14 Aug
2014
14 Aug
'14
7:53 p.m.
I have a lovely HP 9825B desktop "calc-puter," the "T" version which
includes a number of ROMs that would have come on a cartridge in the
earlier models. There are a number of ROM carts and interfaces on
ebay for the 9825s, among them the "98217A Flexible Disk Drive" module
and the 98034A HPIB interface.
My question is: is the latter interface, along with the General and
Extended I/O ROMs already built into the 9825B, sufficient to talk to
HPIB floppy drives? Or do I need the 98217A, or some other ROM, to
add the disk routines to HPL?
The 98217A says it's specifically for the 9885M 8" disk drive. I
don't know if it has other applications or not. I don't have a 9885M
or the interface module that would be required.
Thanks for any clues...
-j
14 Aug
14 Aug
8:54 p.m.
On Thu, Aug 14, 2014 at 7:53 PM, Jason T <silent700 at gmail.com> wrote:
I have a lovely HP 9825B desktop
"calc-puter," the "T" version which
includes a number of ROMs that would have come on a cartridge in the
earlier models. There are a number of ROM carts and interfaces on
ebay for the 9825s, among them the "98217A Flexible Disk Drive" module
and the 98034A HPIB interface.
My question is: is the latter interface, along with the General and
Extended I/O ROMs already built into the 9825B, sufficient to talk to
HPIB floppy drives? Or do I need the 98217A, or some other ROM, to
add the disk routines to HPL?
Disclaimer: I'm not an expert on these systems. I don't have one and
have never used one. All I know is what I've read in manuals. From
what I can tell you you would want a 98228A ROM instead of a 98217A
ROM to connect to a 9895A HP-IB disc drive (or an HPDrive emulated
one).
http://www.hpmuseum.net/display_item.php?hw=166
http://www.hpmuseum.net/exhibit.php?hwdoc=166
9825DiscProgramming-09825-90220-98pages-Aug80.pdf 1.471 MB
HP9895 Disc Memories
The 98228A Disc ROM in a 9825T Computer is required to control 9895 drives.
Addressing Disc Drives
The 9895 drive is supplied from the factory set to respond to device
address 00. The 98034A HP-IB interface is supplied set to select code
7. Since the 98228A Disc ROM default address is 707, however, be sure
to change the 9895 device address to 07 before executing other disc
operation.
9:23 p.m.
On Thu, Aug 14, 2014 at 10:54 PM, Glen Slick <glen.slick at gmail.com> wrote:
what I can tell you you would want a 98228A ROM
instead of a 98217A
ROM to connect to a 9895A HP-IB disc drive (or an HPDrive emulated
one).
http://www.hpmuseum.net/display_item.php?hw=166
http://www.hpmuseum.net/exhibit.php?hwdoc=166
9825DiscProgramming-09825-90220-98pages-Aug80.pdf 1.471 MB
HP9895 Disc Memories
The 98228A Disc ROM in a 9825T Computer is required to control 9895 drives.
Ah ha - I believe we're on the right track now. Here is the module:
http://www.hpmuseum.net/display_item.php?hw=559
Seems like the ROM I mentioned still required a utility tape to format
disks and also used a different format. While I don't have the drives
the 98228A module was made for, one of them is an "AMIGO" command set
drive, so that suggests others that I do have may work as well. Also,
there's the HP9845 project that allows a PC with HPIB card to emulate
many HP drives.
So now to set an ebay saved search for that module....thanks!
-j
1:32 p.m.
On Fri, Aug 15, 2014 at 1:30 AM, Rik Bos <hp-fix at xs4all.nl> wrote:
And now "Patient my young padawan, patient..."
The HP 98228A Rom is a rare one, you need to be lucky to find one.
And it will only work in the HP 9825T.
Just curious, has someone dumped the contents of the various ROM
cartridges? How difficult would it be to build a equivalent cartridge?
