Re: C128 256K MMU expansion

From: Michal Pleban <*lists_at_michau.name*> Date: Mon, 25 Jul 2022 19:22:39 +0200 Message-ID: <c1246e45-256b-5f02-3cac-12a7c973ea2f_at_michau.name> · lists_at_michau.name

Jim Brain wrote on 25.07.2022 05:18:

>>> 72 macrocells would be too few for the MMU, but a 95288 should work, or a small Lattice FPGA.
>> A quick check w/o pushing anything shows 160 as the smallest that could accomodate this design. Unsure if it could be squeezed into 128
> 
> Yep, I counted the registers needed and was above 144, so 288 is the 

How about _two_ CPLDs which sit next to each other on the PCB, and use 
their remaining I/O pins to communicate with each other? If you can 
break the design down into such two pieces, you can use two 
128-macrocell CPLDs.

Regards,
Michau