After having faced for the first time the µPD765a I think I have now a nice little tool for using with your 3" or 3.5" drives.
The tool lets you turn the motor on and off, seek a specific track, try to find a specific SectorID, calibrate and measure (I think quite reliably) the rotational speed of the motor.
I didn't know it wasn't so hard programming for the FDC controller. Total time for the tool has been around 8 hours. Almost more time setting up the text in the correct places in the screen and testing than any other thing :) Regarding the reliability of the measured RPMs in Winape it always gives me 300 RPMs. I tried with some drives here and it works like a charm. Of course there could be a little deviation but I think this is really useful at least diagnosing non-working drives as it happened to me with the latest two ones I bought. One of them is already repaired. The final solution I used for measuring the RPMs was to look for an invalid SectorID or a track without address marks. Both performs fine. I also want to warns to anybody that would like to use it. If it breaks your drive I am not responsible. So you have been warned. For me it has been really helpful.
Any suggestion in order improving it would be more than welcome! 
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CPCrulez[Content Management System] v8.7-desktop/c
Page créée en 492 millisecondes et consultée 2551 foisL'Amstrad CPC est une machine 8 bits à base d'un Z80 à 4MHz. Le premier de la gamme fut le CPC 464 en 1984, équipé d'un lecteur de cassettes intégré il se plaçait en concurrent du Commodore C64 beaucoup plus compliqué à utiliser et plus cher. Ce fut un réel succès et sorti cette même années le CPC 664 équipé d'un lecteur de disquettes trois pouces intégré. Sa vie fut de courte durée puisqu'en 1985 il fut remplacé par le CPC 6128 qui était plus compact, plus soigné et surtout qui avait 128Ko de RAM au lieu de 64Ko. |
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