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7Eh The Coprocessor initialization test. Use the
floating point instructions to determine if a
coprocessor exists instead of the ET bit in
CR0.
80h Disable onboard COM and LPT ports before
testing for presence of external I/O devices.
81h Run late device initialization routines.
82h Test and identify RS232 ports.
83h Configure Fisk Disk Controller.
84h Test and identify parallel ports.
85h Display any ESCD read errors and configure
all PnP ISA devices.
86h Initialize onboard I/O and BDA according to
CMOS and presence of external devices.
87h Initialize motherboard configurable devices.
88h Initialize interrupt controller.
89h Enable NMI.
8Ah Initialize Extended BIOS Data Area and ini-
tialize the mouse.
8Bh Setup interrupt vector and present bit in
Equipment byte.
8Ch Initialize both of the floppy disks and dis-
play an error message if failure was
detected. Check both drives to establish the
appropriate diskette types in the BIOS data
area.
8Fh Count the number of ATA drives in the sys-
tem and update the number in bdaFdis-
kcount.
Checkpoint
Code
Beep Code Description