Posted By
siz
on 2014-03-18
02:09:45
|  Re: 1551 Drive
Ø2 is originally generated by the 1551 FPLA but it is also available from the computer on the expansion port. BSz used the expansion port one.
DAV comes from the drive (from a jumper) it controls the device number selection (8 or 9). 1551 maps to different memory addresses from the computer's side depending on the device number so this signal is required to decode the proper location.
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