Quote:
Originally Posted by cmorley
By "memory buffers" do you mean the resistor packs on an A501?
Attachment 58772
They are required to reduce voltage undershoot (& overshoot) at the RAM chips (worse on early Amigas rev3 & rev5). Undershoot & overshoot can affect reliability and if too great will damage the RAM (which is why they are fitted on the Commodore A501). |
Hi Cmorley,
Sorry for my late response. I'm refering to the CAS and RAS signals, also refer as Refresh "Feature" by Commodore, using a 74F27, 74F86 and a 74LS163A or 74ACT00 and 74ACT273 by Techtravels.
You can find more information by those links
http://www.amigawiki.org/dnl/schematics/A500_R6.pdf by Amigawiki.org and or
https://www.techtravels.org/a500-dram-card/ by Techtravels.
I know you made some refresh in your GAL program, my doubt is they will work like Commodore design?
regards,
1NOM155