Commodore 8010 IEEE-488 Acoustic Modem ? - test-drb@ccmp.vtda.org

20 Oct 2004

Hi Ethan,

...
 > 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. 
Thats my plan-B - but I'm hopeing someone has this modem and can
at least measure the supplies - Sometimes older analog stuff uses
"funny" voltages and it might not be obvious what the supplies are
supposed to be - agreed that it should be easy to identify 5V for the
logic - it appears to be "completely manual" with switches for Answer-
Off-Originate, so I don't think there's much logic except for the IEEE
interface.

...
   -
Documentation? Anyone have a scan of the manual? Not me; sorry.  Perhaps on funet?

Didn't find anything on funet - but I will continue to look. Not much
mention of this device at all that I could find via google.

...
   - 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. 
Yeah - not that I have a burning desire to communiate at 300bps, but I
like to get everything that I collect working ... I did find a couple of
references to software for this modem, which I am trying to track down.
I've never used an IEEE modem on a PET, so it might be "interesting" to
try and figure it out on my own...

...
 Nice find.  I've never seen one.  Good luck on the
hunt for docs. 
Here's a picture I found ... I will be adding my own pics to my site on the
next update (but I just updated it so it will be a while):

  http://www.commodore.ca/gallery/hardware/pet_acc_coupler1.JPG

Regards,
Dave

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