External 3B1 monitor project status
thad at btr.btr.com
thad at btr.btr.com
Mon Mar 11 15:24:18 AEST 1991
staffan at phos.serum.kodak.com (Kenneth Staffan (x37507))
in <1991Mar8.162643.11785 at ssd.kodak.com> writes:
Has anyone tried disconnecting the monitor from a 3b1 box in order to
use it on a monitor pedestal? (or for any other reason, actually.)
How'd it work?
and
Mariusz at fbits.ttank.com (Mariusz Stanczak) in <89 at fbits.ttank.com> writes:
BTW, Thad, if you're reading this, have you managed to work
out the details in your outboard-white-big-monitor project?
I'm very interested in doing the same (stuffing a motherboard
into a separate box)... especially now... this "air blower" is
ready for take-off.
As of several weeks ago, with the addition of an inverter for the vert sync
signal, the external "Hercules compatible" monitor is more-or-less working.
The only remaining problem yet-unsolved concerns "missing" pixels at the left
hand margin. For example, rather than seeing, say, "ksh> ", I get ":sh> ";
that is, only the ends of the arms of the "k" are shown; same problem with
the missing left sides of UA menu windows.
Attempts to insert numerous inverters in the video-signal line in the hopes
of delaying the video after the horizontal sync haven't produced any noticeable
improvement. One person is bringing over a delay line and we still need to
try that out; luckily the delay line is in a 16-pin DIP package and provides
"taps" at a number of delays up to and including 100nS.
More details as they become available ...
Someone else was proposing a complete re-vamp of the 3B1 video to use one
of the TI 32010 (34010?) or 32020 (34020?) programmable video chips for
everything; as exciting as this sounds, I don't have the time required to
commit to a project of that magnitude.
Thad Floryan [ thad at btr.com (OR) {decwrl, mips, fernwood}!btr!thad ]
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