4 ms·
Dunno about the pdp-1, but the pdp-10 series machines allowed the registers to be addressed like memory, if I recall correctly- the registers were special and f
by ngvrnd 4y ago
Dunno about the pdp-1, but the pdp-10 series machines allowed the registers to be addressed like memory, if I recall correctly- the registers were special and faster than the rest of memory, but one could put machine code in them and run it there. I guess using registers would have been tricky in that case though.
- aap_ 4y agoThe pdp-1 has two architectural registers: AC and IO and they're not addressable as memory. The PDP-10 has a similar internal structure but fetches and stores the accumulator from/to memory* for instructions that use it. * in the PDP-6 it really is external memory, in the later models (aka PDP-10) it was moved into the CPU