3 Oct
2019
3 Oct
'19
5:15 p.m.
Noel wrote:
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".
http://www.bitsavers.org/www.computer.museum.uq.edu.au/pdf/DEC-10-HMAA-D%20…
p 1-1 (pdf pg 13) says the CPU options were:
KE10 Extended Order Code (byte instructions)
KT10 Memory Protection and Relocation
KT10A Double Memory Protection and Relocation
KM10 Fast Registers
Elsewhere I have the note the the fast registers had 0.21 microsecond
access time.