5 Sep
2005
5 Sep
'05
2:18 p.m.
I recently won an HP82915 Modem on E-bay (my first, and so far, only
purchase there). I was suprised to get it for the opening bid, I though
I'd have at least one other HP collector to contend with. It is, you see,
the internal modem for the HP Integral.
Anyway, it's a single PCB that fits into one of the Integral's expansion
slots. Cotnains about 20 ICs, most of which I recognise. One odd thing is
that the serial chip used is an 8250, a somewhat odd choice for a
68000-based machine.
Does anyone here know anything about using it? The Integral manuals I
have mention it exists, say it installs like any other board, and that
you need a normal 'modular phone cable' to link it to the phone line.
Nothing I'd not worked out by myself.
Incidentally, I have no intention of linking it to a public phone line,
I just want to connect it to another modem. I suspect it'll work withont
any DC voltage on the line, if not, that's easy to fix.
Did anyone, though, have a cheap/homebrew device to link 2 modems
back-to-back, doing things properly with dial and ring tones, etc?
-tony
6 Sep
6 Sep
2:51 a.m.
At 10:18 PM 9/5/05 +0100, you wrote:
I recently won an HP82915 Modem on E-bay (my first, and
so far, only
purchase there).
Tony? E-bay?? Now I know the end of the world is coming! :-)
I was suprised to get it for the opening bid, I though
I'd have at least one other HP collector to contend
with. It is, you see,
the internal modem for the HP Integral.
Darn you! I keep a constant watch on E-bay for Integral stuff but I
didn't see it!
Anyway, it's a single PCB that fits into one of the Integral's expansion
slots. Cotnains about 20 ICs, most of which I recognise. One odd thing is
that the serial chip used is an 8250, a somewhat odd choice for a
68000-based machine.
Does anyone here know anything about using it?
Not much. It's a 300/1200 Baud modem. ONE sales brochure list it in ONE
place but give NO details or pictures and never mentions it again. The
service manuals don't give ANY details about it. (It's one of those "If it
fails, replace the CCA. If it still fails, replace the whole thing."
procedures.) To test it they have you install two modems in the IPC and
plug them into separate phone lines and call one from the other while
running the diagnostics program. The diagnostics program will report No
Carrier, No Dialtone and the like but that's all. There no mention of a
null-modem type cable.
Joe
The Integral manuals I
have mention it exists, say it installs like any other
board, and that
you need a normal 'modular phone cable' to link it to the phone line.
Nothing I'd not worked out by myself.
Incidentally, I have no intention of linking it to a public phone line,
I just want to connect it to another modem. I suspect it'll work withont
any DC voltage on the line, if not, that's easy to fix.
Did anyone, though, have a cheap/homebrew device to link 2 modems
back-to-back, doing things properly with dial and ring tones, etc?
-tony
11:56 a.m.
At 10:18 PM 9/5/05 +0100, you wrote:
Ineed...
I recently won an HP82915 Modem on E-bay (my
first, and so far, only
purchase there).
Tony? E-bay?? Now I know the end of the world is coming! :-)
I was suprised to get it for the opening bid, I though
Lucky me :-)
It wasn't listed as an Integral part, only as an HP82915 Modem. I was
pretty sure that was the Integral modem, one of my manuals mentions it in
passing. When it came, I was certain. Right size board, right connector
(a DIN 41612 socket), plastic cover over the solder side, etc.
I'd have at least one other HP collector to
contend with. It is, you see,
the internal modem for the HP Integral.
Darn you! I keep a constant watch on E-bay for Integral stuff but I
didn't see it!
Anyway, it's a single PCB that fits into one of the Integral's expansion
slots. Cotnains about 20 ICs, most of which I recognise. One odd thing is
that the serial chip used is an 8250, a somewhat odd choice for a
68000-based machine.
Does anyone here know anything about using it?
Not much. It's a 300/1200 Baud modem. ONE sales brochure list it in ONE
place but give NO details or pictures and never mentions it again. The service manuals don't give ANY details about it.
(It's one of those "If it
fails, replace the CCA. If it still fails, replace the whole thing."
Repairing it would probably violate the FCC approval (it would certainly
violate BT appoval for a UK modem). Since I don't intend to connect this
to a public phone line, that doesn't bother me.
That said, the HP Portable Plus service manual (I have it) does give some
repair procedures and a scheamtic for its internal modem (totally
different ot the IPC one, BTW). I does say that certain components
(mostly resistors) must not be replaced in the field, since this could
affect the FCC approval (incorrect transmitter level, etc).
procedures.) To test it they have you install two
modems in the IPC and
plug them into separate phone lines and call one from the other while
running the diagnostics program. The diagnostics program will report No
Carrier, No Dialtone and the like but that's all. There no mention of a
null-modem type cable.
Well, there won't be any form of null modem cable. There are only 2 wires
to the telephone line, and polarity shouldn't matter. However, we had a
brief discussion here a few weeks ago about linking 2 modems without the
use of a public telephone system, e.g. by buying a small telephone
exchange. I am wondering how much is actually needed for _this_ modem.
-tony
10:05 a.m.
At 07:56 PM 9/6/05 +0100, you wrote:
it's not that interesting to look at. It looks like any other Integral
PCB. As I said, about 17 chips, a crystel, a crystal oscillator, a 3
terminal regualtro, a transformer, a reed relay, a transistor, and some
passives. 2 US-style phone sockets on the bracket, both unmarked (may
just be wired pin-pin, with the appropirate pair of pins also going to
the modem circuitry).
I'll get the SM out again and tell what errors it reports. That should
give you an idea of what signals you have to provide.
