Output O1 (DATAIN_EN)

Reverse engineered Apple II hardware

Output O1 (DATAIN_EN)

Truth table

I1 I2 I3 I4 I7 I8 I9 I10   O1
0 0 0 0 0 0 0 0   1
0 0 0 0 0 0 0 1   1
0 0 0 0 0 0 1 0   1
0 0 0 0 0 0 1 1   1
0 0 0 0 0 1 0 0   1
0 0 0 0 0 1 0 1   1
0 0 0 0 0 1 1 0   1
0 0 0 0 0 1 1 1   1
0 0 0 0 1 0 0 0   1
0 0 0 0 1 0 0 1   1
0 0 0 0 1 0 1 0   1
0 0 0 0 1 0 1 1   1
0 0 0 0 1 1 0 0   1
0 0 0 0 1 1 0 1   1
0 0 0 0 1 1 1 0   1
0 0 0 0 1 1 1 1   1
0 0 0 1 0 0 0 0   1
0 0 0 1 0 0 0 1   1
0 0 0 1 0 0 1 0   1
0 0 0 1 0 0 1 1   1
0 0 0 1 0 1 0 0   1
0 0 0 1 0 1 0 1   1
0 0 0 1 0 1 1 0   1
0 0 0 1 0 1 1 1   1
0 0 0 1 1 0 0 0   1
0 0 0 1 1 0 0 1   1
0 0 0 1 1 0 1 0   1
0 0 0 1 1 0 1 1   1
0 0 0 1 1 1 0 0   1
0 0 0 1 1 1 0 1   1
0 0 0 1 1 1 1 0   1
0 0 0 1 1 1 1 1   1
0 0 1 0 0 0 0 0   1
0 0 1 0 0 0 0 1   1
0 0 1 0 0 0 1 0   1
0 0 1 0 0 0 1 1   1
0 0 1 0 0 1 0 0   1
0 0 1 0 0 1 0 1   1
0 0 1 0 0 1 1 0   1
0 0 1 0 0 1 1 1   1
0 0 1 0 1 0 0 0   1
0 0 1 0 1 0 0 1   1
0 0 1 0 1 0 1 0   1
0 0 1 0 1 0 1 1   1
0 0 1 0 1 1 0 0   1
0 0 1 0 1 1 0 1   1
0 0 1 0 1 1 1 0   1
0 0 1 0 1 1 1 1   1
0 0 1 1 0 0 0 0   1
0 0 1 1 0 0 0 1   1
0 0 1 1 0 0 1 0   1
0 0 1 1 0 0 1 1   1
0 0 1 1 0 1 0 0   1
0 0 1 1 0 1 0 1   1
0 0 1 1 0 1 1 0   1
0 0 1 1 0 1 1 1   1
0 0 1 1 1 0 0 0   1
0 0 1 1 1 0 0 1   1
0 0 1 1 1 0 1 0   1
0 0 1 1 1 0 1 1   1
0 0 1 1 1 1 0 0   1
0 0 1 1 1 1 0 1   1
0 0 1 1 1 1 1 0   1
0 0 1 1 1 1 1 1   1
0 1 0 0 0 0 0 0   1
0 1 0 0 0 0 0 1   1
0 1 0 0 0 0 1 0   1
0 1 0 0 0 0 1 1   1
0 1 0 0 0 1 0 0   1
0 1 0 0 0 1 0 1   1
0 1 0 0 0 1 1 0   1
0 1 0 0 0 1 1 1   1
0 1 0 0 1 0 0 0   1
0 1 0 0 1 0 0 1   1
0 1 0 0 1 0 1 0   1
0 1 0 0 1 0 1 1   1
0 1 0 0 1 1 0 0   1
0 1 0 0 1 1 0 1   1
0 1 0 0 1 1 1 0   1
0 1 0 0 1 1 1 1   1
0 1 0 1 0 0 0 0   1
0 1 0 1 0 0 0 1   1
0 1 0 1 0 0 1 0   1
0 1 0 1 0 0 1 1   1
0 1 0 1 0 1 0 0   1
0 1 0 1 0 1 0 1   1
0 1 0 1 0 1 1 0   1
0 1 0 1 0 1 1 1   1
0 1 0 1 1 0 0 0   1
0 1 0 1 1 0 0 1   1
0 1 0 1 1 0 1 0   1
0 1 0 1 1 0 1 1   1
0 1 0 1 1 1 0 0   1
0 1 0 1 1 1 0 1   1
0 1 0 1 1 1 1 0   1
0 1 0 1 1 1 1 1   1
0 1 1 0 0 0 0 0   1
0 1 1 0 0 0 0 1   1
0 1 1 0 0 0 1 0   1
0 1 1 0 0 0 1 1   1
0 1 1 0 0 1 0 0   1
0 1 1 0 0 1 0 1   1
0 1 1 0 0 1 1 0   1
0 1 1 0 0 1 1 1   1
0 1 1 0 1 0 0 0   1
0 1 1 0 1 0 0 1   1
0 1 1 0 1 0 1 0   1
0 1 1 0 1 0 1 1   1
0 1 1 0 1 1 0 0   1
0 1 1 0 1 1 0 1   1
0 1 1 0 1 1 1 0   1
0 1 1 0 1 1 1 1   1
0 1 1 1 0 0 0 0   1
0 1 1 1 0 0 0 1   1
0 1 1 1 0 0 1 0   1
0 1 1 1 0 0 1 1   1
0 1 1 1 0 1 0 0   1
0 1 1 1 0 1 0 1   1
0 1 1 1 0 1 1 0   1
0 1 1 1 0 1 1 1   1
0 1 1 1 1 0 0 0   1
0 1 1 1 1 0 0 1   1
0 1 1 1 1 0 1 0   1
0 1 1 1 1 0 1 1   1
0 1 1 1 1 1 0 0   1
