Difference between revisions of "KA11 changes for the KT11-B"

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(→‎Wires added: Add pin #)
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An M138 FLIP CHIP (octal three-input NAND gates) is also plugged into the KA11 backplane (in slot B08, otherwise unused), to provide additional gates.
 
An M138 FLIP CHIP (octal three-input NAND gates) is also plugged into the KA11 backplane (in slot B08, otherwise unused), to provide additional gates.
  
−
The following list of wiring changes on the KA11 backplane is drawn from print 7605961-0-11, "KA11 Mods For Use With KT11-B". All wires are listed as being 30 AWG. ('''Note:''' This print reproduced poorly, so there may be transcription errors (e.g. '8' for '3', etc.)
+
===Wires removed===
  
−
===Wires removed===
+
The following lists of wiring changes on the KA11 backplane give the content from print 7605961-0-11, "KA11 Mods For Use With KT11-B". All wires are listed as being 30 AWG.
 +
 
 +
'''Note:''' This print reproduced poorly, so there may be transcription errors (e.g. '8' for '3', etc). '?' indicates an un-readable character. Text in ''italics'' are comments added during transcription to this page.
  
 
{| class="wikitable"
 
{| class="wikitable"
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===Wires added===
 
===Wires added===
  
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All added wires are listed as Orange. This list had previously been checked, and annotated by hand in ink; those annotations are given here. All entries with no annotation given have a hand-written check-mark in ink. '?' indicates an un-readable character.
+
All added wires are listed as Orange. This list had previously been checked, and annotated by hand in ink; those annotations are given here. All entries with no annotation given have a hand-written check-mark in ink.
  
 
{| class="wikitable"
 
{| class="wikitable"
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| E03F1 || B08M1 || K1-2 SCLK L || E04L1 - B08M1
 
| E03F1 || B08M1 || K1-2 SCLK L || E04L1 - B08M1
 
|-
 
|-
−
| B08J1 || B08K1 || B08J1 || rowspan="6" style="text-align:center;" |
+
| B08J1 || B08K1 || B08J1 || rowspan="12" style="text-align:center;" |
 
|-
 
|-
 
| B08J1 || C06J1 || B08J1
 
| B08J1 || C06J1 || B08J1
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| B09D1 || B08F2 || D18 - PGC 04 (1) H
 
| B09D1 || B08F2 || D18 - PGC 04 (1) H
 
|-
 
|-
−
| xx || yy || B08H2
+
| B08H2 || B08J2 || B08H2
 
|-
 
|-
−
| xx || yy || B08H2
+
| B08H2 || B0K2 || B08H2 || (''Presumably 'B0K2' is a typo for 'B08K2''')
 
|-
 
|-
−
| xx || yy || B08H2
+
| B08H2 || B08L2 || B08H2 || rowspan="3" style="text-align:center;" |
 
|-
 
|-
−
| xx || yy || B08H2
+
| B08H2 || E07P2 || B08H2
 
|-
 
|-
−
| xx || yy || K1-4 SERVICE H
+
| D03T2 || B08R2 || K1-4 SERVICE H
 
|-
 
|-
−
| xx || yy || K1-3 ISR (3+7) H || None
+
| E03L2 || B08N2 || K1-3 ISR (3+7) H || None
 
|-
 
|-
−
| xx || yy || B08S2 || rowspan="3" style="text-align:center;" |
+
| B08S2 || B08T2 || B08S2 || rowspan="3" style="text-align:center;" |
 
|-
 
|-
−
| xx || yy || B08S2
+
| B08S2 || B08U2 || B08S2
 
|-
 
|-
−
| xx || yy || B08S2
+
| B08S2 || B08V2 || B08S2
 
|-
 
|-
−
| xx || yy || K12-3 TRAPS || B02C1 - B08P2
+
| D11B2 || B08P2 || K12-3 TRAPS || B02C1 - B08P2
 
|-
 
|-
−
| xx || yy || K1-3 B DEST (0) H ||
+
| F03J1 || B09E1 || K1-3 B DEST (0) H ||
 
|-
 
|-
−
| xx || yy || K1-4 B SOURCE (1) H || B09H1 - F11M2
+
| F03M2 || B09M2 || K1-4 B SOURCE (1) H || B09H1 - F11M2
 
|-
 
|-
−
| xx || yy || K1-3 ISR 12 L || rowspan="5" style="text-align:center;" |
+
| E03R1 || B09J1 || K1-3 ISR 12 L || rowspan="5" style="text-align:center;" |
 
|-
 
|-
−
| xx || yy || K1-3 ISR 7 L
+
| E03K1 || B09L1 || K1-3 ISR 7 L
 
|-
 
|-
−
| xx || yy || K10-4 RTI H
+
| F04S2 || B09M1 || K10-4 RTI H
 
|-
 
|-
−
| xx || yy || K10-2 JSR H
+
| C04D1 || B09P1 || K10-2 JSR H
 
|-
 
|-
−
| xx || yy || D18 CLK NPR H
+
| B09S1 || F02U2 || D18 CLK NPR H
 
|-
 
|-
 
| xx || yy || K10-3 RTS || B09D2 - E11T2
 
| xx || yy || K10-3 RTS || B09D2 - E11T2

Revision as of 02:48, 25 August 2016

The KT11-B Paging Option for the PDP-11/20 involves some modifications to the KA11 CPU. Those changes are documented in a DEC print set, 7605961-0, "Central Processor for KT11-B".

Alas, there's only one known set of these prints for the KT11-B changes to the KA11 - and that set is missing a page: "PC Board Modifications", D-AP-7605961-0-10.

Luckily, there is probably just duplicate information elsewhere (including a hand-modified set of KA11 prints, showing the changes to suppport the KT11-B) to allow it to be reproduced.

