PAL20L10
ICP16_new_pal_U46
Z8002 PORT DECODER__ZIACK
INTEGRATED SOLUTIONS
ZST1 ZST0 /PTRSTAT ZST2 /ZAS LZA2 VRST ZST3 LZA1 ZDS /ZWR GND /SPRTCTL
/ZVIDEN /SPRTWR /FIFO_DS /SPRT0_RD /PTRSTAT_WR /I_O_DECODE /PTRSTAT_RD
/SPRT1_RD /FIFO_AS /ZNVICLR VCC

IF(VCC) /I_O_DECODE = /ZST0*ZST1*/ZST2*/ZST3*/VRST
IF(VCC) /FIFO_DS = ZDS + VRST
IF(VCC) /FIFO_AS = ZAS + VRST
IF(VCC) /PTRSTAT_RD = /ZWR*PTRSTAT*/VRST
IF(VCC) /PTRSTAT_WR = ZWR*PTRSTAT
IF(VCC) /SPRT0_RD = SPRTCTL*/LZA1*/LZA2*ZDS*/VRST
IF(VCC) /SPRT1_RD = SPRTCTL*LZA1*/LZA2*ZDS*/VRST
IF(VCC) /SPRTWR = SPRTCTL*/LZA1*LZA2*ZDS
IF(VCC) /ZNVICLR = /ZST0*ZST1*ZST2*/ZST3 + VRST
IF(VCC) /ZVIDEN = ZST0*ZST1*ZST2*/ZST3*ZDS*/VRST

DESCRIPTION

The above equations, 1, 9, and 10 use the Z8002 status lines to decode
I/O transactions, nonvectored, and vectored interrupts. Also decoded
are accesses to the Z8038 FIFO, printer status port, and the modem
control lines monitored and controlled by "SPRTx_xx".
