Gateway PSU question PERFORMANCE 1600 CL

[btcomm1]

I have an old gateway PERFORMANCE 1600 CL and I was wondering if anyone knew or knows how to find out if this computer takes a standard power supply, it looks like it has standard ATX connector, a standard 4 pin mobo connector and then it has 1 AT power connector that connects to it but before I try a standard PSU I want to be sure it takes a standardly wired PSU before I do damage to a PSU or the motherboard.