LISP implementations on small machines
jnc at mercury.lcs.mit.edu
Thu Oct 3 11:01:39 CDT 2019
> From: Paul Koning
> Some early machines, the PDP-6 I believe is an example, have
> "registers" in the ISA but they actually correspond to specific parts
> of main memory.
The PDP-6 and KA10 (basically a re-implementation of the PDP-6 architecture)
both had cheapo versions where addresses 0-15 were in main memory, but also
had an option for real registers, e.g. in the PDP-6: "The Type 162 Fast
Memory Module contains 16 words with a 0.4 usecond cycle." The KA10 has
a similar "fast memory option".
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