Wirewrapping Motherboard

A project log for NEDONAND homebrew computer

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

SHAOS 04/17/2016 at 22:103 Comments

This is a motherboard to connect all parts of NEDONAND together. I decided to use "wire-wrap" technique, but because female header receptacles are relatively new and not exist in wire-wrapping form (with long terminals with square post) I used "side-kick" soldered board where I collect all header receptacles for NEDONAND boards (probably I will need another one to host everything):

On the top of a side-kick you can see sockets for registers A,B,C,D,E and T (temporary register) and some other things as multiplexers and demultiplexers. Five 7-segment indicators will show registers contents (directly without decoding) for registers A,B,C,D,E and 10-LED bar graph on the right to show content of register F plus 2 additional signals (as ALU usage flag for example). Golden header on the very top of a side-kick is an interface between wire-wrapped universe and soldered universe to make things easier...


Yann Guidon / YGDES wrote 04/17/2016 at 22:32 point

Daaamn I should get the #DYPLED ready so you don't have to deal with naked 7-segments displays. But I suppose you can buy #PICTIL before :-D

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SHAOS wrote 04/17/2016 at 22:34 point

No, it has to be bare NANDs - no microcontrollers, no even memory (at least in the beginning ; )

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Yann Guidon / YGDES wrote 04/17/2016 at 22:39 point

ooops I forgot that little detail :-D

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