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| Storage capacity of magnetic drum |
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10,000 or 20,000 digits (1,000 or 2,000 words) |
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| Input units |
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IBM 533 Read-Punch Unit |
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IBM 407 Accounting Machine |
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IBM 727 Magnetic Tape Unit |
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| Output units |
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IBM 533 Read-Punch Unit |
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IBM 407 Accounting Machine (with Summary Punch) |
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IBM 727 Magnetic Tape Unit |
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| Input-Output storage areas |
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Independent storage areas are provided for simultaneous input and output operations |
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| Approximate calculating speeds (optimally programmed) |
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78,000 additions or subtractions per minute |
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5,000 multiplications per minute (multiplier = 5,555,555,555) |
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3,700 divisions per minute (divisor = 5,555,555,555) |
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138,000 logical decisions per minute |
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| Operating features |
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Automatic internal checking |
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Single instruction table look-up |
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Console control of machine |
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Average access time to data on drum 2.4 milliseconds |
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Control panel flexibility |
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| Primary components |
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IBM 650 Console Unit |
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IBM 655 Power Unit |
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| Plus any of the following combinations: |
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| Punched card input-output |
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1 to 3 IBM 533 Read-Punch Units |
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| Punched card input, line printed output |
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1 to 3 IBM 407 Accounting Machines |
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A Summary Punch can be used with each 407 to obtain punched card output |
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| Punched card input-output, line printed output |
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Any combination of 533s and 407s up to a total of 3 units |
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A Summary Punch can be used with each 407 |
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| High-Speed magnetic core storage |
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IBM 653 Auxiliary Unit added to any preceding combination |
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| Magnetic tape input-output |
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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 |
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