15 Nov
2005
15 Nov
'05
12:16 a.m.
On 11/14/2005 at 5:57 PM Jim Battle wrote:
Time to add some commentary to the wiki, methinks.
IIRC, the cycle time of the original straight 8 was 1.5 usec. Instruction
times in cycles is given here:
http://www.cs.uiowa.edu/~jones/pdp8/refcard/65.html
"The PDP-8
was a 12-bit computer with 4096 words of memory. It had only
eight
instructions, one full register, the accumulator (AC), and a single-bit
register, the link (L) bit. The machine operated at a clock rate of 1 MHz,
and
took 10 clocks for each instruction, so that it ran at 0.1MIPS."