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41
4 BIOS overview
order in which the POST tests are performed
43 To enable interrupts for diagnostics mode.
44 To initialize data to check memory wrap around at 0:0.
45 Data initialized. Going to check for memory wrap around at 0:0 and finding the total system
memory size.
46 Memory wrap around test done. Memory size calculation over. About to go for writing patterns to
test memory.
47 Pattern to be tested written in extended memory. Going to write patterns in base 640k memory.
48 Patterns written in base memory. Going to findout amount of memory below 1M memory.
49 Amount of memory below 1M found and verified. Going to findout amount of memory above 1M
memory.
4B Amount of memory above 1M found and verified. Check for soft reset and going to clear memory
below 1M for soft reset. (If power on, go to check point# 4Eh).
4C Memory below 1M cleared.(SOFT RESET) Going to clear memory above 1M.
4D Memory above 1M cleared.(SOFT RESET) Going to save the memory size. (Goto check point# 52h).
4E Memory test started.(NOT SOFT RESET) About to display the first 64k memory size.
4F Memory size display started. This will be updated during memory test. Going for sequential and
random memory test.
50 Memory testing/initialization below 1M complete. Going to adjust displayed memory size for
relocation/ shadow.
51 Memory size display adjusted due to relocation/ shadow. Memory test above 1M to follow.
52 Memory testing/initialization above 1M 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 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. Going to clear
Hit <DEL> message.
59 Hit <DEL> message cleared. <WAIT...> message displayed. About to start DMA and
interrupt controller test.
60 DMA page register test passed. To do DMA#1 base register test.
62 DMA#1 base register test passed. To do DMA#2 base register test.
65 DMA#2 base register test passed. To program DMA unit 1 and 2.
66 DMA unit 1 and 2 programming over. To initialize 8259 interrupt controller.
7F Extended NMI sources enabling is in progress.