the M8186. It uses the same 'Fonz' [[F-11 chip set]] as the other [[KDF11 CPUs]].
  
It contains only the basic CPU, unlike the other KDF-11's: no [[Read-only memory|ROM]], no [[asynchronous serial line]]s, etc. It does support the optional [[KTF11-A memory management chip]] and the [[KEF11-A floating point chip]], but not the [[KEF11-B]] [[PDP-11 Commercial Instruction Set]] (CIS).
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It contains only the basic CPU, unlike the other KDF-11's: no [[Read-only memory|ROM]], no [[asynchronous serial line]]s, etc. It does support the optional [[KTF11-A memory management chip]] and the [[KEF11-A floating point chip]], but not the [[KEF11-B]] [[PDP-11 Commercial Instruction Set]] (CIS); for higher performance [[floating point]], the [[FPF11 floating point processor]] may be used.
  
The first version of the KDF11-A (Revision A) only suppported 256 Kbytes of [[main memory]]; later versions supported up to 4 Mbytes.
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The first version of the KDF11-A (Revision A) only suppported 256 Kbytes of [[main memory]]; later versions supported up to 4 Mbytes (but their [[QBUS CPU ODT|ODT]]'s are limited to 256 Kbytes). In the later models, a bit in the [[PDP-11 Memory Management#Control|SSR3]] CPU [[register]] must be set to allow use of more than 256 Kbytes.
  
{{semi-stub}}
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==Configuration==
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A limited amount of configuration can be done with a number of [[jumper]]s in various locations (which differ depending on  [[etch]] revision, with block of eleven in the middle of the card.Their functions are:
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{| border=1
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! Jumper !! Function !! In || Out
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|-
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|W1 || Master Clock || Enabled || Disabled
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|-
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|W2 || Reserved || Factory || Do not remove
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|-
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|W3 || Unknown
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|-
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|W4 || Event line || Disabled || Enabled
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|-
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|W5 || Powerup option bit 1
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|-
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|W6 || Powerup option bit 2
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|-
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|W7 || [[Halt]] enable || Halt || [[Trap]] to 4
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|-
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|W8 || [[Bootstrap]] [[address]] 0173000 || Yes || W9-W15
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|-
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|W09 || Bootstrap address bit 9 || 1 || 0
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|-
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|W10 || Bootstrap address bit 10 || 1 || 0
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|-
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|W11 || Bootstrap address bit 11 || 1 || 0
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|-
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|W12 || Bootstrap address bit 12 || 1 || 0
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|-
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|W13 || Bootstrap address bit 13 || 1 || 0
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|-
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|W14 || Bootstrap address bit 14 || 1 || 0
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|-
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|W15 || Bootstrap address bit 15 || 1 || 0
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|-
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|W16 || Reserved || Factory || Do not remove
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|-
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|W17 || Reserved || Factory || Do not remove
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|-
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|W18 || Wakeup circuit || Disabled || Enabled
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|}
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Powerup options are:
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{| border=1
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! W6 !! W5 !! Action
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|-
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| Out || Out || [[Program Counter|PC]] from 024, [[Processor Status Word|PS]] from 026
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|-
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| Out || In || ODT <!--, PS=0 -->
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|-
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| In || Out || PC=configuration jumpers <!--, PS=340 -->
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|-
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| In || In || Extended [[microcode]] (trap to 010 if none)
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|}
  
 
{{PDP-11}}
 
{{PDP-11}}

Latest revision as of 15:07, 22 May 2020

CPU

The KDF11-A CPU is PDP-11 CPU for the QBUS; it is a dual-width card, the M8186. It uses the same 'Fonz' F-11 chip set as the other KDF11 CPUs.

It contains only the basic CPU, unlike the other KDF-11's: no ROM, no asynchronous serial lines, etc. It does support the optional KTF11-A memory management chip and the KEF11-A floating point chip, but not the KEF11-B PDP-11 Commercial Instruction Set (CIS); for higher performance floating point, the FPF11 floating point processor may be used.

The first version of the KDF11-A (Revision A) only suppported 256 Kbytes of main memory; later versions supported up to 4 Mbytes (but their ODT's are limited to 256 Kbytes). In the later models, a bit in the SSR3 CPU register must be set to allow use of more than 256 Kbytes.

Configuration

A limited amount of configuration can be done with a number of jumpers in various locations (which differ depending on etch revision, with block of eleven in the middle of the card.Their functions are:

Jumper Function In Out
W1 Master Clock Enabled Disabled
W2 Reserved Factory Do not remove
W3 Unknown
W4 Event line Disabled Enabled
W5 Powerup option bit 1
W6 Powerup option bit 2
W7 Halt enable Halt Trap to 4
W8 Bootstrap address 0173000 Yes W9-W15
W09 Bootstrap address bit 9 1 0
W10 Bootstrap address bit 10 1 0
W11 Bootstrap address bit 11 1 0
W12 Bootstrap address bit 12 1 0
W13 Bootstrap address bit 13 1 0
W14 Bootstrap address bit 14 1 0
W15 Bootstrap address bit 15 1 0
W16 Reserved Factory Do not remove
W17 Reserved Factory Do not remove
W18 Wakeup circuit Disabled Enabled

Powerup options are:

W6 W5 Action
Out Out PC from 024, PS from 026
Out In ODT
In Out PC=configuration jumpers
In In Extended microcode (trap to 010 if none)