vtl@stolaf.UUCP (Victor Lee) (02/15/84)
*Real Reverse Video on H29 Terminals*
H29 owners, try lifting pin 13 of IC U430 on your terminal logic
board (purists can pull it up to +5v thru a 2.2K ohm resistor).
Voila, instant reverse video (black letters on a green screen).
If anyone is crazy enough to do this, let me know how you like it.
I found that this cuts the glare off the screen when my office is
brightly lit and that the black chars are easier to read from a
distance.
In case you're worried about your chips, you're letting the input to
a 74S86 (quad 2-input exclusive-or) float high. This feeds a constant
reverse video signal to the rest of the video logic. An unfortunate
side affect is you have also cut off the reverse video output of the
CRT controller chip (thus no "reverse-reverse-video"). One solution
is to tell your termcap to do reverse video in half-intensity (which
looks nicer anyway).
Victor Lee -- St. Olaf College, Northfield MN -- {ihnp4,decvax}!stolaf!vtl