Posted By
IstvanV
on 2007-11-11
07:54:12
|  Re: Drean Commodore 16 details -- finally...
Regarding emulation, the slightly higher clock frequency is of course an easy change (with plus4emu 1.2.3, just set the video clock frequency to 17910275 - since it is still divided by 20, it should be OK as long as programs do not mess with the NTSC bit in $FF07), but the NTSC bit is more tricky, at least for me, since there are many code parts that assume the standard 8360 behavior; in the end, it is solvable, but I do not know how to avoid a minor slowdown.
The pictures look interesting. While it cannot be seen if the interlace works with colors, I would assume that it does. Of course, another simple demo, that also uses NTSC to increase the horizontal resolution as well, would not work at all.
I have some simple TED test programs that I use to compare emulation with the real machine, but other than the different clock division and color subcarrier, it is probably not different from the other PAL machines.
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