On Sat, Oct 6, 2018 at 7:45 PM Gerrit Heitsch <gerrit@laosinh.s.bawue.de> wrote: > > > Well, this version is using an early version of the Zorro bus, the whole > logic implemented in PALs and TTLs and not a BUSTER chip as in the later > A2000 where AGNUS came in 84pin PLCC instead of 48pin DIP. There are > some problems with the bus protocol on the Zorro slots. > > The main difference is that if you use a CPU card with this A2000, you > have to remove the 68000 from the mainboard. > > But then, I am not using a CPU card or any kind of expansion card in it > and I either have to use the right CPU (the ST 68000) when using KS 1.3 > or just use KS 1.2 with any 68000 to have no problems at all. I don't know what type of chip "hosts" the Kickstart (I'm not so expert on Amigas), but did you try to copy the KS 1.3 on different EPROMs? Sounds like some weird decoupling/logic-threshold/rail-bouncing problem. I would have a good look at the CPU bus with a logic analyzer. FrankReceived on 2018-10-06 20:02:10
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