Hi Martin, Thanks for the pictures but no joy I'm afraid. I had 5 x 8050's around here, all with Micropolis drives. 1 x 901482-03, 901482-04 and 901483-03 RRIOT 3 x 901482-07, 901482-06 and 901483-03 RRIOT 1 x 901887-01, 901888-01 and 901885-04 RRIOT Cheers, Rob On 14/03/2014 17:10, Martin Hoffmann-Vetter wrote: > Hello Rob, > >>> Don't know exactly what looks like tandon drives for 8050/8250 but >>> they have a different floppy locking system as regular ones. >>> Micropolis locking system have a sort of rectengular push button. To >>> load the floppy disk, you push the disk into the unit, then, when you >>> push (quite heavily) the button, the entire drive mecanism rotates to >>> complete lock. To remove the floppy, you push (quite heavily) again >>> the rectengular buton and the entire mecanism rotate back but does >>> not eject the disk; you have then to pull the buton to eject the >>> disk. >> I took a look at the service manual and they all look rather similar >> from the outside. > Yes, the Tandon drives are shown as the MPI or Shugart drives. But some Micropolis drives look likes so, too. > > An other point is the type label on the rear side. Some units are labeled as 8050M or 8250M. This M means Micropolis or MPI. So if you find a unit labeled with 8050M or 8250M this isn't a tandon drive. > > If you look into a drive (where the disc is interted) you can see some differences between the drive types. But that isn't easy. So you must compare some drives. > >> I'll venture up into the attic with a screwdriver >> and a camera and over the weekend to see what I have. > If you open a 8050 or 8250, you can identify a tandon drive with the analog board. This isn't only on one drive. It's bigger ... > > See some picture from inside a 8050/8250 drive: > > MPI and Micropolis: http://www.cbmhardware.de/floppy/cbm8050.php > MPI: http://classiccmp.org/dunfield/pet/h/d8050o.jpg and http://classiccmp.org/dunfield/pet/h/d8050b.jpg > Micropolis: http://classiccmp.org/dunfield/pet/h/d8250i.jpg and http://classiccmp.org/dunfield/pet/h/d8250b.jpg > Tandon: http://www.vintage-computer.com/vcforum/attachment.php?attachmentid=12320&d=1363656089 (must be register at vintage-computer.com) > > Martin > > BTW: If you open some drives and look into, can you look at the DOS roms, too? There are two version from DOS 2.5 (only 8050) with 901482-03/901482-04 and 901482-06/901482-07 and one version of DOS 2.7 (8050 or 8250) with 901487-01/901488-01 known. If you find an other version, it would be great to dump this, too. > > > Message was sent through the cbm-hackers mailing list Message was sent through the cbm-hackers mailing listReceived on 2014-03-14 20:00:02
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