Posted By
SVS
on 2020-12-31
12:18:34
 |  Re: 1551 > monitor by directory command
I suppose that (unfortunately) it could be the paddle...
It is a critical component of the 1551. Years ago, when I've bought 2 1551s from Germany, one of them was not running. After tested all, it was the paddle. The seller sent me a spare paddle and all went OK.
After so many years I don't remember what was the behavior of the 1551 with the fault paddle, but maybe it replied with unpredictable data on the port and the system exits with that message.
siz is right when says that the ROM does not allow to halt at this address, the first $00 that could Break the CPU is not near from that address.
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