2 Apr
2005
2 Apr
'05
3:47 p.m.
I don't remember where I found that but it
looks like HP uses a
common board for the various models and sets the capacity to match the
drive via the jumpers.
I beleive there are at least 2 main versions -- the older one in the
all-metal case (which, IIRC had separate floppy and hard disk controller
boards, linked ot the same HPIB connector) and the later one in the
'shoebox' with the plastic front/top cover.
I have only the latter. There's a set of 4 links on the controller PCB
that are labelled 'Ident Sra'. They link to an input port on the 6809
bus, and seem to define the drive geometry. I do know that this is
checked on power-up, and if the link setting doesn't match the drive, you
get an error. I presume there's a look-up table in the firmware
somewhere, but I've not looked for it yet.
-tony