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programable logic array (PLA)

this is just computer what has:
4 inputs (abcd)
8 outputs (01234567)

it has button on side, what open programable compartment

in it has:
"and" & "or" sides


"and" has input-names in up

W'a' D'a' W'b' D'b' W'c' D'c' W'd' D'd'
W - white color
D - dark color

dark color active if input FALSE
white color active if input TRUE

if all colors active, group is activating

group 1|W'a':1, D'a':0, W'b':0, D'b':1, W'c':1, D'c':0, W'd':1, D'd':0|
short: 1[10011010]

group active if:
inputs "a", "c", "d" is active
input "b" isn't active


"or" side depends on groups

"or" has 8 outputs

if group work it return all outputs what written in side

1[10010101][10000000] (and & or)

group 1 send signal to 0 output if:
input "a" is active
inputs "b", "c", "d" isn't active

1[10010101][10000000]
2[01100101][01000000]

group 1 send signal to 0 output if:
input "a" is active
inputs "b", "c", "d" isn't active

group 2 send signal to 1 output if:
input "b" is active
inputs "a", "c", "d" isn't active

for image header i use pixartprog[github.com]
wikipedia page about PLA[en.wikipedia.org]

on header written bcd to 7-segment decoder