Subject: Re: Apple IIGS ZipChip Path: lobby01.news.aol.com!newstf02.news.aol.com!portc02.blue.aol.com!bignews.mediaways.net!news-han1.dfn.de!news-ham1.dfn.de!news-ber1.dfn.de!news-lei1.dfn.de!news-nue1.dfn.de!uni-erlangen.de!newsfeed.nacamar.de!newsfeed.ecrc.net!cpk-news-hub1.bbnplanet.com!news.bbnplanet.com!news-peer.sprintlink.net!news-pull.sprintlink.net!news-in-east.sprintlink.net!news.sprintlink.net!Sprint!151.164.1.34!swbell!not-for-mail From: Rubywand Newsgroups: comp.sys.apple2 Date: Tue, 04 Nov 1997 03:53:42 -0600 Organization: Southwestern Bell Internet Services, Richardson, TX Lines: 62 Message-ID: <345EF0A6.11F1@swbell.net> References: <345E9949.4C1B@pacbell.net> Reply-To: rubywand@swbell.net NNTP-Posting-Host: ppp-207-193-8-53.hstntx.swbell.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Trace: nnrp3.rcsntx.swbell.net 878637174 20651 (None) 207.193.8.53 X-Complaints-To: usenet@nnrp3.rcsntx.swbell.net X-Mailer: Mozilla 3.01C-SBXA (Win95; I) Ron McGowan writes ... > > Help! > > I have a IIGS with a stock zip chip that, until recently, > would pass the GS self test, but now fails with > SYSTEM BAD 05012A00 .... > The DIP switches on at least some versions of the ZipGS are not especially reliable. On one board, I finally just popped off the switch assemply cover and removed the switch pieces to guarantee that the switches that should be open really were. Solder connects were used to close switches. If SW-4 is not closing, the ZipGS will not pass the Self-Test. On the other hand, your ZipGS will run a bit slower; which is probably why the default setting is OFF. You can use an Ohm meter (set to the x 1000 range to limit current) to check the switches on your board by measuring across each mini-switch while you open and close it. Another possible problem is Zip Init. Some users install it on their hard disks because it is available to be installed and forget that it's there. Zip Init's settings will automatically over-ride your on-board settings when your system is booted. It is intended for installation on bootable diskettes for changing settings to match the booted software (e.g. to keep it from running too fast). Some users believe that settings made to the Zip CDA panel (or to the CDEV panel) get saved to BatRAM. They don't. When you turn OFF the power they disappear. Also, the checked, "default", settings are not, necessarily, the 'official' factory defaults. They are just the current switch settings on the board. If you are having problems with a stock ZipGS board, some things to check are ... 1. that the board's connector tabs are making contact with the Slot sprongers. This happens pretty close to the bottom of the card; so, be sure the bottom 1/8 inch is clean. 2. that the ribbon cable from the board to the uP socket does not have any breaks. 3. that the ZipGS plus other cards are not pulling more current than your power setup can handle without producing noise glitches (i.e. fatten the leads on your power supply and consider adding power jumpers to the bottom of the motherboard). > if I put in the stock 65c816 all is good > the switch 4 setting on bank 1 of the Zip has no effect on this > Where are you plugging in the stock 65C816? Rubywand