On 10/05/2010 08:19 AM, KP wrote:
All the "Softcard-derived" Z80 cards used a syncopated 3.5MHz clock, which was regarded even at the time as a major hack. Like some other cards, it has tight bus timing margins, and so running it on a system other than one it was tested in during design is actually running a reliability test. ;-)So is the final verdict on this that the card should work on a //e but it's no surprise if it doesn't work on a IIgs ROM 01 (even at 1 mHz)? Or should I be concerned that the card is defective?
It's not a surprise that it won't work reliably on a IIgs. Some of them won't even work reliably on a IIe - or, as I implied earlier, might only work on _some_ IIes.