HP 9122 floppy drive

[Harvey White]

I have one of these, more of a gift than not.

Internally, the floppy seems to be a 26 pin interface, 4 pin power,
3.5 (??) inch drive. However:

1) the "standard" IBM size disk does not fit in, making me think that
I am dealing with another HP "Standard" product. The drive is a sony,
and that also makes me think that I've got a "standard" product.

I suspect that these are an early variety of floppy disk that is
probably no longer produced. It would figure, since that's what I
need to store setups on my 1631D logic analyzer.

<grumble at the situation>

Anybody know where to get these disks, and even if they are still
available?

Or just as good, anybody got enough data on the drive (including
pinouts) so I can swap a standard dos drive in there and make a 26 to
34 pin adapter... assuming that it doesn't take 6.87 and 14.385 volts
as supply....

I don't care about data interchange, just storing the logic analyzer
setups on the disk. I can also put in a separate "standard" disk
drive, if needed.

Harvey

 

[Michael Gray]

HP9122 = 360K Single sided, single density.
Sony drive unit.
I used to cover up the hole on a DS diskette to fool it.
Worked sometimes, not others.
A 'Write-protect" tab from a 5+1/4" floppy did the the trick.
I also seem to remember having some success replacing the drive with a
new DS/DD unit.
Of course, the system could only understand the disks if they were
formatted as single-side/single density, but there are options on the
DOS Format for that. (on another machine)

 

[Matthieu BENOIT]

I don't know if it mazy helps but:
I have some 5 " 1/4 floppies single sided that could be used
with microcomputer as Apple ][.
If you want some just contact me , I may arrange to ship you
one.
brand is DISTAR or HO SHING HD55-A.
I may have diagrams of the pinout connections as well.
Also, I have an 5"1/4 floppy P/N U240B041-04 by Mitsubishi Electric
NAMFS2 rotative motor is 12V and driven by a M51795SP chip.
Computer (it includes a Mitsubishi M52812FP chip and M52803P (datecode
are not clearly indentifiabled but it seems quite old (comes from a
Compaq computer)
there are jumpers called SR, PM2, DC, RI, MM, MS, IS, IL, HR, DD, IU,
TD,DS2, DS1, DS0, MX, DS3

@+
regards.
MB.

 

[Harvey White]

HP9122 = 360K Single sided, single density.
Sony drive unit.

Got that far with it, so thanks.

I used to cover up the hole on a DS diskette to fool it.
Worked sometimes, not others.
A 'Write-protect" tab from a 5+1/4" floppy did the the trick.

Not too worried about that, since I actually have some of the older
floppies somewhere.

I also seem to remember having some success replacing the drive with a
new DS/DD unit.

Now that I think I will investigate. The drive seems to be a bit odd,
and I'm not sure if the upper head is working. Seems that if the
drive mechanism freezes (because of the lubricant drying out) you can
easily damage the upper head of the drive.

Of course, the system could only understand the disks if they were
formatted as single-side/single density, but there are options on the
DOS Format for that. (on another machine)

I'll look into this. I found the pin connections on a Japanese site,
but since he copied the definitions from the spec sheet, and Japanese
uses english for them, I'm ok without having to translate the
Japanese.

This uses a 26 pin cable, and I can just go make a 26 to 34 pin
adaptor if I need to.

Harvey