Print set

The following prints are included in the "Central Processor for KT11-B" set:

Drawing Sheets Title
D-CS-7605961-0-3 3 State Control - M727 K2
D-CS-7605961-0-4 3 Priority - M824 K3
D-CS-7605961-0-5 5 Bus Interface & Instruction Register - M725 K9
D-CS-7605961-0-6 4 Instruction Register Decode - M726 K10
D-CS-7605961-0-7 3 Flag Control - M822 K12
D-CS-7605961-0-8 4 Bus & Console Control - M724 K13

KA/KT Interface

The KA11 and KT11-B are connected by a single cable which carries specific signals, as well as the UNIBUS. On the KT11 end, it plugs into slot D12, and on the KA11 end, into slot B09. The cable pinout is:

Pin Source Signal  ! Pin Source Signal
A1 - Ground A2  ? xx
B1 KA11 Odd address error B2  ? xx
C1 - Ground C2 - Ground
D1 KT11 PGC 04 D2 KA11 RTS
E1 KA11 DEST E2 KA11 CLKT
F1 - Ground F2 - Ground
H1 KA11 SOURCE H2 KA11 -TRAPS
J1 KA11 ISR 12 J2 - Ground
K1 - Ground K2 KA11 SERVICE
L1 KA11 ISR 7 L2 - Ground
M1 KA11 -RTI M2 KA11 TIME OUT
N1 - Ground N2 - Ground
P1 KA11 JSR P2 KA11 FETCH
R1 - Ground R2 - Ground
S1 KT11 CLK NPR S2 KA11 TRAP
T1 - Ground T2 KA11 [ST+SR] K13-3
U1  ? xx U2 - Ground
V1  ? xx V2 KT11 Force timeout

(Signals partially in lower case are not formal names from the prints, but give a sense of what the signal does.)

KA11 modifications

An M138 FLIP CHIP (octal three-input NAND gates) is also plugged into the KA11 backplane (in slot B08, otherwise unused), to provide additional gates.

Wires removed

The following lists of wiring changes on the KA11 backplane give the content from print 7605961-0-11, "KA11 Mods For Use With KT11-B". All wires are listed as being 30 AWG.

Note: This print reproduced poorly, so there may be transcription errors (e.g. '8' for '3', etc). '?' indicates an un-readable character. Text in italics are comments added during transcription to this page.

From To Signal Colour
B02T2 F08U2 K13-3 B MSYN H Orange
D12C2 D12S1 GND 12
E04K1 E07P2 K10-4 CLKT H
E03F1 E04L1 K?-2 SCLK L
D11B1 C06J1 K10-3 ODD ADRS ERR L
C06J1 D02N1 K10-3 ODD ADRS ERR L
D12S1 D12T1 GND 12 Brown

Wires added

All added wires are listed as Orange. This list had previously been checked, and annotated by hand in ink; those annotations are given here. All entries with no annotation given have a hand-written check-mark in ink.

From To Signal Comment
E03F1 F06H1 K1-2 SCLK L
D?2C2 D12T1 GND 12 None
D11B1 D02N1 K10-3 ODD ADDRS ERR L None
F04P2 B08A1 K10-2 ODD ADDRS ERR L
F04P2 B08B1 K10-2 ODD ADDRS ERR L
F04P2 B08C1 K10-2 ODD ADDRS ERR L
B08D1 B08E1 B08D1
B08D1 B08L1 B08D1
E03F1 B08M1 K1-2 SCLK L E04L1 - B08M1
B08J1 B08K1 B08J1
B08J1 C06J1 B08J1
B08N1 B09B1 B08N1
E04K1 B08P1 K10-2 CLKT H
E04K1 B08R1 K10-2 CLKT H
E04K1 B08S1 K10-2 CLKT H
B08U1 B08D2 B08U1
B08U1 B08F2 B08U1
B09D1 B08F1 D18 - PGC 04 (1) H
B09D1 B08H1 D18 - PGC 04 (1) H
B09D1 B08F2 D18 - PGC 04 (1) H
B08H2 B08J2 B08H2
B08H2 B0K2 B08H2 (Presumably 'B0K2' is a typo for 'B08K2')
B08H2 B08L2 B08H2
B08H2 E07P2 B08H2
D03T2 B08R2 K1-4 SERVICE H
E03L2 B08N2 K1-3 ISR (3+7) H None
B08S2 B08T2 B08S2
B08S2 B08U2 B08S2
B08S2 B08V2 B08S2
D11B2 B08P2 K12-3 TRAPS B02C1 - B08P2
F03J1 B09E1 K1-3 B DEST (0) H
F03M2 B09M2 K1-4 B SOURCE (1) H B09H1 - F11M2
E03R1 B09J1 K1-3 ISR 12 L
E03K1 B09L1 K1-3 ISR 7 L
F04S2 B09M1 K10-4 RTI H
C04D1 B09P1 K10-2 JSR H
B09S1 F02U2 D18 CLK NPR H
xx yy K10-3 RTS B09D2 - E11T2
xx yy K1-4 SERVICE L
xx yy K13-3 TIME OUT (0) H
xx yy K1-4 FETCH (0) H
xx yy K10-2 TRAP L
xx yy K13-3 -(ST+SR) H D06D2 - B11T2
xx yy D18 FORCE TIMEOUT H
xx yy B08V1
xx yy K2-3 CLR PTR L None
xx yy K2-3 PERIF REL L None
xx yy DEVICE 2+3 BG06
xx yy K1-2 R/W2 H
xx yy B08M2
F02J1 C06V1 - Unlisted (Not in original table; added by hand)
B09H1 F11M2 -
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