TTL ... and a few gals... I trust hardware more than
software is my view
point.
Real cache memory 32k*8 is about 15ns access time in a skinny 28 pin
package.
I am just not sure how much memory you can get on a card however ... Sigh.
You have many ways to go. Old Pentium cache is 128K X 4 in a very small
SMD package. But you can get 32X8 in DIP packages which will be free for
asking anywhere. A 4-layer board is way more expensive with PTH. But in
Brazil you can have these boards made for cheap, many american friends use
to make boards on cirvale and tec-ci.