Zenith Data Systems MT2000 manual Problem Solving

6-23

		Table 6-3. POST Tests (continued)
Code	Beeps	POST Routine Description
88	3-1-3-1	Initialize BIOS Data Area
8A	3-1-3-3	Initialize Extended BIOS Data Area
8C	3-1-4-1	Initialize floppy controller
90	3-2-1-1	Initialize hard disk drives
91	3-2-1-2	Initialize local-bus hard-disk controller
92	3-2-1-3	Jump to UserPatch2
94	3-2-2-1	Disable A20 address line
96	3-2-2-3	Clear huge ES segment register
98	3-2-3-1	Search for option ROMs. One long, two short beeps on checksum failure
9A	3-2-3-3	Shadow option ROMs
9C	3-2-4-1	Set up Power Management
9E	3-2-4-3	Enable hardware interrupts
A0	3-3-1-1	Set time of day
A2	3-3-1-3	Check key lock
A8	3-3-3-1	Erase F2 prompt
AA	3-3-3-3	Scan for F2 keystroke
AC	3-3-4-1	Enter SETUP
AE	3-3-4-3	Clear in-POST flag
B0	3-4-1-1	Check for errors
B2	3-4-1-3	POST done - prepare to boot operating system
B4	3-4-2-1	One short beep before boot
B6	3-4-2-3	Check password (optional)
B8	3-4-3-1	Clear global descriptor table
BC	3-4-4-1	Clear parity checkers
BE	3-4-4-3	Clear screen (optional)
BF	3-4-4-4	Check virus and backup reminders
C0	4-1-1-1	Try to boot with INT 19
D0	4-2-1-1	Interrupt handler error
D2	4-2-1-3	Unknown interrupt error
D4	4-2-2-1	Pending interrupt error
D6	4-2-2-3	Initialize option ROM error
D8	4-2-3-1	Shutdown error
DA	4-2-3-3	Extended Block Move
DC	4-2-4-1	Shutdown 10 error
DE	4-2-4-3	Keyboard Controller Failure

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