650 Feeds and speeds

Storage capacity of magnetic drum

10,000 or 20,000 digits (1,000 or 2,000 words)

Input units

IBM 533 Read-Punch Unit
IBM 407 Accounting Machine
IBM 727 Magnetic Tape Unit

Output units

IBM 533 Read-Punch Unit
IBM 407 Accounting Machine (with Summary Punch)
IBM 727 Magnetic Tape Unit

Input-Output storage areas

Independent storage areas are provided for simultaneous input and output operations

Approximate calculating speeds (optimally programmed)

78,000 additions or subtractions per minute
5,000 multiplications per minute (multiplier = 5,555,555,555)
3,700 divisions per minute (divisor = 5,555,555,555)
138,000 logical decisions per minute

Operating features

Automatic internal checking
Single instruction table look-up
Console control of machine
Average access time to data on drum 2.4 milliseconds
Control panel flexibility

Primary components

IBM 650 Console Unit
IBM 655 Power Unit

Plus any of the following combinations:

Punched card input-output

1 to 3 IBM 533 Read-Punch Units

Punched card input, line printed output

1 to 3 IBM 407 Accounting Machines
A Summary Punch can be used with each 407 to obtain punched card output

Punched card input-output, line printed output

Any combination of 533s and 407s up to a total of 3 units
A Summary Punch can be used with each 407

High-Speed magnetic core storage

IBM 653 Auxiliary Unit added to any preceding combination

Magnetic tape input-output

1 to 6 IBM 727 Magnetic Tape Units added to any preceding combination. Tape system includes the 653 as a standard component, as well as the IBM 652 Control Unit