Replacing the 130XE MMU amd EMMU with GAL chips

[Replacing the 130XE MMU amd EMMU with GAL chips]

5 hours ago, blacka013 said:

Great work Barty.

 

Any chance of a photo showing the IC with out the black tape on please?

 

Regards

There you go!

[Replacing the 130XE MMU amd EMMU with GAL chips]

Hello everyone! In case someone is still looking for C25953 replacement in GAL please check my latest work: https://github.com/mikulski-lab/C25953-emmu/

It fully replicates C25953 so no external latch (74LS95) is required. The drawback is that is not fully 1:1 pin compatible, however if you go with GAL22v10 only a few wire bridges are required on top of the IC so it can be directly inserted into the IC socket on a motherboard.