If John is measuring standard hardware, that would make sense. Heck, he could read the expansion port directly and save a lot of trouble.
I suspect he's doing it this way since all emulators can at least beep. --b9 On November 13, 2026 7:03:34 PM PST, "[email protected]" <[email protected]> wrote: >Why not just use the cassette port and the SID/SOD and leave the PIO out of >the picture? > >On November 13, 2026 10:14:04 PM UTC, "John R. Hogerhuis" <[email protected]> >wrote: >>The idea is a small program that sets up I/O registers and turns off >>interrupts so CPU clock -> PIO -> beeper. Make a recording and do analysis. >>With a local AI doing the grunt work so it should be easier than it >>"sounds." >> >>-- John. >> >>On Fri, Nov 13, 2026 at 8:04 AM B9 <[email protected]> wrote: >> >>> I'd be curious to see how you are estimating the clock speed. Just a >>> simple machine language loop? >>> >>> It would be interesting to see how emulators compare and to test them >>> against both the M100's internal sense of time and objective "wall time". >>> >>> For example, I expect MAME will have the best match to the internal clock >>> and worst match to actual time. >>> >>> Virtual T seems to have a reasonable clock for the M100, but it is >>> slightly off for the T200. I'm not sure how Virtual T's clock works. It >>> seems to magically sync with the host computer's time, but does that only >>> happen at start-up or is it replacing the M100's time-of-day clock >>> completely? >>> >>> --b9 >>> >>> >>> On November 12, 2026 12:31:53 PM PST, "John R. Hogerhuis" < >>> [email protected]> wrote: >>> >>>> >>>> >>>> On Thu, Nov 12, 2026 at 11:45 AM Daniel L <[email protected]> wrote: >>>> >>>>> >>>>>> How did it turn out? >>>>> >>>>> daniel >>>>> sysop | air & wave bbs >>>>> finger | [email protected] >>>>> >>>> >>>> Thanks for asking Daniel. Still working on it... went on a sidequest of >>>> fixing several little emulator bugs and creating more software tools. I had >>>> no idea the "undocumented instructions" were finally completely reverse >>>> engineered with a microscope (Shirriff)! Simplifications, little details >>>> with undocumented flag behavior that the giants didn't figure out in 1979, >>>> and whatnot. >>>> >>>> Anyway, almost back to the clock stuff. >>>> >>>> -- John. >>>> >>> > >-- Sent from /e/OS Mail.
