Closely related to the previous post : I actually have an ST419, but is in use inside a HP9133D.
Looking back to old classiccmp articles indicate that it is not easy to replace the ST419 by other MFM drives of different geometries.
Has this changed ? i.e can somebody report a success in replacing the internal drive of an HP9133 ?
Jos
Ok, thanks to many people calling my foul on terms of how the drive
works, I have figured out what I need to get it up and running for the
most part.
I wired up a power connector for the spindle motor and verified (first
with a meter, then by applying power) that indeed the spindle motor
works properly.
Now: I could use verification that the diagram for wiring the 50 pin 8"
shugart connector to the 36 pin 5.25" shugart connector which is in the
cp/m faq (http://www.faqs.org/faqs/CPM-faq/) is correct.
Secondly, I cannot source one of those ?locking? Shugart DC power plugs
to fit into the connector, the connector which looks like (paste in
notepad):
_________
| |
| 0 0 0 |
|__ ____|
__| |____
| |
| 0 0 0 |
|_________|
I'm wondering if I should just solder wires to the pcb to supply gnd, 5v
and 24v, or does someone know where I can get one of those plugs which
mates with that connector, or perhaps has one spare?
Thirdly, what should I set the jumpers and fuse-block to, to allow this
to work properly with a catweasel or anadisk?
Thanks for all the help so far!
--
Jonathan Gevaryahu
jgevaryahu(@t)hotmail(d0t)com
jzg22(@t)drexel(d0t)edu
-- ethan.dicks at usap.gov wrote:
>On Wed, Oct 29, 2008 at 10:56:13PM +0000, jeff.kaneko at juno.com wrote:
>> Geez, the 419 was uncommon, even in it's own time.
>
>Indeed. I don't ever recall running across one.
>
>> There's some difference (which I have been unable to quantify)
>> between different models of MFM drives (of equal or similar
>> geometry) that allows some drives to work in some applications,
>> but not others.
>>
>> If there's anyone out there intimately familiar with the
>> ST-506/412 interface, now would be a good time to offer
>> some suggestions as to why this is so.
>
>If you had to play with MFM and RLL drives back in the day,
>there were *four* drive geometry parameters you had to match
>up with what your controller/firmware was expecting:
>
>Cylinders
>Heads
>Write Precomp
>Reduced Write Current
>
>RWC was important with the ST-506 standard, but, IIRC, it fell
>away with the ST-412 standard, and the pin that the controller
>used to tell the drive to reduce the write current was recycled
>as another head-select line, allowing an ST-412-compatible drive
>to have 9-16 heads. More modern drives kept track of which track
>they were on and handled RWC internally, sometimes based on the
>Write Precomp value, I think.
A-HA! I think you nailed it! That explains why you could use
an older drive that could be used with an XT controller,
on an AT comntroller, but *NOT* vice-versa! I was totally
unaware that the fourth head-select line on the bigger drives
had been previously used for RWC.
>
>I don't know anything about the HP9133D, but I did fiddle with
>plenty of MFM and RLL drives on ISA controllers and non-PC
>controllers (DEC RQDXn, Commodore D9060/D9090, Dialog DQ614, etc.,
>etc.) There was no hard and fast rule that X drive could always
>be replaced by Y drive of a larger size, but there were many
>specific cases where it worked - one I've done is replacing a
>Tandon TM602S with a Seagate ST225 in a Commodore D9060. They
>have the same number of heads (4), and although the ST225 is 20MB
>and the TM602S is 5MB, what you end up with is a 75%-unused
>ST225, and there's no conflict between the Write Precomp and the
>RWC parameters.
OKay, looks like the 9133 wants a drive that supports RWC (or,
at least, does not have a fourth head select bit!). Looks like
the write precomp has to match also. Wow, I must have led a
sheltered life: This is the first instance I've seen where the
RWC and precomp actually have a discernable effect.
I'll have to consult my drive guide to confirm this . . . .
Thanks Ethan!
_____________________________________________________________
Find the apartment of your dreams by clicking here now!
http://thirdpartyoffers.juno.com/TGL2121/fc/Ioyw6i3miigqNmkWe4aQzJukOnbX02v…
I offered some stuff here as free for shipping. They were claimed, but
the claiments seem to have disappeared. This is your last call. All of
this stuff is packed and ready to go.
I'm starting a "Free For Shipping" page at
http://frotz.homeunix.org/freestuff/ beginning with the below-listed
items. Does anyone have a cleaner idea for doing this? Is the classic
computer marketplace back up?
* Morrow MicroDecision 3 with two extra motherboards. When turned on, the
power supply hums but nothing else happens. Maybe with the two spares
boards you can fix it. Two floppy drives are present. I never got a
reply from the one who wanted this. Weight 25 pounds.
* UniPlus UNIX manual set. It seems complete. This one was offered in
March. Claiment was contacted a couple weeks ago who still expressed
interest (you know who you are). Weight 11 pounds.
