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 adapter 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, … .
