PORTIBM PC Portable (uses same BIOS as XT) 83C6-83C9 - Compaq Qvision EISA(Enhanced Industry-Standard Architecture) A 32-bit superset of the IBMInternational Busiuness Machines ATIBM PC AT's expansion bus (which is now known as the ISA or Industry-Standard Architecture bus). - 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. color registers
SeeAlso: PORTIBM PC Portable (uses same BIOS as XT) 03C6h
                                                                                

PORTIBM PC Portable (uses same BIOS as XT) 83C6-83C9 - Chips&Technologies 64200 (Wingine) - 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. color registers
SeeAlso: PORTIBM PC Portable (uses same BIOS as XT) 03C6h

83C6  RW  color palette pixel mask
83C7  R-  color palette state
83C7  -W  color palette read-mode index
83C8  RW  color palette write-mode index
83C9  RW  color palette data (three bytes)