On Thu, Aug 25, 2011 at 09:32:50PM +0200, Segher Boessenkool wrote: >>In the NTSC VIC-I, there is a bit for enabling interlace mode. It does >>not work in the PAL VIC-I. I wrote a test program for it: look for >>interlace.prg and interlace.tar.gz at >>http://zimmers.net/anonftp/pub/cbm/vic20/programming/. > >We have a 6561 as well... Let's see, reg 00 bit 7... It's wired up, >goes to the Y decoder, and the one output from there is wired up as >well. I don't have further details, I haven't fully reversed this chip >(yet). I guess the interlace doesn't work as intended, but it's still >there? I don't remember if the bit remembers its contents, but it definitely causes no visible effect in the 6561. The picture is never interlaced. If I remember correctly, my demo program would switch the display to an interlaced 8x16 font on the 6560. Marko Message was sent through the cbm-hackers mailing listReceived on 2011-08-26 10:00:04
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