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Data and Return Stack address decoders

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-starrAndrew Starr • 01/17/2016 at 05:22•5 Comments

The stack decoders are now complete and mounted in the frame:

The yellow lights are indicators for the row and column output drivers.
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Core Blimey

12/08/2015 at 06:45 • 8 comments
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Core Memory Plane PCBs

01/20/2016 at 08:35 • 3 comments

Discussions

Dave Gönner wrote 01/17/2016 at 09:55 • point

Wow Andrew, that looks fantastic! Those are some pretty large boards on the back, must be quite an investment. 

Looking at the frame, this thing is going to be huge! Can't wait to see the rest. 

  Are you sure? yes | no

Andrew Starr wrote 01/20/2016 at 08:25 • point

Thanks Dave. Cost isn't too enormous, since the prices out of Chinese board houses are pretty reasonable. But yes, it is going to be big, and this is basically a toy computer. You can see why mainframes used to fill rooms (and even buildings)!

  Are you sure? yes | no

Yann Guidon / YGDES wrote 01/17/2016 at 05:36 • point

Fantastic !!!

  Are you sure? yes | no

Andrew Starr wrote 01/17/2016 at 08:12 • point

Thanks Yann. Next up: the core memory arrays. I have PCBs due in any day now.

  Are you sure? yes | no

Yann Guidon / YGDES wrote 01/17/2016 at 08:15 • point

great news ! :-)

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