On Thu, Jun 22, 2017 at 08:25:03AM +0200, Gerrit Heitsch wrote: > On 06/21/2017 09:02 PM, Segher Boessenkool wrote: > >On Wed, Jun 21, 2017 at 08:51:34PM +0200, Gerrit Heitsch wrote: > >>>>>What about HMOS and NTSC? 8565 is only PAL, right? What's been used on > >>>>>narrow NTSC boards? Or weren't there actually any? > >>>> > >>>>That would have been the 8562 for the C64 and the 8564 for the C128. > >>> > >>>Admittedly never seen any of the two. Can those also be distinguished > >>>from > >>>their NMOS counterparts with the collision based detection? > >> > >>No idea, the code I found spoke about PAL... But I would assume that > >>those parts of the circuit would be the same between PAL and NTSC. > > > >The only difference between PAL and NTSC should be the contents of the > >X and Y comparator arrays. I've never seen a die pic of any NTSC VIC-II, > >so no idea if that is actually true... But I cannot think of any other > >difference currently. > > Well, the color generator should be a bit different since PAL and NTSC > differ in that respect. The overall differences are small enough that > you can make a chip that is switchable between PAL and NTSC as the 8360 > TED proves. Right, the PAL version switches colour phase on odd/even lines. There are metal contacts for that (exactly like in the big timing arrays; also for changing a chip from 8-bit addressed dram to 7-bit). Same silicon, except for the metal contacts mask. Segher Message was sent through the cbm-hackers mailing listReceived on 2017-06-22 16:00:01
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