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Softcard Flakyness



I'm currently having trouble with a Softcard, a 1:1 clone of the Microsoft design, it seems.

The card works well in a IIe, but fails to work in a II+. The symptom is random crashes during or shortly after I boot CP/M 2.23. The card doesn't seem to disturb normal 6502 operation though.

I tried pulling all cards except for the Sofcared and one Disk II controller. No improvement.

Unfortunately I don't own a second II+ and/or a second Softcard to test.

What do you think? Is this likely to be some problem on the II+ mainboard, or is the card likely to be at fault?

Thanks for any tips.
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Linards Ticmanis