tomlin@elec.canterbury.ac.nz (M. Tomlinson) (04/29/91)
How does PC software know which BIOS version you are using? Specifically, for the keyboard BIOS call (number 16) there are extra functions available for reading keyboard status, and getting a key from the keyboard. How do programs know` whether these functions are available, or whether they should stick with the ones originally provided on the PC/XT machines? Presumably the BIOS date and machine id byte (at FFFF:FFFE) can be used, but is there some other way? (PS - don't just give me the best way - I want to know how existing software does it.) - Mark Tomlinson (tomlinson@elec.canterbury.ac.nz)