Re: ZipGS cache behaviour (was Re: ZipGSx Upgrade Questions)

[dempson@actrix.gen.nz (David Empson)]

Scott Alfter <salfter@salfter.ncc74656.dyndns.org> wrote:

> Time to get a table going:
> 
> configuration      1 MHz 2.8 MHz max speed notes
> ================== ===== ======= ========= ======================
> stock IIGS           48     20      20
> with ZipGS 8/16      48     20     8/14    not cached beyond 3 MB
> with ZipGS 12.5/64   48     20      6

It might also be worth noting whether the machine is a ROM 1 or ROM 3,
though I doubt this would make much difference.  The ZipGS is probably
designed to assume a ROM 3 (as far as ROM caching is concerned), and it
doesn't need to know about motherboard vs memory expansion card RAM.

We now need people with 8 KB and 32 KB of cache to run the program and
see where the cache limit kicks in to confirm the expected 1 MB and 7 MB
limits.  Other clock speeds are of lesser interest, as this program
doesn't run long enough to get a good benchmark.

I could remove half the RAM from my Zip, but it is working fine and I
don't want to touch it.

My original ZipGS (64K cache) is unreliable, but I could try it in my
ROM 1 IIgs with the cache reduced to 32K.  (If I remember right, it
works for a couple of hours then starts crashing.)