Osborne Floppy Drive compatability

From: Phil Clayton <handyman_at_sprintmail.com>
Date: Wed Sep 16 15:56:17 1998

Don Maslin wrote:
>
> On Wed, 16 Sep 1998, Phil Clayton wrote:
>
> James Willing wrote:
> On 16 Sep 1998, Frank McConnell wrote:
>
> Phil Clayton <handyman_at_sprintmail.com> writes:
> I have several old 360K floppy drives removed from old XT's
> is it possible to use these to replace my defective CP/M drives.?
>
> **** snip ****
>
> Then that brings me to the next question.
> Can I do some modification to my old XT drive to get it to work on the
> Osborne 01?
> Understand the Power in the ribbon thing..
> Does anyone have a pin-out if it can be done..?
>
> Thanks... Phil...
>
> Courtesy of the chap who sent it to me some time back:
>
> - don
>
>
> The disk controller chip used on the main logic board is the Fujitsu 8877,
> equivalent to the Western Digital 1793. The following pinouts apply to the
> disk cable connector on the main logic board.
>
> pin 1 GND
> 2 GND
> 3 GND
> 4 GND
> 5 GND
> 6 GND
> 7 GND
> 8 INDEX
> 9 GND
> 10 DRIVE SELECT 1
> 11 +12 volts
> 12 DRIVE SELECT 2
> 13 +12 volts
> 14 NC
> 15 +12 volts
> 16 4mhz clock
> 17 +12 volts
> 18 DIR
> 19 GND
> 20 STEP
> 21 +5 volts
> 22 WRITE DATA
> 23 +5 volts
> 24 WRITE GATE
> 25 +5 volts
> 26 TRACK 00
> 27 GND
> 28 WRITE PROTECT
> 29 GND
> 30 READ DATA
> 31 GND
> 32 SIDE SELECT
> 33 GND
> 34 LATE
>
> Figure 7.3 Main Board Disk Cable Connector Pinouts

Don:
Thanks very much for the info.. Are you saying that indeed the 360KB XT
floppy drives will work in the osborne 01, if I correctly modify the
cable ?
Have you actually done this yourself? Has anyone else done this before
?

Phil...
Received on Wed Sep 16 1998 - 15:56:17 BST