0 1 1 1 1 1 0 1   1
0 1 1 1 1 1 1 0   1
0 1 1 1 1 1 1 1   1
1 0 0 0 0 0 0 0   1
1 0 0 0 0 0 0 1   1
1 0 0 0 0 0 1 0   1
1 0 0 0 0 0 1 1   1
1 0 0 0 0 1 0 0   1
1 0 0 0 0 1 0 1   1
1 0 0 0 0 1 1 0   1
1 0 0 0 0 1 1 1   1
1 0 0 0 1 0 0 0   1
1 0 0 0 1 0 0 1   1
1 0 0 0 1 0 1 0   1
1 0 0 0 1 0 1 1   1
1 0 0 0 1 1 0 0   1
1 0 0 0 1 1 0 1   0
1 0 0 0 1 1 1 0   1
1 0 0 0 1 1 1 1   1
1 0 0 1 0 0 0 0   1
1 0 0 1 0 0 0 1   1
1 0 0 1 0 0 1 0   1
1 0 0 1 0 0 1 1   1
1 0 0 1 0 1 0 0   1
1 0 0 1 0 1 0 1   1
1 0 0 1 0 1 1 0   1
1 0 0 1 0 1 1 1   1
1 0 0 1 1 0 0 0   1
1 0 0 1 1 0 0 1   1
1 0 0 1 1 0 1 0   1
1 0 0 1 1 0 1 1   1
1 0 0 1 1 1 0 0   1
1 0 0 1 1 1 0 1   1
1 0 0 1 1 1 1 0   1
1 0 0 1 1 1 1 1   1
1 0 1 0 0 0 0 0   1
1 0 1 0 0 0 0 1   1
1 0 1 0 0 0 1 0   1
1 0 1 0 0 0 1 1   1
1 0 1 0 0 1 0 0   1
1 0 1 0 0 1 0 1   1
1 0 1 0 0 1 1 0   1
1 0 1 0 0 1 1 1   1
1 0 1 0 1 0 0 0   1
1 0 1 0 1 0 0 1   1
1 0 1 0 1 0 1 0   1
1 0 1 0 1 0 1 1   1
1 0 1 0 1 1 0 0   1
1 0 1 0 1 1 0 1   0
1 0 1 0 1 1 1 0   1
1 0 1 0 1 1 1 1   1
1 0 1 1 0 0 0 0   1
1 0 1 1 0 0 0 1   1
1 0 1 1 0 0 1 0   1
1 0 1 1 0 0 1 1   1
1 0 1 1 0 1 0 0   1
1 0 1 1 0 1 0 1   1
1 0 1 1 0 1 1 0   1
1 0 1 1 0 1 1 1   1
1 0 1 1 1 0 0 0   1
1 0 1 1 1 0 0 1   1
1 0 1 1 1 0 1 0   1
1 0 1 1 1 0 1 1   1
1 0 1 1 1 1 0 0   1
1 0 1 1 1 1 0 1   1
1 0 1 1 1 1 1 0   1
1 0 1 1 1 1 1 1   1
1 1 0 0 0 0 0 0   1
1 1 0 0 0 0 0 1   1
1 1 0 0 0 0 1 0   1
1 1 0 0 0 0 1 1   1
1 1 0 0 0 1 0 0   1
1 1 0 0 0 1 0 1   1
1 1 0 0 0 1 1 0   1
1 1 0 0 0 1 1 1   1
1 1 0 0 1 0 0 0   1
1 1 0 0 1 0 0 1   1
1 1 0 0 1 0 1 0   1
1 1 0 0 1 0 1 1   1
1 1 0 0 1 1 0 0   1
1 1 0 0 1 1 0 1   0
1 1 0 0 1 1 1 0   1
1 1 0 0 1 1 1 1   1
1 1 0 1 0 0 0 0   1
1 1 0 1 0 0 0 1   1
1 1 0 1 0 0 1 0   1
1 1 0 1 0 0 1 1   1
1 1 0 1 0 1 0 0   1
1 1 0 1 0 1 0 1   1
1 1 0 1 0 1 1 0   1
1 1 0 1 0 1 1 1   1
1 1 0 1 1 0 0 0   1
1 1 0 1 1 0 0 1   1
1 1 0 1 1 0 1 0   1
1 1 0 1 1 0 1 1   1
1 1 0 1 1 1 0 0   1
1 1 0 1 1 1 0 1   1
1 1 0 1 1 1 1 0   1
1 1 0 1 1 1 1 1   1
1 1 1 0 0 0 0 0   1
1 1 1 0 0 0 0 1   1
1 1 1 0 0 0 1 0   1
1 1 1 0 0 0 1 1   1
1 1 1 0 0 1 0 0   1
1 1 1 0 0 1 0 1   1
1 1 1 0 0 1 1 0   1
1 1 1 0 0 1 1 1   1
1 1 1 0 1 0 0 0   1
1 1 1 0 1 0 0 1   1
1 1 1 0 1 0 1 0   1
1 1 1 0 1 0 1 1   1
1 1 1 0 1 1 0 0   1
1 1 1 0 1 1 0 1   0
1 1 1 0 1 1 1 0   1
1 1 1 0 1 1 1 1   1
1 1 1 1 0 0 0 0   0
1 1 1 1 0 0 0 1   1
1 1 1 1 0 0 1 0   1
1 1 1 1 0 0 1 1   1
1 1 1 1 0 1 0 0   0
1 1 1 1 0 1 0 1   1
1 1 1 1 0 1 1 0   1
1 1 1 1 0 1 1 1   1
1 1 1 1 1 0 0 0   0
1 1 1 1 1 0 0 1   1
1 1 1 1 1 0 1 0   1
1 1 1 1 1 0 1 1   1
1 1 1 1 1 1 0 0   0
1 1 1 1 1 1 0 1   1
1 1 1 1 1 1 1 0   1
1 1 1 1 1 1 1 1   1

