PCPI 88Card U52 Truth Tables

Reverse engineered Apple II hardware

PCPI 88Card U52 Truth Tables

Output O6 (pin 13, combinatorial)

/88INTA
(pin 8)		 LA15
(pin 1)		 LA14
(pin 2)		 LA13
(pin 3)		 LA12
(pin 4)		   O6
(pin 13)
0 0 0 0 0   0
0 0 0 0 1   0
0 0 0 1 0   0
0 0 0 1 1   0
0 0 1 0 0   0
0 0 1 0 1   0
0 0 1 1 0   0
0 0 1 1 1   0
0 1 0 0 0   0
0 1 0 0 1   0
0 1 0 1 0   0
0 1 0 1 1   0
0 1 1 0 0   0
0 1 1 0 1   0
0 1 1 1 0   0
0 1 1 1 1   0
1 0 0 0 0   1
1 0 0 0 1   1
1 0 0 1 0   1
1 0 0 1 1   1
1 0 1 0 0   1
1 0 1 0 1   1
1 0 1 1 0   1
1 0 1 1 1   1
1 1 0 0 0   1
1 1 0 0 1   1
1 1 0 1 0   1
1 1 0 1 1   0
1 1 1 0 0   0
1 1 1 0 1   0
1 1 1 1 0   1
1 1 1 1 1   1

Output /DMA_DATA_OUT (pin 14, combinatorial)

/DMA_CYCLE
(pin 5)		 /88WR
(pin 7)		   /DMA_DATA_OUT
(pin 14)
0 0   0
0 1   1
1 0   1
1 1   1

Output /DMA_DATA_IN (pin 15, combinatorial)

/88RD
(pin 6)		 /DRAM_SEL
(pin 9)		   /DMA_DATA_IN
(pin 15)
0 0   1
0 1   0
1 0   1
1 1   1

Output /ADDRHI_ADJ (pin 16, combinatorial)

LA15
(pin 1)		 LA14
(pin 2)		 LA13
(pin 3)		 LA12
(pin 4)		   /ADDRHI_ADJ
(pin 16)
0 0 0 0   1
0 0 0 1   1
0 0 1 0   1
0 0 1 1   1
0 1 0 0   1
0 1 0 1   1
0 1 1 0   1
0 1 1 1   1
1 0 0 0   1
1 0 0 1   1
1 0 1 0   1
1 0 1 1   1
1 1 0 0   1
1 1 0 1   1
1 1 1 0   0
1 1 1 1   1

Output O2 (pin 17, combinatorial)

  O2
(pin 17)
  1

Output /ADDRHI_CIN (pin 18, combinatorial)

LA15
(pin 1)		 LA14
(pin 2)		 LA13
(pin 3)		 LA12
(pin 4)		   /ADDRHI_CIN
(pin 18)
0 0 0 0   1
0 0 0 1   1
0 0 1 0   1
0 0 1 1   1
0 1 0 0   1
0 1 0 1   1
0 1 1 0   1
0 1 1 1   1
1 0 0 0   1
1 0 0 1   1
1 0 1 0   1
1 0 1 1   0
1 1 0 0   0
1 1 0 1   0
1 1 1 0   0
1 1 1 1   1