Quad 2-Input NAND Gate

A project log for ED-64: A discrete 8-bit computer

ED-64 will be an 8-bit computer built with discrete components, and will feature a ferrite core memory (documented as a separate project).

Andrew Starr • 11/23/2015 at 07:47•3 Comments

The first NAND module has passed testing:

A screencap of the schematic of one of the gates (1/4 of the module):

As you can see, it is basically my standard complementary-driven totem pole output, with a couple of schottky diodes in a wired-AND input configuration.

Almost ready to start populating the stack address decoder panels....!

Previous log

AND gate passes testing

11/05/2015 at 02:17 • 4 comments

Next log

Holy Crap, it works!

11/24/2015 at 08:07 • 1 comment

Discussions

Andrew Starr wrote 11/23/2015 at 19:39

For a stack address decoder:

6 x FF
6 x quad AND
4 x quad NAND
4 x quad OR
4 x 2-to4 decoders

OR modules are in production...

Are you sure? yes | no

Yann Guidon / YGDES wrote 11/23/2015 at 20:35

I can't wait to see them all work together !

Are you sure? yes | no

Yann Guidon / YGDES wrote 11/23/2015 at 13:33

how many of these modules will you need ? :-)

Are you sure? yes | no

Quad 2-Input NAND Gate

AND gate passes testing

Holy Crap, it works!

Discussions

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