On Mon, 26 Oct 1998, Stephen Judd wrote: > This last part is very stupid. Of course it switches VIC banks, as the > two bitmaps are in two separate banks. What I meant is that the bitmaps > are in banks 1 and 2, and I see no way for $DD00 to accidentally point > to bank 0 or 3 for a single frame. My thinking is that the garbage might > be $3FFF or some such. How wide is the garbage? Only 8 pixels? If yes, then it could be that the $DD00 output lines on the CIA do not change exactly simultaneously (1->2 could become 1->3->2 or 1->0->2), or they change while the video chip is reading the data, changing the A14 and A15 during an "address valid" phase. I haven't experimented with this; I've always switched video banks somewhere in the screen border. Marko - This message was sent through the cbm-hackers mailing list. To unsubscribe: echo unsubscribe | mail email@example.com.
Archive generated by hypermail 2.1.1.