Hello! I am writing the software for my MultiKernal Flash device for C64. I found that during writing to the Flash chip I need to disable chip reads, because otherwise they mess up with magic write sequences. But then VIC-II cannot read character ROM, which results in garbled screen display. Therefore I would like to write to the Flash chip only when character ROM is not needed - i.e. when the lower or upper border is drawn. For this, I need to consult the $D012 register. However, I have only a PAL machine and I don't know how the values look like on a NTSC machine. I would assume that they both start at 0 and the border starts/ends at the same positions as with PAL, only possibly the total number of lines is different - is that a correct assumption? Regards, Michau. Message was sent through the cbm-hackers mailing listReceived on 2013-06-18 17:00:58
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