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This page (revision-2) was last changed on 01-Mar-2020 16:45 by Florian Dingler  

This page was created on 01-Mar-2020 15:04 by Florian Dingler

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Attract mode rotates colors on your screen at low luminance levels when the computer is on but no keyboard input is read for a long time (seven to nine minutes). This helps to save your TV screen from "burn-out" damage suf- fered from being left on and not used. It is set to zero by IRQ whenever a key is pressed, otherwise incremented every four seconds by VBLANK (see locations 18 - 20; $12 - $14). When the value in ATRACT reaches 127 ($7F), it is then set to 254 ($FE) until attract mode is terminated. This sets the flag to reduce the luminance and rotate the colors when the Atari is sitting idle. POKE with 128 ($80) to see this effect immediately: it normally takes seven to nine minutes to enable the attract mode. The OS cannot "attract" color generated by DLI's, although your DLI routine can, at a loss of time.
Attract mode rotates colors on your screen at low luminance levels when the computer is on but no keyboard input is read for a long time (seven to nine minutes). This helps to save your TV screen from "burn-out" damage suffered from being left on and not used. It is set to zero by IRQ whenever a key is pressed, otherwise incremented every four seconds by VBLANK (see locations 18 - 20; $12 - $14). When the value in ATRACT reaches 127 ($7F), it is then set to 254 ($FE) until attract mode is terminated. This sets the flag to reduce the luminance and rotate the colors when the Atari is sitting idle. POKE with 128 ($80) to see this effect immediately: it normally takes seven to nine minutes to enable the attract mode. The OS cannot "attract" color generated by DLI's, although your DLI routine can, at a loss of time.
At line 6 added 5 lines
See also:
[DRKMSK], [COLRSH]
Version Date Modified Size Author Changes ... Change note
2 01-Mar-2020 16:45 1.203 kB Florian Dingler to previous
1 01-Mar-2020 15:04 1.168 kB Florian Dingler to last
« This page (revision-2) was last changed on 01-Mar-2020 16:45 by Florian Dingler