holly@osu-eddie.UUCP (02/15/87)
References: I have written my own print screen routine. I did this to add some features that are not found in the BIOS print screen. According to Norton's "Programmer's Guide to the IBM PC", the IBMBIO.COM file contains extensions to ROM-BIOS. And "All that is necessary, besides the new routine, is that the interrupt vectors for the previous routins be changed to point to the location in memory where the new routines are placed." He also mentions something about installable device drivers. Now that I have the routine, I'd like to make it active when Shift PrtSc is pressed. Are there any suggestions? Could I make this a device driver and then somehow change the interrupt vector to point to the new location? Is there a "cookbook guide" for writting and installing device drivers and/or for fiddling with the IBMBIO.COM file? Answers to all these questions are welcome. Thanks Joe Hollingsworth hollingsworth-j@osu-20.arpa holly@osu-eddie.uucp