> On 2021-09-01, at 19:06, Michiel Boland <michiel_at_boland.org> wrote: > >>>> i *think* what silverdr is looking for isnt actually "whole visible screen" but really "the entire screen" (the complete area that contains video output) to make some measurements - not sure what dimensions you'd have to use for this >>> >>> 25 years ago, Marko Mäkelä et. al did some measurements as documented in this document: >>> >>> http://www.zimmers.net/anonftp/pub/cbm/documents/chipdata/VIC-I.txt >>> >>> I'm sure P will be able to adjust the POKE coordinates to match his requirements. >> Pardon my VC-20 ignorance.. I take this means that VIC-I can expand its "screen" area to cover the *entire* "border" area, ritht? > > I did some experimenting - on a PAL VC-20 the bottom two raster lines (i.e. the last two lines before the equalization pulses start) are always set to the background color, regardless of values you put in $9001 or $9003. The one exception is if you set $9001 to zero, then the bottom line contains garbage, but the second line from the bottom is still background only. So vertically we don't seem to be able to cover the entire screen it seems but horizontally (except the last one/two rasterlines) that's no problem I take. Shall try to adapt the POKEs from Anders and see where I get with them. BTW - does `xvic` emulate the "interlaced" mode of NTSC VC-20? -- SD!Received on 2021-09-01 20:00:42
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