Hello Rob, Sunday, December 2, 2012, 10:12:00 AM, you wrote: >>> Well, I cranked the speed down to around -6ms to slow (I assume that's >>> milliseconds per revolution) and it appears to format more - it got to >>> around track 20 before barfing. >> Hmm - so drive speed affects the problem. > Possibly. The jury is still out on that one as it will occasionaly > format a few tracks even at the correct speed. >> It couldn't be anything as silly as the test program not working >> correctly on 50Hz mains?? (I can't see that the drive would have any >> internal reference to mains frequency - the only CBM machine I know >> that can do that is the C64) >> Does the drive have a strobe disk on the spindle? > Nope. The drive electronics are DC only - no 50hz source. There is a > strobe disk. Making a cheap strobe light is stilll on the tp-do list. > Unfortunately I don't have a working scope at the moment. You don't need a fancy strobe - a fluorescent tube (Not a CF) in a dark room should be quite sufficient to get the stroboscopic effect - like the old western movies, where the wooden cart wheels of the wagon seem to be stationary, or spin backwards. There are usually two rings of strobe marks - one for 50Hz, one for 60. (often it's smeared a bit, because light from the different coloured phosphors in the tube decay at slightly different rates) >> Very weird. I've a full dance card right now (don't we all) - but I'd >> love to have a look at the ROM, and determine the formatting code on >> the drive.. I'm sure there roms exist on the 'net. > Right. I can see this becoming a 'mission' for me and an annoyance for > my wife in the next week as I should be doing other things to prep for > xmas. :-) Oh, I know that feeling well :) Julian > Rob > Message was sent through the cbm-hackers mailing list -- Best regards, Julian mailto:email@example.com Message was sent through the cbm-hackers mailing listReceived on 2012-12-02 00:00:37
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