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Re: Fixing the Roland CM-500 Vibrato Bug

I've just finished this mod and it really is very straightforward. Taking my time with the soldering work, in total it took just under an hour - including dumping of the ROM & downloading a patching utility etc. What can I say? It's perfect. 👍 Thanks for sharing the great work! 😀

Re: How to: IBM 4865 external 720k floppy drive (Alps DFL413C02B) head alignment

It's quite possible that once you get a track somewhere in the middle working ok, that the others will then all be good (or at least close), except track 0, and you can then adjust the track 0 sensor. BUT... if it was me, I wouldn't touch it until I get a real 720k disk (ideally an original software …

Re: How to: IBM 4865 external 720k floppy drive (Alps DFL413C02B) head alignment

Actually that first pic looks like a perfect read of track 0. The first column (with all the 0's) shows the track ID actually read from the disk. You can ignore the second column which is the sector being read. The third column is the number that matched the seeked track ID; the fourth is those that …

Re: How to: IBM 4865 external 720k floppy drive (Alps DFL413C02B) head alignment

PS... I've also used ImageDisk on an old 5.25" drive that had an issue with the top and bottom heads being out of alignment with each other. I have to say that it's really VERY satisfying when you successfully realign the heads, hear those high pitched beeps in IMD, and end up with a working drive. …

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