IBM external 3,5" DD Floppy 4865

[Frank Ebinger]

Hello PS/2 Fan´s!

I need some Information over a External Floppy Type 4865. It is a DD-Floppy
with
3,5" Format. Same Connector like a External Sysgen Bridge-Tape Streamer and
a
Irwin 4100 Controller. (37 pin) but it doesen´t work on the Irwin Contr.
At the Connector of the Floppy is a short Cable with 4- pin Connector!
(External Power-
Supply?)
Wich kind of Controller I need for this External Floppy 4865??

Inside there is a full heigt 3,5" Floppy drive from Alps (DD); it may be the
same like
in the PS/2 Modell 30/25!?

Thanks!
Frank

[Gereon Wenzel]

Got something like this too,
but no power connector?
Tried not working on a 5,25 Adapter.
looks like it uses power through the 37 pin connector,
provided by a special IBM Adapter?
Will continue testing with another IBM Floppy adapter.
Will report results later in this NG.

Gereon W.

BTW. Anyone here knows if the external 5,25 use any special drivers,
maybe genenic DOS Driveparm or if it shows up in the Reference disk
device list?
I didn't get mine working, but allready have 2 internal drives.

Frank Ebinger schrieb:
>
> Hello PS/2 Fan愀!

>
> I need some Information over a External Floppy Type 4865. It is a DD-Floppy
> with
> 3,5" Format. Same Connector like a External Sysgen Bridge-Tape Streamer and
> a

> Irwin 4100 Controller. (37 pin) but it doesen愒 work on the Irwin Contr.

[Tim Clarke]

> > I need some Information over a External Floppy Type 4865.
> > It is a DD-Floppy with 3,5" Format.
> > Same Connector like a External Sysgen Bridge-Tape Streamer and

> > a Irwin 4100 Controller. (37 pin) but it doesen´t work on the Irwin

Contr.
> > At the Connector of the Floppy is a short Cable with 4- pin Connector!
> > (External Power-Supply?)
> > Wich kind of Controller I need for this External Floppy 4865??
> >
> > Inside there is a full heigt 3,5" Floppy drive from Alps (DD); it may be
the
> > same like in the PS/2 Modell 30/25!?

This sounds like something for a PC/XT or PC/AT, when the 3.5" drives began
to be more common.

> Got something like this too,
> but no power connector?

IBM 3.5" floppy drives usually accept power through the 34 or 40-pin cable,
but there are various drives. The "standard" model 95, 5.25" slim-high,
electronic eject, drive has the usual 4-pin power connector.

> Tried not working on a 5,25 Adapter.
> looks like it uses power through the 37 pin connector,
> provided by a special IBM Adapter?

The IBM external floppy controllers (360KB and 1.2MB versions) do supply
power via the DB37 connector.

> Will continue testing with another IBM Floppy adapter.
> Will report results later in this NG.
>
> Gereon W.
>
> BTW. Anyone here knows if the external 5,25 use any special drivers,

> maybe generic DOS Drivparm or if it shows up in the Reference disk
> device list?
> I didn't get mine working, but already have 2 internal drives.

Then you need a special extra driver and some way (e.g. an adapter, like the
Sysgen ones) to have a 3rd "Drive Select" and "Motor Enable", unless using a
Model 95.
--
Cheers,
Tim

[David L. Beem]

Hi Tim, Gereon, Frank,

> This sounds like something for a PC/XT or PC/AT,
> when the 3.5" drives began to be more common.

IBM Wheelwriter option. There was a way to attach it to the computers
above too (I think I have an IBM insert for the AT manual showing it). I've
got a version with the power lead I can open for pinouts if needed.
David
Da...@gilanet.com

[Gereon Wenzel]

> This sounds like something for a PC/XT or PC/AT, when the 3.5" drives began
> to be more common.

Got an MFM controller with external DB37 will try this.

> > Tried not working on a 5,25 Adapter.
> > looks like it uses power through the 37 pin connector,
> > provided by a special IBM Adapter?
>
> The IBM external floppy controllers (360KB and 1.2MB versions) do supply
> power via the DB37 connector.

Didn't you mean don't ?
the 5,25 have own power supply

> Then you need a special extra driver and some way (e.g. an adapter, like the
> Sysgen ones) to have a 3rd "Drive Select" and "Motor Enable", unless using a
> Model 95.

The 95 should support 3 Floppies, at least there listed as Ref dev list.
Problems are known with 95 from prior postings in this group.
Due to the external drive using a separate controller there should be no
problem to get the signals?

Still is the question if a external 5,25 shows up on the Ref device
list,
if connected to a separate controller (not the bridge board)?

Gereon

[Frank Ebinger]

Hello David!

I´m interested in the Pinout! Do you have it?

Frank

"David L. Beem" <Da...@gilanet.com> schrieb im Newsbeitrag
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