PORT 80 CODES (continued)
Code
Description
4D
Memory above 1MB cleared. (SOFT RESET)
Going to save the memory size. (Go to checkpoint 52H.)
4E
Memory test started. (NOT SOFT RESET)
About to display the first 64KB memory size.
4F
Memory size display started. This will be updated during memory test.
Going for sequential and random memory tests.
50
Memory testing/initialization below 1MB complete. Going to adjust
the displayed memory size for relocation/shadow.
51
Memory size display adjusted due to relocation/shadow. Memory
test above 1MB to follow.
52
Memory testing/initialization above 1MB complete. Going to save
memory size information.
53
Memory size information is saved. CPU registers are saved. Going to
enter in real mode.
54
Shutdown was successful, CPU in real mode. Going to disable
Gate A20 line and disable parity/NMI.
57
A20 address line, parity/NMI disable successful. Going to adjust
memory size depending on relocation/shadow.
58
Memory size adjusted for relocation/shadow. Going to clear "Hit <DEL>"
message.
59
"Hit <DEL>" message cleared. "Wait..." message displayed. About to
start DMA and interrupt controller tests.
60
DMA page register test passed. To do DMA#1 base register test next.
62
DMA#1 base register test passed. To do DMA#2 base register test next.
65
DMA#2 base register test passed. To program DMA units 1 and 2 next.
66
DMA units 1 and 2 programming over. To initialize the 8259 interrupt
controller next.
67
8259 initialization over.
7F
Extended NMI sources enabling is in progress.
80
Keyboard test started. Clearing output buffer, checking for stuck key.
About to issue keyboard reset command.
BIOS MESSAGES
TECHNICAL REFERENCE
A-11
Summary of Contents for SB586TCP/166
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