I know from distant memory what these names mean: the first is a saved copy of the compiler preserved just as we were abandoning the PDP-11/20, which did not have multiply or divide instructions, but instead a separate, optional unit that did these operations (and also shifts) by storing the operands into memory locations. Two tapes are present here the first is labeled "last1120c", the second "prestruct-c". But at the same time it does capture two moments in a period of creativeness and may have some historical interest. In looking over this material, I have mixed emotions so much of this stuff is immature and not well-done, and there is an element of embarrassment about displaying it. It was also the period in which Unix was rewritten in C. " As described in the C History paper, 1972-73 were the truly formative years in the development of the C language: this is when the transition from typeless B to weakly typed C took place, mediated by the (Neanderthal?) NB language, of which no source seems to survive. Unfortunately existing tapes lack interesting things like earliest Unix OS source, but some indicative fossils have been prepared for exhibition. Dennis Ritchie, the creator of the C programming language and co-creator of UNIX operating system, had been curating some old DECtapes, and he offered some of the artifacts.
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