IBM PC AT References
IBM 5170 Technical Reference (March 1984)
I/O Address Map
CMOS Addresses
BIOS Map
BIOS Listing
TEST.01: X286 Processor Test
TEST.02: Verify CMOS Shutdown
POST7 VERW/VERR
DISKETTE_IO_1
80286 and 80287 Programmers Reference Manual (1987)
Memory Organization and Segmentation
VERR/VERW