Here is a working example of the power supply Dell used in many of their mid-1990s desktop PCs. I removed this from a working Dell Optiplex 560L with a broken case.
This is an early ATX power supply with a standard 20-pin block connecting to the motherboard. The other four cables coming out of the power supply are for drives: one cable has only a small four-pin floppy connector, another has only a single 4-pin Molex connector, and the other two have two Molex connectors each.
Buyer will receive the exact item pictured here with a 30 day return privilege and free USPS Ground shipping to any U.S. zip code. I do NOT include an AC power cord.