Posted By
siz
on 2017-10-31
14:58:00
|  Re: Commodore 16 and 'Device Not present' error :-(
If your drives work with the C64 that means that you really have a hardware problem. First thing to try is to replace the 7501/8501 CPU as that's the one that controls the serial bus. In most cases that's the culprit.
About the TCBM (1551) preference over serial: it's done by software in the KERNAL: if you try to access device #8 or #9 it first checks if a 1551 drive is present with that number. If that's not detected it will send the usual device number talk/listen commands to the serial bus.
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