More thoughts on building a Z-80 (64bit!!!)

From: Marvin <marvin_at_rain.org>
Date: Mon Oct 26 10:17:39 1998

William Donzelli wrote:
>
> > Exactly. And the spacing between the tracks matters a lot. And having
> > sharp corners, and ...
>
> Be careful here...when using very fast logic (10G GaAs), you do NOT want
> 90 degree sharp bends. The best bet is to truncate the corners in a
> specific way so that the edges of the pulses reflect the direction you
> want them to go, and not back at the source.

Ah yes, I found out about that when I looked at trace widths of the boards I
had contracted to build, and found that the actual trace width at each of
the corners you describe got down to the several mil area. Of course I found
this out *after* I had taken on the job. And yes, the boards came out just
fine although the reject rate was much higher than I would have preferred.
Received on Mon Oct 26 1998 - 10:17:39 GMT