That doesn't make any sense to me. I would expect that cables can be much longer (around 150 cm). It rather sounds like the external disk drive would include some sort of termination as otherwise signals can get reflected at the end of the cable and confuse the floppy controller. > On Feb 5, 2016, at 9:34 PM, Michał Pleban <lists@michau.name> wrote: > > Eh. Of course I meant all the lengths to be in cm, not mm. So the good > length is 30 cm. > > > Michał Pleban wrote: >> Hello! >> >> A quick update: Today I tried various resistor values between GND and >> RDATA to no avail. So I decided the best solution for me would be a >> shorter cable. I got a pair of scissors and began to cut the cable into >> and shorter parts, while one of its end was still plugged into the C65. >> I wrote a simple BASIC program which tries to download the disk >> directory 100 times and gives the percentage of successful operations. >> >> Here is the success rate as a function of cable length: >> >> 100 mm - 15% >> 60 mm - 70% >> 50 mm - 90% >> 40 mm - 95% >> 30 mm - 100% >> >> Not bad - with a 30 mm cable I can read the directory reliably. SO to >> test things further, I created a 64 kB SQL file, then used the DOS COPY >> command to duplicate it, and finally used TYPE to display it on the >> screen. All the operations were performed without errors. >> >> So I conclude that a 30 mm cable does not cause any problems with disk >> operations. Perhaps it would be best to make it 25 mm just in case - the >> signals will also need to go a bit over the PCB and the flat ribbon >> cable before they reach the drive. >> >> The big question is now: where can I get a 25 mm mini-DIN8 cable? :-) >> >> Regards, >> Michau. >> >> Message was sent through the cbm-hackers mailing list > > > Message was sent through the cbm-hackers mailing list Message was sent through the cbm-hackers mailing listReceived on 2016-02-05 22:00:11
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