ASC-15 For Titan III
The Titan III was a space launch vehicle based on the Titan II ICBM. The ASC-15 was kept as the vehicle guidance computer, but the drum was lengthened slightly to provide 78 usable tracks, an increase of 20 over the drum used in the Titan II. The memory held 9,792 instructions (51 tracks) and 1,152 constants (18 tracks). The speed was the same as for the Titan II: 100 revolutions/second × 64 words/revolution × 27 bits/word = 172.8 kilobits/second. The time for an addition operation was 156 µs; for a multiplication, 1,875 µs; and for a division, 7,968 µs.
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