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Board NEDONAND-8

A project log for NEDONAND homebrew computer

NEDONAND is 8-bit homebrew computer entirely built out of many 74F00 chips (2-input NAND gates)

SHAOSSHAOS 02/28/2016 at 13:050 Comments

NEDONAND-8 is one multiplexer 8:1 controlled by 3 address inputs - see "mux8" in nedonand.circ:

Eagle v5.12 circuit replicates the same approach:

And it's already ordered through OSHPark (but not yet shared there because I need to test it first):

Pins description:

1) GND - ground
2) I0 - input if A=0
3) I1 - input if A=1
4) I2 - input if A=2
5) I3 - input if A=3
6) I4 - input if A=4
7) I5 - input if A=5
8) I6 - input if A=6
9) I7 - input if A=7
10)OUT - output of multiplexer
11)NC - not connected
12)VCC - power +5V
13)GND - another ground
14)A0 - bit 0 of address
15)A1 - bit 1 of address
16)A2 - bit 2 of address

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