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 > > 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. 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. Wayne 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 "Andrew Webber" wrote in message news:412ceeb0.0205201357.ad10c15@posting.google.com... > "Charlie" wrote in message news:... > > "Andrew Webber" wrote in message > > 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 > > I had a look in the CSA2 and could not see anything on the fixed CDA. > Do you know where to get hold of the new CDA?,FTAs version, or Zippy? > I have looked everywhere but am unable to get a usable version. I guess my memory about the information being in the CSA2 FAQs was wrong. Google groups has a lot of information from previous discussions. Try this link: http://groups.google.com/groups?hl=en&lr=&q=zipgs+cda+bug&btnG=Google+Search &meta=group%3Dcomp.sys.apple2.* One of the fixed files is called ZipDAv137shk.bin but the only link I can find is dead. The file below contains v1.3 but I'm not sure if it is the fixed CDA. http://www.apple2.org.za/gswv/A2.LOST.N.FOUND.CLASSICS/ZipGS_sdk.bin 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