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