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.
There are at least two versions. One is the white square box about 13"
I'll raise that to 3 versions at least :-)
I have found a manaul called "HP's 3 1/2-Inch Flexible Disc Drive Service
Documentation". It's pretty content-free, the main useful part is the
appendix giving the Amigo command set, at least for floppies.
Anyway, this manual has a section on the drive itself (the single-head
Sony full-height one), no schematics and sections on the 9121, 9133A/B,
9133V/XV units. The latter have partial PSU scheamtics, you're refered to
the Winchester Disc Service Manual for the rest of the PSU (which, alas,
I don't have :-().
The 9133A is the all-metal case with rounded ends. It contains 2
separate controllers (floppy and winchester), linked to a common HPIB
connector. Seprate address switches for the 2 controllers
The 9133V is in the plastic-topped case. Again separate controllers. The
floppy controller is 2 stacked boards (to get it in the case!). The HPIB
connector is on the winchester controller board, but there's an internal
HPIB link to the floppy controller. Again separate address switches.
Then there's the 9133H that I have. It's got one controller board with
one HPIB interface and one 98B09 processor. It controls both the floppy
and the winchester. One address swithc of course.
Intrerstingly, the manaul I have gives component lists for the floppy
controller boards. All 3 (9121, 9133A, 9133X) seem to be very similar and
use the same firmware ROM.
-tony
