[Coco] CoCo SDC weirdness; i.e. finding the FDC slot

Robert Gault robert.gault at att.net
Sat Mar 4 09:19:08 EST 2017


It would be easy enough to bypass the problem of which slot contains the FDC. All one needs to do 
for OS-9 is modify the rb1773.asm so that it does what clock2_smart.asm in the init routine. This 
clock2 module assumes the watch is in slot4, tries access it and if not found alters the slot# and 
tries again.
So, in rb1773 at Boisy's test for the presence of an FDC, change "lbne NoHW" to a test of the $FF7F 
slot value, change it and retest until all slots checked. Then branch to NoHW.

Now it will be slightly more complicated with Disk Basic. It seems to me that the CoCo SDC software 
should look for the FDC and swap slots as needed.

Robert



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