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Re: I have a 15MHz IIgs!
On 11/02/2012 06:00 PM, STYNX wrote:
Ok the thigs i have learned so far regarding the ZIP GSX: try to replace
the 74F0X with 74S0X parts. The Schottky part has a higher output per gate
and is a little faster (4ns vs 3ns). 74AC0X will work as well, as will a
mix of AC and S. I used a 74AC00 and a 74S02. 74AS0X will work, but are not
as compatible as AC or S, even though they should be faster (1.5ns)
I'll order some 74S and 74AC parts - none in the parts bins here
The cache is a real bitch! I had many problems with the CY... kind of sram
(cypress). Toshiba, Fairchild , Emtron and UMC (not the type that has a
handwrite-font "me" in the model number) worked the best for me. I used 4
same type, same speed (15ns) srams in the ZIP.
Very interesting. When I hotrodded my ZIP GSX I installed Cypress CY7C199
12nsec. 32kx8 parts for tag ram (changed sockets out for .3" width). After
reading your comment, I swapped in a couple of UMC UM61256K-15s. So far, so
good. These have a script "m" in the model number - is that possibly what you
meant by "me" - or are some of these actually labeled with "me" (two letters)?
If the UMC parts don't work out, I also have:
Alliance AS7C-256-20PC
Winbond W2465AK-15
Fairchild 71256SA20-TP
Have you used any of those parts?
Steve