Re: ZIPGS

["Charlie" <charlied@NOSPAMbboard.com>]

"Andrew Webber" <andrew.webber2@btinternet.com> wrote in message
6b297ed0.0205191041.2247cc39@posting.google.com">news:6b297ed0.0205191041.2247cc39@posting.google.com...
> I finally got hold of an accelerator for my IIGS, but I recieved it
> with no instructions. I have looked on the FAQ and got all the dip
> settings sorted. I am unsure which model ZIP card I have. Its a ZIP GS
> 1.01 with the following chips:-
>
> + Oscillator - 32Mhz. 2 pin type. Based on the FAQ this should be a
> 8MHz Zip
> + Largest Chip - 9043 WD4701
> + WDC W65C816PL-7 (7Mhz?).
> + 4 Cache banks. TAG 1 = UM62640-70L, DATA 1 = 6264BL-10, TAG 2
> =6264-70L, DATA 2 = 6264BL-10. Cache size? The system says 16K in the
> CDA.
>
> Is this a 8Mhz/16K Cache model?
>
> The problem is that the system hangs every now and then. I thought it
> might be because its actually a 7Mhz/8k card not an 8Mhz/16K card? The
> system will work for a relatively long period then it will just stop.
> This has happened in GS/OS and in a game. I am able to soft reset the
> machine and all is ok, I don't have to power off, so I don't think its
> heat related.

There is a remote possibility that the system hanging problem is being
caused by a known bug in the ZipGS CDA.  Under certain conditions the CDA
writes a zero into the wrong memory location, possibly into another program.
I believe there is more information and a fix in the CSA2 FAQs.

Charlie


> Also what is the easiest upgrade I can do to this card without
> involving any major work (I would not trust myself with a soldering
> iron!). If its chip replacement does anyone now a good source for the
> right type of cache/processor chips?
>
> Thanks for all your help in advance! :-)
>
> Andrew