On Sat, 27 Sep 1997, Jonathan Stone wrote:

> 
> In message <199709230155.LAA28985@balrog.supp.cpr.itg.telecom.com.au>Simon Burg
> e writes
> >On Mon, 22 Sep 1997 17:20:34 -0700  Phil Tait wrote:
> >
> >> I see that "jonathon" fixed the character-doubling on OUTPUT problem by
> >> adding DELAY(2) after SCC_WRITE DATA() back in 1995 (see excerpt from
> >> source-changes at end of note).
> >> 
> >> I'm seeing a character-doubling problem on INPUT (reading an instrument
> >> at 1200baud).  I'm looking for informed opinions as to whether it's
> >> appropriate to assume symmetry, and add DELAY(2) after SCC_READ_DATA();
> >> or maybe someone has a better idea for a fix.
> 
> 
> the data book i used mentioned a problem on the output side; i didn't
> see anything about a similar settle time required on the input side.
> But the book was for an Intel second-sourced part, not a Zilog chip.

>From the Zilog docs I've seen, EVERY access needs the delay. Mac II and
later Macs have the delay built into hardware. Sun3 hardware needs it done
in software.

Take care,

Bill