Technical Description
LEO I's clock speed was 500 kHz, with most instructions taking about 1.5 ms to execute. To be useful for business applications, the computer had to be able to handle a number of data streams, input and output, simultaneously. Therefore, its chief designer, Dr. John Pinkerton, designed the machine to have multiple input/output buffers. In the first instance, these were linked to fast paper tape readers and punches, fast punched card readers and punches, and a 100 line a minute tabulator. Later, other devices, including magnetic tape, were added. Its ultrasonic delay line memory based on tanks of mercury, with 2K (2048) 35-bit words (i.e., 8¾ K bytes), was four times as large as that of EDSAC. The systems analysis was carried out by David Caminer.
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