HP Vectra Technical Reference Manual page 434

APPENDIX G
G. DRIVER WRITER'S GUIDE
This appendix describes how a programmer can add drivers to the ROM BIOS. One of the
important features of the EX-BIOS is the ease with which it can be expanded. This capability
allows programmers to take full advantage of HP system components (such as the HP-HIL touch
screen, mouse, tablet, etc.). In addition, the EX-BIOS architecture provides a simple, yet powerful
way to integrate OEM and third-party products into the system.
G.1 Who Should Read This Appendix
This appendix is intended for all programmers and advanced users who wish to utilize EX-BIOS
capabilities not supported by system software. It assumes that the reader is familiar with the
contents of Sections 1 through 10, iAPX286 programming, DOS concepts in general, and DOS
installable device drivers in particular. The reader should consult the publications listed under the
References section at the end of this manual for additional information on these topics.
G.2 Introduction
, . . This appendix presents two examples of how drivers that interface to the system's EX-BIOS can
be written. All aspects of how a driver gets connected and used through the EX-BIOS are
discussed.
Driver Writer's Guide 425