03.024 What kind of RAMs do I need for a TWGS or ZipGS speedup?
Description
This article is from the Apple II Csa2 FAQ, by Jeff Hurlburt with numerous contributions by others.
03.024 What kind of RAMs do I need for a TWGS or ZipGS speedup?
If you upgrade your accelerator RAM, go for fast 32k x 8 Static RAM in a
28-pin Dip package. If your RAM sockets are "skinny" (about as fat as a typical
74xx TTL IC), you want a 300-mil wide package. Otherwise, you will need a 600-
mil wide IC or a socket adaptor for 300-mil (or do the socket mods described
earlier in this FAQ).
Fast 600-mil package 32k x 8 SRAMs are fairly rare. However, the IDT71256
is supposed to be available at good speeds (25ns-40ns) in a 600-mil version
from Integrated Device Technology.
The selection of 300-mil 32k x 8 SRAMs is much larger: Cypress's CY7C199,
Hitachi's HM62256, ... .
By: Sandy
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