From: Supertimer Subject: Re: self-test GS /scsi Date: Saturday, July 03, 1999 3:53 PM cornelio@san.rr.com (Louis Cornelio) wrote: >not a transwarp, so.. Zip GS? >tried both enabled and disabled........ Just another thought......the earliest version of the Zip GS had DMA compatibility problems. Thus, flip Switch 1 of the HS SCSI card's DIP switches to the OPEN (up) position and see if this fixes things. As for the Zip GS, you might want to consider enhancing it. WDC sells a 14Mhz 65C816 PLCC chip (the design actually takes it into the 20Mhz range, but WDC only tests the chips to 14Mhz). As an educator, you are eligible to buy the chip from them for $20. All you need is the chip and an oscillator to make it go faster. The oscillator should be rated 4x the Mhz that you want your Zip to go. People have had good results to 12.5Mhz (like my TWGS), but some cards can go beyond that into the 15Mhz and 16Mhz range. It just depends. My recommendation is to try for 10Mhz with a 40Mhz oscillator and a new chip from WDC first. This will always work. Then try for 12.5Mhz. Then beyond. The oscillators are only a few cents each and for all these speeds, the CPU is the same 14Mhz model.