"John R. Hogerhuis" <[email protected]> writes: > Can anyone explain to me "cycles" versus "states" in regard to the 8085 > and the model 100? > Should I be able to translate clock speed and instruction cycles > directly to time? > How accurate are the rtc and cpu crystals in the M100? > Are there waits when accessing RAM that might change timing? > I am doing some analysis with timing loops and it seems to indicate the > cpu is actually running at 2.3235mhz. But nominal‚ is 2.4576mhz right > (after /2)? > -- John.
instruct timing is measured in T-states right? each equals a CPU clock period. You should be able to calculate execution time directly at 2.4576. Though the m100 generates interrupts at 256Hz for housekeeping, it might account for the apparent slowdown. Could you try running the timing loop with interrupts temporarily disabled? Maaybe youd see the expected clock speed. -- Daniel sysop | air & wave bbs finger | [email protected]
