Posted By
TLC
on 2010-12-16
15:34:26
|  Re: Vertical splitting
MMS: it "depends" (ie. on what you call "trouble").
It has twice the number of badlines (2 per character row, instead of 1).
Some effects (that you'd base on some wiggling around badlines) don't work on Plus/4, due to small differences. Ie. delaying badlines will "move" the screen of the C64 (because the counters that address the screen memory will be affected by the number of skipped character positions); on Plus/4, the rules are slightly different, so this trick won't work.
From the other hand, the badline logics of the TED is slightly more flexible than that of the VIC (simply put, there are more registers to be interfering with  ). Also, the two badlines have own badline conditions, respectively. Those give slightly more possibilities.
One important factor, there's no "FLI bug" on the TED, which affects all forced DMA effects (FLI et. al) on the C64.
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