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POST
DESCRIPTION
CODE
10
The Keyboard controller command byte has been written. Going to issue Pin-
23,24 blocking/unblocking command.
11
Keyboard controller pins 23 and 24 have been blocked and unblocked. See if
the <Ins> key was pressed during power-on next.
12
Checking for pressing of <Ins> key during power-on done. Going to disable
DMA and Interrupt controllers.
13
DMA controllers 1 and 2 and interrupt controllers 1 and 2 have been disabled.
The video display is disabled and port-B is initialized. Initializing the chipset
next.
15
Chipset initialization over. 8254 timer test about to start.
19
8254 timer test over. About to start the memory refresh test.
The memory refresh line is toggling. Going to check the 15 µsecond ON/OFF
1A
time next.
Memory refresh period 30 µsecond test complete. Base 64KB memory to be
20
initialized.
23
Base 64KB memory initialized. Going to set BIOS stack and to do any setup
before the interrupt vector initialization.
24
Setup required before vector initialization complete. Interrupt vector
initialization about to begin.
25
Interrupt vector initialization is done. Going to read the input port of the 8042
for turbo switch (if any) and to clear the password if the POST Diagnostic
switch is on.
26
The input port of the 8042 is read. Going to initialize global data for the turbo
switch.
27
The global data initialization for the turbo switch is over. Any required
initialization before setting video mode to be done next.
28
Initialization before setting the video mode is complete. Going for monochrome
mode and color mode setting.
2A
Different BUSes initialization (system, static, output devices) to start if present.
See section E.02 for details of different BUSes.
2B
About to give control for any setup required before optional video ROM check.
2C
Processing before video ROM control is done. About to look for optional video
ROM and pass control to this ROM, if present.
2D
Optional video ROM control is done. About to give control to do any
processing after video ROM returns control to POST.
2E
Return from processing after the video ROM control. If EGA or VGA is not
found, will do the display memory Read/Write test next.
2F
EGA/VGA not found. About to display the memory Read/Write test.
Post Codes & Error Codes
F-3
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