These machines were variable word length commercial machines, as were many of the computers for which an Autocoder was released.
2.
Rather, it is a flag bit used to mark the end of a word on some variable word length computers such as the IBM 1401.
3.
Being variable word length decimal, as opposed to fixed-word-length pure binary, made it an especially attractive first computer to learn on and hundreds of thousands of students had their first experiences with a computer on the IBM 1620.
4.
Arbitrary-precision arithmetic is considerably slower than arithmetic using numbers that fit entirely within processor registers, since the latter are usually implemented in variable word length " machines of the 1950s and 1960s, notably the IBM 1620, IBM 1401 and the Honeywell " Liberator " series, could manipulate numbers bound only by available storage, with an extra bit that delimited the value.
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