IBM 650The IBM 650 was IBM's first commercial business computer, a 2-address, bi-quinary coded decimal computer, with memory on a rotating drum, introduced in 1954. It was specifically designed for users of existing IBM unit record equipment upgrading from Calculating Punches (e.g., IBM 604) to computers.
The 650 system consisted of three cabinets:
- Console Unit
- Power Unit
- Card Reader/Punch Unit (Type 533)