User`s manual

73 Appendix D
Code Name Description of check-point
0C Initialize keyboard detect type of keyboard controller
(optional). Set num_lock status.
0D Initialize video interface Detect CPU clock. Read interface
CMOS location 14h to find out type
of video in use. Detect and initialize
video adaptor.
0E Test video memory Test video memory, write sign-on
message to screen. Set up shadow
RAM-enable according to setup.
0F Test DMA controller 0 BIOS checksum test. Keyboard
detection and initialization.
10 Test DMA controller 1
11 Test DMA page registers Test DMA page registers.
12-13, 1B, 1E Reserved
14 Test timer counter 2 Test 8254 timer 0 counter 2.
15 Test 8259-1 mask bits Verify 8259 channel 1 masked
interrupts by alternately turning off
and on the interrupt lines.
16 Test 8259-2 mask bits Verify 8259 channel 2 masked
interrupts by alternately turning off
and on the interrupt lines.
17 Test 8259-1 mask bits Turn off interrupts then verify no
interrupt mask register is on.
18 Test 8259 interrupt Force an interrupt and verify the
functionalityinterrupt occurred.
19 Test stuck NMI bits Verify NMI can be cleared.
(parity/IO check)
1A Display CPU clock
20 Enable slot 0 Initialize slot 0 (system board).
21-2F Enable slots 1-15 Initialize slots 1 through 15.
30 Size base and extended Size base memory from 256 KB to
memory 640 KB and extended memory
above 1MB.
31 Test base and extended Test base memory from 256 KB to
memory 640 KB and extended memory
above 1 MB using various patterns.
Note: this will be skipped in EISA
mode and can be “skipped” with
ESC key in EISA mode.