Gigatron schematics error?

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maca134
Posts: 1
Joined: 22 Jul 2019, 15:30

Gigatron schematics error?

Post by maca134 » 22 Jul 2019, 15:41

Hey, first post, so id like to say hello!

Been mess around recently with DIY cpu's etc and came across the Gigatron and decided to give it a shot building it in Logisim.

After look the schematics here: https://cdn.hackaday.io/files/207818890 ... matics.pdf, I started on making the ALU (as the multiplex approach is pretty interesting).

It looks like the pins on the top 4 bits (U17-U20) look like they may be abit backwards. After building the thing in logisim, things did not make sense with the top 4 bits (bottom 4 bits worked fine).

https://dl.dropboxusercontent.com/s/qvv ... b7a928.png

I could be completely wrong, im a programmer and not an electronic pro.

Moved from "Kit assembly" by moderator.

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marcelk
Posts: 348
Joined: 13 May 2018, 08:26

Re: Gigatron schematics error?

Post by marcelk » 26 Jul 2019, 21:17

It makes sense on the PCB. I wouldn't follow the same layout in Logisim :-)

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