PC/XT
QUADBOARD AND AST SIX-PACK Plus Settings
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
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