Tandy 6000 Service Manual page 136

Service Manual
PAL 12L6 (UlO)
Pin Assignments:
READ CAO CAl CA2 CA3 CA4 CA5 CA6 CA7 GND
IORQ WRITE SELECT FB SYSCFG MEMCFG DMARD OPSCFG F8IO VCC
Equations:
/MEMCFG = CA7*CA6*CA5*CA4*CA3*CA2*CA1*CAO*/IORQ*/WRITE
SYSMCFG = CA7*CA6*CA5*CA4*CA3*/CA2*/CA1*CAO*/IORQ*/WRITE
F8 = CA7*CA6 *CA5 *CA4*CA3*/CA2*/CAl*/CAO */IORQ; DMA CHIP SELECT
DMARD = F8I0*/READ
/OPSCFG = CA7 */CA6 *CA5 */CA4 *CA3 */CA2 */CAl*/IORQ*/WRITE
/SELECT = CA7 *CA6 *CA5 *CA4 *CA3 *CA2 *CAl*CA0 */IORQ*/WRITE
+ CA7 *CA6 *CA5 *CA4 *CA3 */CA2 */CAl*CA0 */lORQ*/WRITE
+ CA7 *CA6*CA5*CA4*CA3 */CA2 */CAl*/CA0 */IORQ *
+ CA7 */CA6*CA5 */CA4 *CA3 */CA2 */CAl*/CA0 */IORQ*/WRITE
TANDY COMPUTER PRODUCTS
;DISABLE TRANSCEIVER DURING DMA I/O READ
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TANDY 6000/6000-HD
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;FF*IORQ/*WRITE/
;F9 *IORQ/*WRITE/
;MEMORY LOW, PAGE SWAP
;CPU GROUP I/O SELECT