I don't remember the speed (it was a long time ago) but ZoomFloppy and OpenCBM has a utility called d81copy. That can be used to copy SFD-1001 and 8250 disk images (perhaps others too) to and from image files. 2016-09-24 19:44 GMT+02:00 <Ruud@baltissen.org>: > Hallo allemaal, > > > The subject can be translated into: is there a (open source) speed > copier available for the IEEE drives, like there is Starcommander > available for the IEC drives? > > If the above answer cannot be answered, please proceed reading. > > So far I created by simply reading the sectors one by one by using > the BLOCK-READ command. My PC issued the command, not a CBM! The > received bytes were written directly into the image. > But it takes about 20 minutes to copy one floppy. If that sounds > bad, that is equivalent to 75 seconds for a 1541 floppy. Rather good > for standard command, IMHO. But if there can be any speed gained, it > should be on the drive side. But how? > > First: my target is the 8250 drive only. > Reasons: > - It can read both 8050 and 8250 floppies. > - I can create images of 4040 floppies using a 1541 and Star > Commander > > If the 8250 had only one CPU, like the 1541, things would be simple: > read a byte from the floppy and output it on the bus (using a faster > protocol). GCR is already taken care of by the hardware so one > problem less. In fact I would just take SC and alter the source "a > bit". > > But it has two CPUs so that won't work. If you got here, the above > question about the speed copier couldn't be answered. But that > doesn't mean that other information or software on this subject is > available and before inventing the wheel twice, I would welcome > anything. > > Thank you in advance! > > > My idea so far: The FDC CPU keeps reading sectors in a row into some > reserved buffers. Once a buffer is full, the IEEE CPU sends the data > to the PC. IMHO three or four buffers are enough. Plus some bytes to > inform the IEEE CPU what sector has been loaded into a specific > buffer. After the FDC CPU has read all sectors of a track, the next > track is read. > > > -- > > Kind regards / Met vriendelijke groet, Ruud Baltissen > www.Baltissen.org > > > > > > > > Message was sent through the cbm-hackers mailing list > Message was sent through the cbm-hackers mailing listReceived on 2016-09-24 19:00:02
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