Commodore 8010 IEEE-488 Acoustic Modem ?

From: Dave Dunfield <>
Date: Wed Oct 20 18:46:27 2004

Hi Ethan,

>> I was recently given a Commmodore MODEM Model 8010 - this is
>> I am looking for:
>> - Information on the power supply - I did not get a power supply
>> with the modem - it has a 5-pin DIN type connector. Can anyone
>> give me the pinout and power requirements?
>Can't help there, but worst case, it shouldn't be difficult to
>reverse-engineer the power supply... if there is some kind of
>regulator, it might take a wide range of voltages. If not, then
>one of the pins is probably +5V. It's old enough that I wouldn't
>assume it uses a C-64 supply or even the voltages for the C-64
>(+5VDC, 9VAC), but it's worth looking at.

It's got a regulator, and some logic - a 6402 UART, and another
completely unmarked 40-pin chip - I'm guessing it's an PET-IEEE
controller of some sort.

Other apparent power sources from the connector head off into a maze
of op-amps and other analog circuitry, even with schematics it would
take a bit of work to figure out what supplies it was designed for...
I'm hopeing that I can find someone with this modem that can measure
the pins on the "wall wart" - at least then I have a starting point,
knowing the approximage no-load supply voltages. (It is a wall-wart,
I found a picture which shows the power-supply).

>> - Documentation? Anyone have a scan of the manual?
>Not me; sorry. Perhaps on funet?
>> - Information on how it is used ... What sort of IEEE device does it
>> show up as? Is there "special software" that is used with it? etc.?
>Worst case, you could write a quick BASIC program to try OPENing all the
>devices from 4 to 31 and see where it responds (once you get the power
>issue resolved). Without docs, it'll be hard to tell if there are any
>significant secondary addresses, though.
>As for special software, there should be at least a simple term program
>for it. It's possible to write one in BASIC - I did for the C-64 (with
>a VIC-MODEM). You'll have to do ASCII<->PETSCII conversion if you want
>to talk to a host expecting a VT100 or something similar. I used to
>use my simple term prog to talk to BBSes and CompuServe, c. 1982. It
>did everything I needed except download files (which wasn't how I was
>using the modem back in those days - I did mail, chat, online games,
>Again, check funet for anything related to the 8010.

Didn't find a thing on funet - I do have a local PET software expert who
can probably figure some of it out, but again, if I can find hard docs
or software it would save some head-scratching... Google didn't turn up
much except for a couple of pictures.

>Nice find. I've never seen one. Good luck on the hunt for docs.

Thanks, I did find a few references to it, and here is a fairly decent
picture (shows front-on view as well as both ends):

Next time I update my site I will include my own pics, but I just updated
so that will be a little while.

I got it quite by accident - I talked my wife into a 2-hour detour on our
Thanksgiving getaway (would have been a 10-hour drive later) to pick up a
"small load" of equipment that had been promised to me - I also warned her
to "pack light" -- ha..ha.. I completely filled the back of my Jeep from
floor to ceiling (which we ended up hauling around all weekend). After I had
everything packed, the guy started digging out little bits of stuff from his
garage, which I kept stuffing into nooks and crannies, near the end he
offered me this acoustic coupler, and it was only because it said "Commodore"
on it that I decided to find room for it (by then it was getting pretty hard
to find ANY space) - it wasn't until several days after unpacking and going
through the stuff that I looked at it closely, and realized that it had the
PET-IEEE interface.

dave04a (at)    Dave Dunfield
dunfield (dot)  Firmware development services & tools:
com             Vintage computing equipment collector.
Received on Wed Oct 20 2004 - 18:46:27 BST

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