3 Oct
2019
3 Oct
'19
9:01 a.m.
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".
Noel