> You can't put them all into 1 chip.You can put them
> all in 2. The board selects 1 odd and 1 even ROM at
> the same time (or nearly same). It latches the data from
> one (odd I think) for later use. It's like a 16 bit data
> bus to make up for the SLOW EPROMs of the time. Keep in
> mind that it runs at 1.66 MIPS (or higher?) so it needs
> to grab data fast.
Thanks for the feedback Paul and Steve. Lots of good data. It seems to make
the most sense to go with 2 27256s for the 4 game hack. I'll try to burn up
the EPROMs and fab the 2532->27256 adapters next week, and let people know how
it turns out.
> BTW it really is 1.66 MIPS. People go nuts when you tell
> 'em its all TTL.
This is plain amazing for a ~1974 design, BTW (if I recall, that's when the
Cray 1 came out). I can see why it is hard to find 2716s that can keep up (my
RipOff board came with 4 2516s which had been hacked to be pin compatible
with 2716s...guess that dude didn't know about the 2532 trick) Of course,
those aren't the most sophisticated MIPs in the world, but it's still pretty
damn cool...
Ray