From a quick look at Tony's schematics for the 9825
ROM cartridges
they are basically just address latches, address decoders, and ROMs
for what he calls Type 1 cartridges. I've never designed any PCBs to
be fabricated but it looks like that wouldn't be too difficult to
duplicate if the cartridges just plug into normal card edge
connectors.
2:07 p.m.
I have a lovely HP 9825B desktop "calc-puter," the "T" version which
includes a number of ROMs that would have come on a cartridge in the
earlier models. There are a number of ROM carts and interfaces on
ebay for the 9825s, among them the "98217A Flexible Disk Drive" module
and the 98034A HPIB interface.
IIRC the 9825T has all the ROMs apart from Matrix and either of the disk
ROMs. You get Strigns, Advanced Programming, etc built in
My question is: is the latter interface, along with the General and
Extended I/O ROMs already built into the 9825B, sufficient to talk to
HPIB floppy drives? Or do I need the 98217A, or some other ROM, to
add the disk routines to HPL?
IIRC the 98217 is for the 9885 drive only, whcih is conencted by the
98032 parallel interface. As an aside, the communcations protocol for the
9885 is not docuemtned in any maula that I've seen, I think it's possible
to deduce it from the publised routines in the HP9000/200 Pascal
technical manuals, but...
There is anotehr disk ROM. HP98228. It's a much larger ROM, it's
bank-switched (inside the module) to fit it into the avaialble address
space. That one, I think, works with HPIB drives.I am told it is very
hard to fid, though.
-tony
3:37 p.m.
On Fri, Aug 15, 2014 at 4:07 PM, Tony Duell <ard at p850ug1.demon.co.uk> wrote:
IIRC the 98217 is for the 9885 drive only, whcih is
conencted by the
98032 parallel interface. As an aside, the communcations protocol for the
9885 is not docuemtned in any maula that I've seen, I think it's possible
to deduce it from the publised routines in the HP9000/200 Pascal
technical manuals, but...
Well this is slightly embarassing....I knew I had some sort of
non-HPIB HP floppy drive downstairs. I just went to search for it
and...it's a 9885. So, in theory, if I got the parallel interface (a
few for $50 on ebay now) and the 98217, I'd have a complete system.
That is, if the drive works and I found the (also rare) formatter
tape.
It would see it would be better to hold out for the HPIB-enabled 98228
ROM, or as Glen says above, maybe someone will clone it.
Fortunately this is only a hobby and there are plenty of other
projects to attack. This one can wait :)
-j
3:43 p.m.
There is anotehr disk ROM. HP98228. It's a much
larger ROM,
it's bank-switched (inside the module) to fit it into the
avaialble address space. That one, I think, works with HPIB
drives. I am told it is very hard to fid, though.
Just to expand on that a little, the HP98228A supports both the
9885 and the 9895 floppy drives, the former using a parallel
GPIO interface, and the latter an HP-IB interface. By extension,
the 98228A is also required to support the 9134A which is a
Winchester drive that emulates 4 9895 drives over HP-IB.
BLS
9:07 p.m.
On Friday, August 15, 2014 at 22:07, Tony Duell wrote:
As an aside, the communcations protocol for the 9885
is not docuemtned
in any maula that I've seen....
Command and status words for the 9885 appear in Appendix A of the
"12732A/12733A Flexible Disc Subsystem Diagnostic Reference Manual" (12732-
90003 December 1977) for the HP 1000. The "HP 12732A/12733A Flexible Disc
Subsystem Operating and Service Manual" (12732-90005 October 1978) for the
1000 details the cabling between the CPU's parallel interfaces and the 9885
drives on page 2-7.
-- Dave
3763
days inactive
3764
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8 comments
6 participants
participants (6)
-
ard＠p850ug1.demon.co.uk -
blstuart＠bellsouth.net -
glen.slick＠gmail.com -
hp-fix＠xs4all.nl -
jdbryan＠acm.org -
silent700＠gmail.com