davidg@uns-helios.nevada.edu (DAVID GONZALES) (02/15/90)
hi, I am trying to write a program that will program a Orchid VGA card in a non-DOS, non-INTEL environment (ie - a 68000-based system). I have been using the Input/Output ports of the VGA card but have been unable to set the mode. Or I should say that I think that I am changing the mode correctly but I am getting no video to the screen. I have been using a 386-based DOS machine as a test base but after setting the registers the screen goes blank and I need to use a MODE CO80 command to reset the card back to normal. My question is: Is there a trick to setting the mode via I/O calls or is there a register that I am missing (or am i failing to set a certain bit in the register(s)). I have the Technical Reference Manual (from TSENG) that gives me all the register contents for each of the modes that the card supports but I do not have much information about programming the card (they use the BIOS!). Thanks. david a. gonzales ERC/UNLV