If I recall, the two prong VIC-20 power supply is simply a 9VAC 1A power supply. You can get or fabricate a replacement from Radio Shack parts. If you are replacing an existing dead P/S, you have the connector(s) you need to connect to a 9VAC transformer. If not, the connector is similar to the old AC power cables which were used on the '80s portable cassette players/radios or Remington electric razors. I'm open for any disputes. (Be gentle) Jeff Salzman