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Re: ZIPGS

Andrew Webber wrote:


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

If you're not trying to go too fast the 70ns SRAM will work fine in 
both TAG and DATA. In TAG they worked at 10.5mhz but not 12mhz. I 
don't happen to have an oscillator between those speeds. In TAG It 
should be fine at at least 15mhz. I haven't tried it at higher speed 
as my ZipGSs are pretty unstable over 15mhz. I'm using 15ns in both TAG 
and DATA though TAG doesn't really need that fast SRAM. Someday maybe 
I'll order in some 12ns SRAM and see if that'll make 16mhz stable.


> 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've never had to do an upgrade on a ZipGS with a 2 pin oscillator. The
couple I've looked at didn't have any socket installed. They also had 
extra parts on the circuitboard. I can't recall the exact details of 
that. If you want to compare cards there's a scan of one of my ZipGS 
on my website.

There's also a bit about upgrading the ZipGS at
http://www.apple2.org.za/gswv/A2.2000/Sept.Preview/ZIP.GS/SPQR's.ZIP.UPGRADE.html
There should be a fair bit of postings about the ZipGS if you do a
Google search 


	Wayne