This page (revision-5) was last changed on 03-Feb-2023 15:21 by Florian Dingler 

This page was created on 21-Mar-2017 08:03 by Florian Dingler

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Version Date Modified Size Author Changes ... Change note
5 03-Feb-2023 15:21 1 KB Florian Dingler to previous
4 08-Dec-2018 17:53 1 KB Florian Dingler to previous | to last
3 21-Mar-2017 08:21 1 KB Florian Dingler to previous | to last
2 21-Mar-2017 08:20 1 KB Florian Dingler to previous | to last
1 21-Mar-2017 08:03 518 bytes Florian Dingler to last

Page References

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COLPM2
COLPM2

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Difference between version and

At line 1 changed 3 lines
||R/W||ADR||HEXADR||NAME||DESCRIPTION||DEFAULT||SHADOW||OS
|W|53268|$D014|COLPM2|Color of Player and Missile 2|0|[PCOLR2]|all
|R|53268|$D014|PAL|Determine TV System|see below|none|all
||ADR||HEXADR||NAME||DESCRIPTION||DEFAULT||SHADOW||OS
|53268|$D014|COLPM2|Color of Player and Missile 2|0|[PCOLR2]|all
At line 7 removed 6 lines
PAL (R) Used to determine if the Atari is PAL (European and Israeli TV compatible when BITs 1 - 3 equal zero) or NTSC (North American compatible when BITs 1 - 4 equal one; 14 decimal, $F). European Ataris run 12% slower if tied to the VBLANK cycle (the PAL VBLANK cycle is every 50th second rather than every 60th second). They use only one CPU clock at three MHZ, so the 6502 runs at 2.217 MHZ -- 25% faster than North American Ataris. Also, their $E000 and $F000 ROMs are different, so there are possible incompatibilities with North American Ataris in the cassette handling routines. There is a third TV standard called SECAM, used in France, the USSR, and parts of Africa. I am unaware if there is any Atari support for SECAM standards.
PAL TV has more scan lines per frame, 312 compared to 262. NTSC Ataris compensate by adding extra lines at the beginning of the VBLANK routine. Display lists do not have to be altered, and colors are the same because of a hardware modification.
See also: [PALNTS]
This page (revision-5) was last changed on 03-Feb-2023 15:21 by Florian Dingler  Top