PS/2 Model 25 repair info?

[Tony Duell]

> 
> On 31 Jul 2007 at 21:01, Tony Duell wrote:
> 
> > Form the PS/2 Hardware Interface TechRef...
> > 
> >         40 : +12V DC
> 
> That's really odd.  By the time the PS/2 was around, every 3.5" drive 
> that I can think of in current production at the time used +5 only.

I've not actually verified that voltage is present (I don't own any PS/2 
stuff), nor have I checked it's sued on the floppy drive (I do have one 
of the drives somewhere, I think).

I was given the Hardware Interface Techref by a friend who had no further 
use for it, and who knows I collect techncial manauls. As is well-knwon, 
this manual doesn't contain schematics, or ROM source listings, or 
anything that makes the old IBM PC family TechRefs really interesting, 
but of course I thanked said friend for the manual and added to the shelf.

The pinout I typed in last night was from a section on the floppy 
drive/controller subsystem. It's not Model 25 (or any other Model) 
specific. It's quite possible some machines don't provide +12V there, if 
none of the supported options for that connector would have needed it.

-tony