I notice an old post which mentions it is possible to replace the MMU with a 16V8 GAL:
I have a couple of LATTICE GAL16V8D15LP chips handy. Would these do the job when programmed with the TL866A?
Also, is it just a case of swapping out the MMU and directly plugging in the GAL?
I ask because, doing the same with the EMMU seems to be possible as well:
However in that case it appears rather more convoluted, requiring the population of an empty header with a 74LS95/74F95 as well as shorting leg 15 of the GAL to ground.
For the sake of reference, this is the JEDEC proposed for the MMU:
mmupal.jed 3.12KB 13 downloads
and this for the EMMU:
co25953-gal.jed 2.91KB 11 downloads
Edited by morelenmir, Thu Aug 9, 2018 3:24 PM.