Red,
If I am correct, that's a Bigfoot Power Supply. I used to have one for my old A500. 250W. Those things are BOMB!!!!! That will help ya get the best out of your A500. I had an A500, with a 4MB ADRam Card, Trumpcard SCSI Controller with 80MB HHD and a 4X CDRom running off that bad boy. Gave it away to some guy in New York after I bought my first A2000. He was supposed to pay me back for shipping....now that I remember, he never did. X^(