20 Oct
2004
20 Oct
'04
11:46 a.m.
Hi Ethan,
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).
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.
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. -
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,
etc.)
Again, check funet for anything related to the 8010. 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):
http://www.commodore.ca/gallery/hardware/pet_acc_coupler1.JPG
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.
Regards,
Dave
--
dave04a (at) Dave Dunfield
dunfield (dot) Firmware development services & tools: www.dunfield.com
com Vintage computing equipment collector.
http://www.parse.com/~ddunfield/museum/index.html
20 Oct
20 Oct
12:23 p.m.
On Wed, Oct 20, 2004 at 07:46:27PM -0400, Dave Dunfield wrote:
Cool.
Hi Ethan,
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.
OK... the 6402 UART is one of the ones that I think can be interfaced
to simple logic - i.e., it doesn't _require_ a microprocessor to read
or write to it. I think there's one in an IEEE-serial box I have from
TNW. I know there's no uP in there.
As for the 40-pin chip, unless it's something like a 6500/1 (a micro-
controller-like relative of the 6502, as found in the 1520 plotter),
you might try looking at the 24 and 28 pin chips for a 6504 or
something like it... It's a 6502 with a short address bus. C= used
them in various disk and printer products. Same die AFAIK, but a
smaller package cuts mfg costs if you don't need 16-bit addressing.
I have no knowledge of 8010 internals, but I have been around a few
printers and a lot of disk devices.
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...
Hmm... that makes it hard.
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).
Sure... that's always easiest.
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.
That's unfortunate but not surprising... it's not a common thing. If
I had one, I'm not even sure I could find a use for it. I'm happy to
have a third-party IEEE-serial adapter, and a fits-in-a-ROM-socket 6551
board as well. I did a lot of user-port interfacing as a kid (dual 7-
segment LED display, external keyboard, "Simon" from a 1978 Byte article,
etc...), but never played with serial comms. I _did_ do a bunch with
my C-64, once I got one.
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):
http://www.commodore.ca/gallery/hardware/pet_acc_coupler1.JPG I got it quite by accident - I talked my wife into a
2-hour detour on our
Thanksgiving getaway...
Nice find.
-ethan
--
Ethan Dicks, A-130-S Current South Pole Weather at 21-Oct-2004 00:10 Z
South Pole Station
PSC 468 Box 400 Temp -68.2 F (-55.7 C) Windchill -92 F (-68.90 C)
APO AP 96598 Wind 4.7 kts Grid 100 Barometer 676.5 mb (10760 ft)
Ethan.Dicks(a)amanda.spole.gov http://penguincentral.com/penguincentral.html
1:38 p.m.
On Wed, Oct 20, 2004 at 07:46:27PM -0400, Dave Dunfield wrote:
Correct. It's got separate transmit and receive (parallel) data pins,
baud rate clock inputs, word lenght/parity/stop bit configuration pins,
and so on. It's quite easy to connect to random logic.
Hi Ethan,
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.
OK... the 6402 UART is one of the ones that I think can be interfaced
to simple logic - i.e., it doesn't _require_ a microprocessor to read or write to it. I think there's one in an
IEEE-serial box I have from
TNW. I know there's no uP in there.
There was a relatively common PET->RS232 interface in the UK called the
B200. It contained a 6402-like UART, a baud rate generator ckip, a couple
of 2708s (one as a PETSCII<->ASCII converter and address decoder, the
other as the handshake state machine logic) and not a lot else. I
hesitate to called it an IEEE488-> RS232 interface, since the handshake
timing was way off, and while it works with PETs, it fails to work with
many other IEEE488 controllers.
As for the 40-pin chip, unless it's something like a 6500/1 (a micro-
controller-like relative of the 6502, as found in the 1520 plotter),
Unless there's some EPROM/ROM in there, it's unlikely to be a
microprocessor. It might even be a gate array.
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...
Hmm... that makes it hard.
7369
days inactive
7369
days old
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ard＠p850ug1.demon.co.uk -
dave04a＠dunfield.com -
dickset＠amanda.spole.gov