General information
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
General information
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
650 Combinations
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