PS After I replied last time I also got out the manual for the DataComm
program. It's NO help either. The only thing interesting that I found in it
is that DataComm uses the "CPM style" block data transfer. Other names that
they give for it include XModem. Of course that's no use to you unless
you're going to run DataComm.
Joe
At 10:18 PM 9/5/05 +0100, you wrote:
Ineed...
I recently won an HP82915 Modem on E-bay (my
first, and so far, only
purchase there).
Tony? E-bay?? Now I know the end of the world is coming! :-)
I was suprised to get it for the opening bid, I though
Lucky me :-)
It wasn't listed as an Integral part, only as an HP82915 Modem. I was
pretty sure that was the Integral modem, one of my manuals mentions it in
passing. When it came, I was certain. Right size board, right connector
(a DIN 41612 socket), plastic cover over the solder side, etc.
I'd have at least one other HP collector to
contend with. It is, you see,
the internal modem for the HP Integral.
Darn you! I keep a constant watch on E-bay for Integral stuff but I
didn't see it!
Anyway, it's a single PCB that fits into one of the Integral's expansion
slots. Cotnains about 20 ICs, most of which I recognise. One odd thing is
that the serial chip used is an 8250, a somewhat odd choice for a
68000-based machine.
Does anyone here know anything about using it?
Not much. It's a 300/1200 Baud modem. ONE sales brochure list it in ONE
place but give NO details or pictures and never mentions it again. The service manuals don't give ANY details about
it. (It's one of those "If it
fails, replace the CCA. If it still fails, replace the whole thing."
Repairing it would probably violate the FCC approval (it would certainly
violate BT appoval for a UK modem). Since I don't intend to connect this
to a public phone line, that doesn't bother me.
That said, the HP Portable Plus service manual (I have it) does give some
repair procedures and a scheamtic for its internal modem (totally
different ot the IPC one, BTW). I does say that certain components
(mostly resistors) must not be replaced in the field, since this could
affect the FCC approval (incorrect transmitter level, etc).
procedures.) To test it they have you install
two modems in the IPC and
plug them into separate phone lines and call one from the other while
running the diagnostics program. The diagnostics program will report No
Carrier, No Dialtone and the like but that's all. There no mention of a
null-modem type cable.
Well, there won't be any form of null modem cable. There are only 2 wires
to the telephone line, and polarity shouldn't matter. However, we had a
brief discussion here a few weeks ago about linking 2 modems without the
use of a public telephone system, e.g. by buying a small telephone
exchange. I am wondering how much is actually needed for _this_ modem.
-tony
2:13 p.m.
I'll get the SM out again and tell what errors
it reports. That should
give you an idea of what signals you have to provide.
The modem itself is relatively unintellegent. There is no microprocessor,
for example, on the modem PCB. It appears the Integral's processor can
directly program the registers of the transmitter and receiver chips
(along, of course, with the 8250 serial chip's registers).
The point of that is that the _hardware_ is not going to require a
dialtone or anything like that. Of course what the Integral's software
requires is another matter.
I have no information at all on the modem device driver. I have no idea
what you can get it to do using the standard software.
PS After I replied last time I also got out the manual for the DataComm
program. It's NO help either. The only thing interesting that I found in it
Well, I'll need to find some program that supports it... Is there a
version of Kermit that would do that, I wonder...
is that DataComm uses the "CPM style" block
data transfer. Other names that
they give for it include XModem. Of course that's no use to you unless
IIRC, XMdoem was developed from Modem7, which was one of the CP/M file
transfer programs. Personally, I'd be happier with kermit, I have many
more machines that support it, I have the book for it, etc. But I'd
settle for XModem if nothing else is available.
you're going to run DataComm.
First problem is finding if I _have_ DataComm.
-tony
11:27 a.m.
At 10:13 PM 9/6/05 +0100, you wrote:
I'm not sure and I don't remember seeing anything about it in any of the
system manuals.
I don't think HP released one but I'll bet someone somewhere did!
Yeap, that's one of the other names that they give.
which was one of the CP/M file
I'll get
the SM out again and tell what errors it reports. That should
give you an idea of what signals you have to provide.
The modem itself is relatively unintellegent. There is no microprocessor,
for example, on the modem PCB. It appears the Integral's processor can
directly program the registers of the transmitter and receiver chips
(along, of course, with the 8250 serial chip's registers).
The point of that is that the _hardware_ is not going to require a
dialtone or anything like that. Of course what the Integral's software
requires is another matter.
I have no information at all on the modem device driver. I have no idea
what you can get it to do using the standard software.
PS After I replied last time I also got out the manual for the DataComm
program. It's NO help either. The only thing interesting that I found in it
Well, I'll need to find some program that supports it... Is there a
version of Kermit that would do that, I wonder... is that DataComm uses the "CPM style"
block data transfer. Other names that
they give for it include XModem. Of course that's no use to you unless
IIRC, XMdoem was developed from Modem7, transfer programs. Personally, I'd be happier with
kermit, I have many
more machines that support it, I have the book for it, etc. But I'd
settle for XModem if nothing else is available.
I have it and I have the manual. It's in the pile of the next stuff to go
to Al K to be scanned. There used to be a website of IPC software on the
net. I don't if it's still around but I think it is. BINGO!
<http://www.coho.org/~pete/IPC/bundled_dl.html> That took about 3 seconds
with Google. It has the Diagnostics and Utilities along with the System
files but I don't see DataComm. You might E-mail Peter and ask him if he
has it and can post it. You should also ask him about Kermit.
Joe
you're going to run DataComm.
First problem is finding if I _have_ DataComm.
-tony
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