Re: ZIPGS

[andrew.webber2@btinternet.com (Andrew Webber)]

Wayne Stewart <waynes@intergate.ca> wrote in message news:<3CE87AFE.C203E860@intergate.ca>...
> Andrew Webber wrote:
> > 
> > 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?).
> 
> Yes 7mhz, I think that was the fastest available then. 
> 
> > + 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?
> 
> Yes, it is.
> The manual (such as it is) might help, you can download a pdf of it 
> from my website at
> http://homepage.mac.com/waynes

Cheers I will check that out.
> 
> > 
> > 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.
> 
> The only difference between the 8k and 16k is that they installed 2 more
> SRAM and flipped a switch
> Pretty hard to troubleshoot without being able to try different parts.
> You could try switching it down to 8k cache and see if it improves or 
> gets worse. To do that on the first switch block turn switch 8 to the 
> on position. With the power off of course. Another possibility is that 
> 7mhz processor, it's pretty much maxed out at 8mhz.  If you can score 
> a faster 65816 it surely wouldn't hurt.
>  
> > 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?
> 
> Since the oscillator is soldered in on yours, then without soldering the 
> only upgrade is to go for more cache. Going from 16 to 64k would give 
> you about a 10% speed bump. If you were going to try for higher speeds 
> narrow static RAM would be the way to go but since you're not the wide 
> Static RAM will work. 70ns is common in the wide package and every 
> manufacturer uses slightly different numbers. I'll give you a Hyundai
> number HY62256A  LP-70.>

So could I use the same Hyundai chips for TAG and DATA?

Last night I got hold of the Hypercard stack on upgrading the Card, it
suggested that all I have to do is cut the onboard oscillator and then
place then new Oscillator in the empty socket. The board still seems
to have the old socket.

> I don't recall whether the FAQ mentions it but the plug that goes into 
> the processor socket is a bit delicate. If you need to remove the card 
> unplug the cable from the card, not from the motherboard.
Yea I thought that, but its very hard to disc. I have already bent the
pins on the card once (no major damage and cable still plugs in)
trying to do that :-(

> Wayne