Re: Problem PCT With ZipGS

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

Bryan Parkoff <BParkoff@satx.rr.com> wrote:

>     PC Transporter works fine with TransWarp GS on Apple IIgs motherboard
> ROM 01.  If I install ZipGS instead of TransWarp GS while running PC
> Transporter, it causes the screen to scroll up/down and scramble.

This is the PC Transporter's video output which is misbehaving?

Which method are you using to get video out of the PC Transporter?
(Composite, CGA digital video, or Analog RGB via the ColorSwitch card)

What are the specifications of your ZipGS (CPU speed, cache
configuration)?

> I tried two different ZipGS cards, but it remains the same.  I did disable
> cache and speed to slow (not accelerate).  It does not resolve the
> problems.

I don't know what is happening here, but it isn't a general
incompatibility - my IIgs (ROM 3) has both a ZipGS and PC Transporter,
and a friend also had the same combination, and neither of us ever saw a
problem like the one you describe.

I forget whether I got my PC Transporter while I was still using a ROM 1
IIgs (which also had a ZipGS), but it is quite likely.

>     Do you have idea what is wrong with ZipGS?  I did diagnostic that it
> shows Bad System.

If the ZipGS is enabled, certain system tests will always fail (the
timing is wrong).  Disabling the Zip (with the appropriate DIP switch)
should allow the tests to pass.

-- 
David Empson
dempson@actrix.gen.nz