Zip's 12.4mhz limit & 7400

[fmlin@netcom.com (Frank M. Lin)]

Since I'm whipping up the mini-FAQ for TWGS/Zip upgrade, I would like
to get more information about Zip's limitaion.

Where is the location of this 7400 chip?  What is its function?  Looking
at the Digi-Key catalog, there are tons of 7400 variations listed.
And within each series ( such as AC, ACQ, ACT, HCT, AHCT HCTLS ... etc. ),
there are many different kinds, like Quad 2-Input NAND Gate, Quad 2-Input
NOR Gate, ... etc.  Which one is needed for the Zip?

Also, what SRAM speed should one get for 15mhz?  15ns are just $7.95 
a piece now anyway...  I guess I'll just tell them to get these.

-- 
frank m. lin
fmlin@netcom.com