Chapter 6 Appendix
103
Code(hex)
Name
Description
3C
Test Timer
Test 8254 Timer 0 Counter 2.
3D
Reserved
3E
Test 8259-1 Mask
Verify 8259 Channel 1 masked
interrupts by alternately turning off
and on the interrupt lines.
3F
Reserved
40
Test 8259-2 Mask
Verify 8259 Channel 2 masked
interrupts by alternately turning off
and on the interrupt lines.
41
Reserved
42
Reserved
43
Test Stuck Interrupt
Turn off interrupts then verify no
8259's Interrupt interrupt mask
register is on. Test 8259 Force an
interrupt and verify the interrupt
occurred.
44
Reserved
45
Reinit serial port
Reinitialize Preboot agent serial port
46
Reserved
47
EISA Test
If EISA non-volatile memory
checksum is good, execute EISA
initialization. If not, execute ISA tests
and clear EISA mode flag.
48
Reserved
49
Size Memory
Size base memory from 256K to
640K and extended memory above
1MB.
4A
Reserved
4B
Reserved
4C
Reserved
4D
Reserved
4E
Init APIC
Initialize APIC and set MTRR
4F
Reserved
50
USB init
Initialize USB controller
51
Reserved
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