Greg Earle wrote

Snip.....
> Now, under 1.4.1, that's no longer true.  I was finding that if I had to
> power-cycle the Mac, or even just reset it via the Control-Command-Power
> 3-fingered salute, upon coming up, if I ran ZTerm I'd find my SPARCstation
> dropped to the "ok " PROM prompt.  That was bad enough, but in addition a
> "go" did not resume - it yielded a "hex #80 address error" or somesuch weird
> diagnostic and I'd have to reboot.  Needless to say, this was rather alarming.
Snip.....

Have you tried a 'go continue'?
I think this is the correct way to bring it back up, I vaguely remember
'go' did something different without the continue.

Sorry I can't answer your real question of why it now happens or how to
fix the dtr problem.

Regards,
Martin