| General: |
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Parallel operation. |
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Binary notation internally. |
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Control by stored program. |
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| Word size: |
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Either 36 bits or 18 bits, including sign; approximately equivalent to 10 or
5 decimal digits and sign. |
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Accumulator has two extra bits for overflow. |
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| Instructions: |
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Single-address system. |
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33 distinct operations. |
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Instructions are 18-bit words. |
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| Computing speed: |
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Multiplication or Division: 0.456 millisecond. |
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Addition or Subtraction: 0.060 millisecond. |
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| Electrostatic storage: |
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Capacity - 2048 words of 36 bits each. |
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Each full-word location may store a pair of 18-bit words. |
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72 tubes, 1024 bits per tube. |
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| Magnetic drums: |
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Four drums, each with a capacity of 2048 words of 36 bits each, in basic system. |
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Average access time to first word of block - 40 milliseconds. |
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Reading or writing rate - 800 words per second. |
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| Magnetic tapes: |
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Four magnetic tape units in basic system. |
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Material: Oxide-coated plastic tape, 1/2 inch wide. |
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Recording in 7 parallel channels, 6 for information and 1 for redundancy checking. |
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Tape may be written forward, read forward, or read backward under program control. |
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Density within a unit record: 200 words per foot. |
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Distance between unit records - 1 inch. |
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Maximum tape length on reel - 1400 ft. |
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Access time to start of unit record - approx. 10 milliseconds. |
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Reading or writing rate within unit record 1250 words per second. |
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| Page printer: |
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Rate - 150 lines per minute. |
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Prints numeric, alphabetic, and special characters. |
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Prints at full speed in decimal form using simultaneous conversion program. |
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Prints 72 characters in any of 120 character positions on one line, more at reduced speed. |
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Automatic line spacing or skipping, under control of stored program. |
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| Card reader and card punch: |
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Reads or punches any 72 of the 80 card columns. |
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Reading rate - 150 cards per minute. |
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Punching rate - 100 cards per minute. |
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Reads or punches cards in standard IBM decimal code at full speed using simultaneous conversion program. |
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Reads or punches cards in binary form at full speed with 24 words of 36 bits each to a card. |
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