GFXMODE 16bit register selecting the screen size and the pixelformat for the Chunky plane. +-------+----------+-------------------------------------------+ | BIT# | FUNCTION | DESCRIPTION | +-------+----------+-----------------------------------------+ | 15.08 | Resolution | $00 | | | $01 = 320x200 60Hz | | | $02 = 320x240 60Hz | | | $03 = 320x256 60Hz | | | $04 = 640x400 60Hz | | | $05 = 640x480 60Hz | | | $06 = 640x512 50Hz | | | $07 = 960x540 60Hz | | | $08 = 480x270 60Hz | | | $09 = 304x224 60Hz | | | $0A = 1280x720 50Hz | | | $0B = 640x360 50Hz | | | $0C = 800x600 60Hz | | | $0D = 1024x768 60Hz | | | $0E = 720x576 50Hz | | | $0F = 848x480 60Hz | | | $10 = 640x200 60Hz | | | $11 = 1920x1080 24Hz | | | $12 = 1280x1024 50Hz | | | $13 = 1280x800 60Hz | | | $14 = 1440x900 50Hz | +-------+----------+-----------------------------------------+ | 07.00 | Pixelformat | $00 | | | $01 = 8bit CHUNKY (indexed) | | | $02 = 16bit R5G6B5 | | | $03 = 15bit 1R5G5B5 | | | $04 = 24bit R8G8B8 | | | $05 = 32bit A8R8G8B8 | | | $06 = YUV | | | $07 = | | | $08 = PLANAR 1BIT ATARI | | | $09 = PLANAR 2BIT ATARI | | | $0A = PLANAR 4BIT ATARI | | | $0B = PLANAR 8BIT ATARI | +-------+----------+-----------------------------------------+