Osborne Floppy Drive compatability

From: Don Maslin <donm_at_cts.com>
Date: Wed Sep 16 14:54:44 1998

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 in my CP/M machines..?

**** 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
 
  
Received on Wed Sep 16 1998 - 14:54:44 BST