PC/XT

QUADBOARD MEMORY BANK ENABLING



TOTAL QUADBOARD     QUADBOARD SWITCH 1 POSITIONS

MEMORY              5         6         7         8

64K                 OFF       OFF       OFF       ON

128K                OFF       OFF       ON        ON

192K                OFF       ON        ON        ON

256K                ON        ON        ON        ON



See PC DIP switch settings for how to set the system

motherboard.



QUADBOARD MEMORY         QUADBOARD SWITCH 1 SETTINGS

STARTING ADDRESS         1         2         3         4

64K                       ON        ON        ON        OFF

128K                     ON        ON        OFF       ON

192K                     ON        ON        OFF       OFF

256K                     ON        OFF       ON        ON

320K                     ON        OFF       ON        OFF

384K                     ON        OFF       OFF       ON

448K                     ON        OFF       OFF       OFF

512K                     OFF       ON        ON        ON

576K                     OFF       ON        ON        OFF

640K                     OFF       ON        OFF       ON

704K                     OFF       ON        OFF       OFF

768K                     OFF       OFF       ON        ON

832K                     OFF       OFF       ON        OFF

896K                     OFF       OFF       OFF       ON

960K                     OFF       OFF       OFF       OFF



QUADBOARD SWITCH 2 SETTINGS



1 ON  -  MEMORY PARITY ENABLED 

1 OFF -  MEMORY PARITY DISABLED



2 ON  -  CLOCK ENABLED

2 OFF - CLOCK DISABLED

3 NOT USED



4 ON -   PARALLEL PORT ENABLED

4 OFF -  PARALLEL PORT DISABLED



5 OFF, 6 OFF - PARALLEL PORT DISABLED

5 OFF, 6 ON -  LPT1

5 ON,  6 OFF - LPT2

5 ON,  6 ON -  NOT USED



7 OFF, 8 OFF - SERIAL PORT DISABLED

7 OFF, 8 ON  - COM 2

7 ON,  8 OFF - COM 1

7 ON,  8 ON  -  NOT USED



AST SIX-PACK PLUS
Partial listing

Assumes 384K on adapter and 256K on system board (640K total)

Switch 1
(starting address 256K)
S1-1	OFF
S1-2	 ON
S1-2	 ON

PARITY CHECK ENABLE
S1-8	 ON

384K ON ADAPTER
S1-4	 ON
S1-5	 ON
S1-6	OFF

PIN 6
CLOCK 
ENABLE	ON

PIN 1 & PIN 2
COM SELECT

PIN 3 & PIN 4
INTERRUPT SELECT