[TELECOM Digest Editor's Note: One of my earliest terminal monitors
> was the H-19 from Heathkit (also known as Z-19 if you bought it
> already put together from Zenith. There as a little switch on the
> back which allowed you to 'default into' 50/60 cps, and you could also
> switch between 50/60 cps mode using keystrokes. PAT]
I have a couple of H-89/90 CP/M systems stashed away in a cupboard. If I recall correctly, the terminal section within these is identical to the H/Z-19.