Semi-OT? HP 1630G Logic Analyser (grabbers, invasm packs & disk

[Tony Duell]

> CPU instruction sets. What I do not have, though, is either the
> appropriate disk drive set (HP 9121S or 9121D, according to the manual)
> nor any of the invasm packs.

The difference between the -S and -D is that the former is a single 
drive, the latter is a double. They're both single-sided 3.5" drives, 
IIRC usiong something odd like 70 tracks.

IIRC the controller board, case, etc are the same between the 2 versions 
(there may be a link to shift). The -S has a little space to store disks 
where the second drive would go. 

[...]

> There's a 9121D on eBay (6 days out) for $60 w/shipping, which is...
> do-able but seems a shade hefty. Maybe they're getting harder to find
> these days, I don't know. As for the invasm packs, for all I know they're

I didn;t think the 9121 was particularly hard to find, but that may be 
becasue I am overrun with them (I think I have 5 9121Ds...) It is 
remarkably heave fro its zize, though (it's built in a metal chassis, 
there's a big mains transformer (linear PSU), etc), which might explain 
any high shipping charges.

-tony