Would a frequency counter attached to a short pickup coil, or even a shortwave receiver do the trick? I doubt the 80c85 processor has shielding unlike modern chips.
On Sat, Nov 14, 2026, 7:59 PM John R. Hogerhuis <[email protected]> wrote: > > > On Sat, Nov 14, 2026 at 3:43 PM B 9 <[email protected]> wrote: > >> I just did that and got f = 2.45841MHz. >> > > So how relevant is that deviation for keeping time? > > ISTR Ron Wiesen mentioning that he would tune the value with pencil lead, > or some such. > > -- John. >
