HP 9121

From: Tony Duell <ard_at_p850ug1.demon.co.uk>
Date: Tue Jun 10 19:13:12 2003

> While dumpster diving at the end of a radio rally (what,
> doesn't everyone do this?) I found, in with the usual PC
> scrap, an HP 9121 dual disk unit.

Right...

>
> The unit powers and a small LED flashes five times but
> that's as far as I've got because I've not got anything
> to plug it into.
>
> I take it I can use DSDD 3.5" disks in this and that with a

Yes. IIRC. the 9121 is actually a single-sided unit (the 9122 and 9123
being the double-sided versions), but obviously you can use DD disks in
it. It is double density, but not high denisty.

> General Instrument HPIB card and some hand rolled code I can
> try it out. Anyone done this? Any pointers to where to start?
> Any online docs for the command set/protocols?

It's going to be either SS/80 or Amigo protocol (I forget which). And
I've never found docs one either on-line (I have some printed
documentation from HP on this, which I guard with my life -- it's that
hard to find!).

-tony
Received on Tue Jun 10 2003 - 19:13:12 BST