Output O2 (DATAOUT_EN)

Truth table

I1 I2 I3 I4 I9 I10   O2
0 0 0 0 0 0   1
0 0 0 0 0 1   1
0 0 0 0 1 0   1
0 0 0 0 1 1   1
0 0 0 1 0 0   1
0 0 0 1 0 1   1
0 0 0 1 1 0   1
0 0 0 1 1 1   1
0 0 1 0 0 0   1
0 0 1 0 0 1   1
0 0 1 0 1 0   1
0 0 1 0 1 1   1
0 0 1 1 0 0   1
0 0 1 1 0 1   1
0 0 1 1 1 0   1
0 0 1 1 1 1   1
0 1 0 0 0 0   1
0 1 0 0 0 1   1
0 1 0 0 1 0   1
0 1 0 0 1 1   1
0 1 0 1 0 0   1
0 1 0 1 0 1   1
0 1 0 1 1 0   1
0 1 0 1 1 1   1
0 1 1 0 0 0   1
0 1 1 0 0 1   1
0 1 1 0 1 0   1
0 1 1 0 1 1   1
0 1 1 1 0 0   0
0 1 1 1 0 1   1
0 1 1 1 1 0   1
0 1 1 1 1 1   1
1 0 0 0 0 0   1
1 0 0 0 0 1   1
1 0 0 0 1 0   1
1 0 0 0 1 1   1
1 0 0 1 0 0   1
1 0 0 1 0 1   1
1 0 0 1 1 0   1
1 0 0 1 1 1   1
1 0 1 0 0 0   1
1 0 1 0 0 1   1
1 0 1 0 1 0   1
1 0 1 0 1 1   1
1 0 1 1 0 0   1
1 0 1 1 0 1   1
1 0 1 1 1 0   1
1 0 1 1 1 1   1
1 1 0 0 0 0   1
1 1 0 0 0 1   1
1 1 0 0 1 0   1
1 1 0 0 1 1   1
1 1 0 1 0 0   1
1 1 0 1 0 1   1
1 1 0 1 1 0   1
1 1 0 1 1 1   1
1 1 1 0 0 0   1
1 1 1 0 0 1   1
1 1 1 0 1 0   1
1 1 1 0 1 1   1
1 1 1 1 0 0   1
1 1 1 1 0 1   1
1 1 1 1 1 0   1
1 1 1 1 1 1   1

