patch

[valette at crf.canon.fr (VALETTE Eric)]

>>>>> "joel" == joel  <joel at OARcorp.com> writes:

joel> On Mon, 7 Sep 1998, VALETTE Eric wrote:

>> >>>>> "joel" == joel  <joel at OARcorp.com> writes:
>> 

joel> What is done in more embedded PC's to avoid this?  In a normal PC, you
joel> would always have a video card.  In an embedded PC, this must be handled.  
joel> I assume the BIOS in the embedded PC is a bit more lenient in this regard
joel> and continues.  Still there has to be a way for this to be represented in
joel> the CMOS which is at worst an extension to the standard settings.

Yes our BIOS for the configuration without monitor is a non-standart
BIOS (AMI). Spend almost yesterday afternoon searching the WEB for the 
right location to poll. Found something but had not got time to test 
so far.

---------------------------------------------------------
INT 10 - VIDEO - DISPLAY COMBINATION (PS,VGA/MCGA)
        AH = 1Ah
        AL = 00h read display combination code
Return:          BL = active display code (see below)
                 BH = alternate display code
             01h set display combination code
                 BL = active display code (see below)
                 BH = alternate display code
Return: AL = 1Ah if function was supported

Values for display combination code:
  00h no display
  01h monochrome adapter w/ monochrome display
  02h CGA w/ color display
  03h reserved
  04h EGA w/ color display
  05h EGA w/ monochrome display
  06h PGA w/ color display
  07h VGA w/ monochrome analog display
  08h VGA w/ color analog display
  09h reserved
  0Ah MCGA w/ digital color display
  0Bh MCGA w/ monochrome analog display
  0Ch MCGA w/ color analog display
  FFh unknown display type
--------------------------------------------------------

What I still need to know is where is stored the relevant 
configuration value (display combination code) and how
to access it as int $0x10 is no more valid...

-- eric.