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This page (revision-5) was last changed on 01-Mar-2020 16:50 by Florian Dingler  

This page was created on 21-Mar-2017 09:03 by Florian Dingler

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Difference between version and

At line 1 changed 2 lines
||ADR||HEXADR||NAME||DESCRIPTION||DEFAULT||SHADOW||OS
|53268|$D014|COLPM2|Color of Player and Missile 2|0|[PCOLR2]|all
||R/W||ADR||HEXADR||NAME||DESCRIPTION||DEFAULT||SHADOW||OS
|W|53268|$D014|COLPM2|Color of Player and Missile 2|0|[PCOLR2]|all
|R|53268|$D014|COLPM2|PAL|0|none|all
At line 7 added 4 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 - 3 equal one; 14 decimal, $E). 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.
Version Date Modified Size Author Changes ... Change note
5 01-Mar-2020 16:50 1.599 kB Florian Dingler to previous
4 08-Dec-2018 18:53 1.576 kB Florian Dingler to previous | to last
3 21-Mar-2017 09:21 1.568 kB Florian Dingler to previous | to last
2 21-Mar-2017 09:20 1.555 kB Florian Dingler to previous | to last
1 21-Mar-2017 09:03 0.518 kB Florian Dingler to last
« This page (revision-5) was last changed on 01-Mar-2020 16:50 by Florian Dingler  
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