Output O3 (DMA_RW)

Truth table

I1 I2 I3 I4 I10   O3
0 0 0 0 0   1
0 0 0 0 1   1
0 0 0 1 0   1
0 0 0 1 1   1
0 0 1 0 0   1
0 0 1 0 1   1
0 0 1 1 0   1
0 0 1 1 1   1
0 1 0 0 0   1
0 1 0 0 1   1
0 1 0 1 0   1
0 1 0 1 1   1
0 1 1 0 0   1
0 1 1 0 1   1
0 1 1 1 0   0
0 1 1 1 1   1
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   1
1 1 1 0 0   1
1 1 1 0 1   1
1 1 1 1 0   1
1 1 1 1 1   1

Output O4 (CONFIG_RD)

Truth table

I1 I4 I7 I8   O4
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   0
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   1
1 1 1 1   1

Output O5 (CTRL_REG_WR)

Truth table

I1 I4 I5 I7 I8   O5
0 0 0 0 0   1
0 0 0 0 1   1
0 0 0 1 0   1
0 0 0 1 1   1
0 0 1 0 0   1
0 0 1 0 1   1
0 0 1 1 0   1
0 0 1 1 1   0
0 1 0 0 0   1
0 1 0 0 1   1
0 1 0 1 0   1
0 1 0 1 1   1
0 1 1 0 0   1
0 1 1 0 1   1
0 1 1 1 0   1
0 1 1 1 1   1
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   1
1 1 1 0 0   1
1 1 1 0 1   1
1 1 1 1 0   1
1 1 1 1 1   1

Output O6 (ROM1_SEL)

Truth table

I1 I4 I7 I8 I9   O6
0 0 0 0 0   1
0 0 0 0 1   1
0 0 0 1 0   0
0 0 0 1 1   1
0 0 1 0 0   1
0 0 1 0 1   1
0 0 1 1 0   1
0 0 1 1 1   1
0 1 0 0 0   1
0 1 0 0 1   1
0 1 0 1 0   1
0 1 0 1 1   1
0 1 1 0 0   1
0 1 1 0 1   1
0 1 1 1 0   1
0 1 1 1 1   1
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   1
1 1 1 0 0   1
1 1 1 0 1   1
1 1 1 1 0   1
1 1 1 1 1   1

Output O7 (ROM2_SEL)

Truth table

I1 I4 I7 I8 I9   O7
0 0 0 0 0   1
0 0 0 0 1   1
0 0 0 1 0   1
0 0 0 1 1   1
0 0 1 0 0   0
0 0 1 0 1   1
0 0 1 1 0   1
0 0 1 1 1   1
0 1 0 0 0   1
0 1 0 0 1   1
0 1 0 1 0   1
0 1 0 1 1   1
0 1 1 0 0   1
0 1 1 0 1   1
0 1 1 1 0   1
0 1 1 1 1   1
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   1
1 1 1 0 0   1
1 1 1 0 1   1
1 1 1 1 0   1
1 1 1 1 1   1

Output O8 (RELEASE_BUS)

Truth table

I1 I4 I7 I8 I9   O8
0 0 0 0 0   0
0 0 0 0 1   1
0 0 0 1 0   1
0 0 0 1 1   1
0 0 1 0 0   1
0 0 1 0 1   1
0 0 1 1 0   1
0 0 1 1 1   1
0 1 0 0 0   1
0 1 0 0 1   1
0 1 0 1 0   1
0 1 0 1 1   1
0 1 1 0 0   1
0 1 1 0 1   1
0 1 1 1 0   1
0 1 1 1 1   1
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   1
1 1 1 0 0   1
1 1 1 0 1   1
1 1 1 1 0   1
1 1 1 1 1   1