Re: VC-20 all 16 colours full-screen?

From: Anders Carlsson <anders.carlsson_at_sfks.se>
Date: Thu, 2 Sep 2021 09:49:47 +0200
Message-ID: <da9b99ff-1db2-e66b-2efb-eac908482a42_at_sfks.se>
silverdr wrote:

 > When I run it on `xvic` I still get one "column" worth of border 
colour on both left and right.

I just tested on a real PAL VIC-20. With POKE 36864,0 and POKE 36866,31 
(+128 depending on the location of the screen matrix) you eliminate the 
border so you can adapt Michiel's program with these changes. Combined 
with POKE 36865,0 and POKE 36867,39 (or even 41 if you really must 
ensure that the entire screen is covered), it should be possible to 
cover the ENTIRE screen area. Since you're not putting any text or 
graphics on the screen, we can ignore the fact that quite a bit of the 
screen will fall outside of visible area on pretty much every monitor 
you can find.

Sure perhaps you can capture the video signal with some device that 
still picks up border, but since we set VIC-I to begin the screen at the 
absolute lowest X and Y coordinates and expanded the screen the maximum 
number of columns and rows (with 8x16 mode), if it still displays border 
colour at any place, there is nothing we can do about it from software.

Best regards
Anders Carlsson
Received on 2021-09-02 10:00:05

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