oml%lanl@sri-unix.UUCP (04/27/84)
From: Olaf Lubeck C-3 <oml@lanl>
I've been working with the pc-jr's graphics and need to change color
registers at a particular scan line. I know that there is no
capability to interrupt at horizontal retrace but I can use the timer
interrupt to interrupt just before the retrace period. If I could
then poll the horizontal retrace active bit, I would be able to change
color registers during that time. Only problem is I can't find
documentation to tell me if there is such a thing as a horizontal
retrace active bit. Anyone know ... or have other ideas? I know the
pc had this bit.
Olaf Lubeck Home 505-662-3471
work 505-667-6017