stevendd@sage.cc.purdue.edu (Doug Stevens) (03/28/91)
I finally desided to upgrade my single sided drive, I just got the new drive today. I thought all I had to was swap drives. The plug from the small board in the drive case isn't the same as the one one the drive. The connector on the board is for 14 pins, the drive connector is 34 pins. I rember reading some of the early single sided drives used an old kind of connector (guess what kind I got). If you know how to convert the plugs I would be very appreciative. Thanks. - Doug
Roger.Sheppard@bbs.actrix.gen.nz (03/29/91)
Distribution:world In article <8889@mentor.cc.purdue.edu> stevendd@sage.cc.purdue.edu (Doug Stevens) writes: > I finally desided to upgrade my single sided drive, I just got the new drive > today. I thought all I had to was swap drives. The plug from the small board > in the drive case isn't the same as the one one the drive. The connector on the > board is for 14 pins, the drive connector is 34 pins. I rember reading some of > the early single sided drives used an old kind of connector (guess what kind I > got). If you know how to convert the plugs I would be very appreciative. > > Thanks. > - Doug Well you will find a small PCB with a CPU fitted on it, all this has to be removed, and you relace this with the 34 IDC connector, this CPU was a Atari copout for some drive that stept at 6 ms, the CPU take the Atari 3 ms , step pulses and buffers things up and gives out 6 ms step pulses, Note, one other feature is that you can't go over 80 tracks with this CPU fitted, and there is no side select fitted either. So remove the lot, and wire the 34 pin connector to the Main PCB... -- Roger W. Sheppard 85 Donovan Rd, Kapiti New Zealand...
keithb@hemel.bull.co.uk (Keith Bedford) (04/02/91)
stevendd@sage.cc.purdue.edu (Doug Stevens) writes: >I finally desided to upgrade my single sided drive, I just got the new drive >today. I thought all I had to was swap drives. The plug from the small board >in the drive case isn't the same as the one one the drive. The connector on the >board is for 14 pins, the drive connector is 34 pins. I rember reading some of >the early single sided drives used an old kind of connector (guess what kind I >got). If you know how to convert the plugs I would be very appreciative. I recently upgraded a 520 STFM to a D/S drive. The 14-pin connector comes off a small (aprox 3" by 3") pcb that is no longer required - unscrew the pcb and you should find a 34-pin connector going into it. Disconnect the small pcb and the free cable SHOULD now connect straight to your new drive. I had to twist the cable through 90 degrees to get the right polarity, if you get it wrong the drive light will stay on permanently but do no damage. The pcb is no longer required and can be stored/junked with the SS drive. This worked for me, I can't guarantee it will work for you. If your ST goes into orbit when you switch on I'm real sorry but it's not my fault. ============================================================================== Keith Bedford keith.bedford@hemel.bull.co.uk Bull HN Information Systems Ltd Maxted Road - UK03-HM14 Hemel Hempstead Herts HP2 7DZ England +44-442-232222 ext 4520 ==============================================================================