User’s Manual
Uncompressed Initialization Codes — The following runtime checkpoint hex codes are listed in order of execution. These codes are uncompressed in F0000h shadow RAM.
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| Code | Description |
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| 03 | The NMI is disabled. Next, checking for a soft reset or a power on |
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| condition. |
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| 05 | The BIOS stack has been built. Next, disabling cache memory. |
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| 06 | Uncompressing the POST code next. |
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| 07 | Next, initializing the CPU and the CPU data area. |
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| 08 | The CMOS checksum calculation is done next. |
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| 0B | Next, performing any required initialization before the keyboard BAT |
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| command is issued. |
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| 0C | The keyboard controller input buffer is free. Next, issuing the BAT |
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| command to the keyboard controller. |
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| 0E | The keyboard controller BAT command result has been verified. Next, |
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| performing any necessary INIT after the K/B controller BAT command |
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| test. |
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| 0F | The keyboard command byte is written next. |
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| 10 | Next, issuing the pin 23 and 24 blocking and unblocking commands. |
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| 11 | Next, checking if the <End> or <Ins> keys were pressed during power |
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| on. |
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| 12 | To initialize CMOS if the initialize CMOS RAM in every boot is set or |
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| the <End> key is pressed. Going to disable DMA and Interrupt |
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| controllers. |
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| 13 | The video display has been disabled. Port B has been initialized. Next, |
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| initialising the chipset. |
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| 14 | The 8254 timer test will begin next. |
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| 19 | The 8254 timer test is over. Starting the memory refresh test next. |
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| 1A | The memory refresh line is toggling. Checking the 15us on/off time |
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| next. |
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| 23 | Reading the 8042 input port and disabling the MEGAKEY Green PC |
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| feature next. Making the BIOS code segment writable and performing |
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| any necessary configuration before initializing the interrupt vectors. |
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| 24 | The configuration or setup required before interrupt vector initialization |
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| has completed. Interrupt vector init. is about to begin |
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| 25 | Interrupt vector initialization is done. Clearing the password if the |
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| POST DIAG switch is on. |
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| 27 | Any initialization before setting video mode to be done. |
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| 28 | Going for monochrome mode and color mode setting. |
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