16 Nov
2005
16 Nov
'05
12:20 a.m.
woodelf wrote:
Well that number now that I think about it is way off,
from memory
speeds in the
PDP -8 Faq. The handbook lists the pdp-8/e as 1.2 us for jump and
operate instructions.
2.6 us for memory instructions.+1.2 us for indirect.+1.4 us for
auto-indexed. A 5 mhz clock
looks to be used. I/O seem to have a variable time but 2.6us is the
general speed listed.
For the pdp-8/e, it is actually a 20MHz clock driving a 28 bit shift
register from which 4 timing states are generated. The memory cycle is
1.2us.