* Empty 8-inch floppy drive cabinet with power supply. I forgot who
wanted this one, so I'm tossing it to you. First email gets it. Weight
13 pounds.
--
David Griffith
dgriffi at cs.csubak.edu
A: Because it fouls the order in which people normally read text.
Q: Why is top-posting such a bad thing?
A: Top-posting.
Q: What is the most annoying thing in e-mail?
On Ebay auction number 110304716214 is what is claimed to be a keyboard
for assorted Wyse terminals with an RJ-9 jack. However the keyboard shown
looks more like a VAXstation / vt220 keyboard. I'm not talking just about
the layout, but the case too. I have some VAXstation keyboards already.
Dare I try them with my Wyse 99GT?
--
David Griffith
dgriffi at cs.csubak.edu
A: Because it fouls the order in which people normally read text.
Q: Why is top-posting such a bad thing?
A: Top-posting.
Q: What is the most annoying thing in e-mail?
I have a package containing five DIGITAL 5 1/4 Floppies as follows
BJ-P598-RV SELECT/V2.30 MASTER BIN RX18 LIC. TO DIGITAL EQUIP. CORP.
DIGITAL TESTED 1981 SELECT INFO. SYS. INC.
RJ-P599B-RV SELECT/V2.30 SUPERSPL BINRX18 LIC. TO DIGITAL EQUIP. CORP.
DIGITAL TESTED 1981 SELECT INFO. SYS. INC.
BJ-P600B-RV SELECT/V2.30 INST/TCH BINRX18 LIC. TO DIGITAL EQUIP. CORP.
DIGITAL TESTED 1981 SELECT INFO. SYS. INC.
Copy Working Installed Select Master
Copy Working Select Install/Teach
If any one is interested E-Mail me and we can discuss them
Bob in Wisconsin
Does anyone here know anything about the ADDS VP90 serial terminal? I'd
like to somehow find a keyboard for it and get rid of it.
--
David Griffith
dgriffi at cs.csubak.edu
A: Because it fouls the order in which people normally read text.
Q: Why is top-posting such a bad thing?
A: Top-posting.
Q: What is the most annoying thing in e-mail?
I have a Qume DT-8 8" DS drive here which I'm trying to restore/repair
to dump a number of 8" floppies, but I lack the manual and schematic for
it, and I have no idea what the pinout for the data/power/spindle
drive/etc connectors is. It doesn't use a standard shugart connector for
data at least, its a 50-pin thing, so I'll need to make some sort of
pinout converter once I know the proper pinout. The 2 terminators are
both installed.
I do know the drive needs 5v and 24v to run, and I'm not about to power
it up without checking EVERYTHING first. I'm also missing the funny
3-pin and 6-pin molex-like connectors used to supply power to the pcb
and the spindle motor, if anyone has any spares.
--
Jonathan Gevaryahu
jgevaryahu(@t)hotmail(d0t)com
jzg22(@t)drexel(d0t)edu
It's old post but if you are still looking for a STR-LINK II let me know.
STR LINK IIa
Jack Gershon jgershon at steelindustriesinc.com <mailto:cctech%40classiccmp.org?Subject=STR%20LINK%20IIa&In-Reply-To=>
Fri Aug 8 09:40:42 CDT 2003
* Previous message: Retro printer ribbons still up for grabs <017922.html>
* Next message: Interesting Burroughs Photo Site <017905.html>
* Messages sorted by: [ date ] <date.html> [ thread ] <thread.html> [ subject ] <subject.html> [ author ] <author.html>
I saw a post of yours from last year.
I have a manual for this item if you still require it.
I am actually looking for a replacement for our STR LINK IIa, or at the very
least, the belt for the tape drive on it.
Jack
* Previous message: Retro printer ribbons still up for grabs <017922.html>
* Next message: Interesting Burroughs Photo Site <017905.html>
* Messages sorted by: [ date ] <date.html> [ thread ] <thread.html> [ subject ] <subject.html> [ author ] <author.html>
More information about the cctech mailing list <http://dewey.classiccmp.org/mailman/listinfo/cctech>
GE Aviation
____________________________________________________________________________________________________________________________________________________________________________________
b
Bob Galipeau
Cell Support Leader
Plant IV Maintenance
General Electric Company
1000 Western Ave MD 164M1
Lynn, MA 01910
* Phone: (781) 594-6426 dial comm 263-6426
* Mobile: (781) 858-5998
* Fax: (781) 594-7815 dial comm 263-7815
* E-mail: robert.galipeau at ge.com
Does anyone have documentation for the later MS780-E, based on the M8375/76 modules? I have the engineering drawings (thanks, Bitsavers!), but I'd like to find documentation similar to what exists online for the earlier subsystems (the 1978 docs). I'm troubleshooting a MS780-E in a VAX-11/785, and I'd like to understand just what I'm supposed to do about that glaring red LED (it's a misconfiguration indicator of some sort). I'm getting SBI errors while trying to run the diagnostics, and the memory subsystem seems the likely culprit. Thanks! -- Ian
