16 Sep
1998
16 Sep
'98
7:43 a.m.
Phil Clayton <handyman(a)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..?
Are they compatable, and has anyone used these drives in the old
CP/M's.?
Kaypro: yes
Osborne: I dunno
I'm thinking that the O1 has funny disk drives that need power
somewhere on the ribbon cable. But it's been a while since I had
one open to check, and am posting in the spirit of getting someone
else to jump in and correct me.
-Frank McConnell
16 Sep
16 Sep
8:58 a.m.
On 16 Sep 1998, Frank McConnell wrote:
Phil Clayton <handyman(a)sprintmail.com> writes:
You are correct. The Obsorne drives feed power on the drive data cable
and connecting them to other configurations tends to cause the 'magic
smoke' to escape...
I've even got a drive exerciser in the collection that has special
connections to support the Osborne drives...
-jim
---
jimw(a)agora.rdrop.com
The Computer Garage - http://www.rdrop.com/~jimw
Computer Garage Fax - (503) 646-0174
I have several old 360K floppy drives removed
from old XT's
is it possible to use these in my CP/M machines..?
Are they compatable, and has anyone used these drives in the old
CP/M's.?
Kaypro: yes
Osborne: I dunno
I'm thinking that the O1 has funny disk drives that need power
somewhere on the ribbon cable. But it's been a while since I had
one open to check, and am posting in the spirit of getting someone
else to jump in and correct me. 
9:18 a.m.
New subject: Osborne Floppy Drive compatability
James Willing wrote:
On 16 Sep 1998, Frank McConnell wrote:
OK I Thank everyone for the input.. Kaypro is no problem..
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...
Phil Clayton <handyman(a)sprintmail.com>
writes:
You are correct. The Obsorne drives feed power on the drive data cable
and connecting them to other configurations tends to cause the 'magic
smoke' to escape...
I've even got a drive exerciser in the collection that has special
connections to support the Osborne drives...
-jim I have several old 360K floppy drives removed
from old XT's
is it possible to use these in my CP/M machines..?
Are they compatable, and has anyone used these drives in the old
CP/M's.?
Kaypro: yes
Osborne: I dunno
I'm thinking that the O1 has funny disk drives that need power
somewhere on the ribbon cable. But it's been a while since I had
one open to check, and am posting in the spirit of getting someone
else to jump in and correct me. 
10:54 a.m.
New subject: Osborne Floppy Drive compatability
On Wed, 16 Sep 1998, Phil Clayton wrote:
James Willing wrote:
>
> On 16 Sep 1998, Frank McConnell wrote:
>
> > Phil Clayton <handyman(a)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
11:56 a.m.
New subject: Osborne Floppy Drive compatability
Don Maslin wrote:
On Wed, 16 Sep 1998, Phil Clayton wrote:
James Willing wrote:
On 16 Sep 1998, Frank McConnell wrote:
Phil Clayton <handyman(a)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...
2:03 p.m.
New subject: Osborne Floppy Drive compatability
On Wed, 16 Sep 1998, Phil Clayton wrote:
In reverse order, Phil, no I have not done it myself. However, I can see
no obvious reasons why it could not be done as the drive mechanisms must
be quite similar. It would require some fancy 'wire-weaving' though
considering drive placement.
- don
Don Maslin wrote:
>
> On Wed, 16 Sep 1998, Phil Clayton wrote:
>
**** snip ****
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
?
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donm＠cts.com -
fmc＠reanimators.org -
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jimw＠agora.rdrop.com