PORTIBM PC Portable (uses same BIOS as XT) 7AEE - ATI Mach8/Mach32 - EXTENDED GRAPHICS ENGINE CONGIFURATION
SeeAlso: PORTIBM PC Portable (uses same BIOS as XT) 8EEEh
7AEEw -W extended graphics engine configuration (see #P1025)
Bitfields for Mach8/Mach32 extended graphics engine configuration:
Bit(s) Description (Table P1025)
15 drawing pixel size to be written next (68800-6 only)
14 enable 8-bit DAC(Digital-to-Analog Converter) A hardware device (in its simplest form, nothing more than a set of interconnected resistors) which converts a digital number into an analog signal whose voltage is proportional to the value of the digital number. VGAVideo Graphics Array and later color video boards use DACs to convert color values into the analog signals sent to the display; sound boards normally use DACs as well. (Mach-32 only)
13-12 DAC(Digital-to-Analog Converter) A hardware device (in its simplest form, nothing more than a set of interconnected resistors) which converts a digital number into an analog signal whose voltage is proportional to the value of the digital number. VGAVideo Graphics Array and later color video boards use DACs to convert color values into the analog signals sent to the display; sound boards normally use DACs as well. address inputs RS(3:2) control (Mach-32 only)
11 display pixel size to be written next (68800-6 only)
10 24-bit color order (Mach-32 only)
0 = RGB(Red-Green-Blue) The color specification mechanism normally used in computer displays, where colors are separated into their primary-color components. See also YUV.
1 = BGR
9 24-bit color configuration: pixels use 4 bytes instead of three
8 DAC(Digital-to-Analog Converter) A hardware device (in its simplest form, nothing more than a set of interconnected resistors) which converts a digital number into an analog signal whose voltage is proportional to the value of the digital number. VGAVideo Graphics Array and later color video boards use DACs to convert color values into the analog signals sent to the display; sound boards normally use DACs as well. processes four pixels in parallel (Mach-32 only)
7-6 16-bits-per-color word format (Mach-32 only)
00 RGB(Red-Green-Blue) The color specification mechanism normally used in computer displays, where colors are separated into their primary-color components. See also YUV.(5,5,5)
01 RGB(Red-Green-Blue) The color specification mechanism normally used in computer displays, where colors are separated into their primary-color components. See also YUV.(5,6,5)
10 RGB(Red-Green-Blue) The color specification mechanism normally used in computer displays, where colors are separated into their primary-color components. See also YUV.(6,5,5)
11 RGB(Red-Green-Blue) The color specification mechanism normally used in computer displays, where colors are separated into their primary-color components. See also YUV.(6,6,4)
5-4 number of bits per pixel (Mach-32 only)
00 four
01 eight
10 sixteen
11 twenty-four
3 report monitor alias instead of actual monitor
2-0 alternate monitor ID (alias)