On Sat, 12 Dec 1998 jeff.kaneko(a)juno.com wrote:
  ANother cool Data-20 product was the Z-80 VideoPAK.
This added a Z-80
 cpu, and an 80-column display to the C-64.  It was supposed to run
 CP/M also.  I also have one of these as well (thanks Doug!), but no
 software.  Still looking. 
Do you have the power supply for it?  I have one of these as well (I
believe we talked about it before) but my C64 won't power up when it's
plugged in, and there's a plug for a power supply in the back.  I need to
know voltage and polarity.
I got a cassette tape with the unit, and side A is supposed to be for C64
and side B for VIC-20.  I've not checked what's on it.  The cassette has
the DATA-20 logo on it, so it definitely relates to this unit.
Another interesting unit is the B.I.-80 80 Column Display cartridge from
Batteries Included.  It works well, and includes BASIC 4.0!
--
Doug Spence
ds_spenc(a)alcor.concordia.ca
http://alcor.concordia.ca/~ds_spenc/