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Chips and Technologies POST Procedures

Procedure

Meaning

Power On Tests

CPU synchronises with clock. Check the CPU or clock.

System ROM Check

The BIOS runs a checksum on itself. Check the BIOS chips.

DMA Controller Fail

DMA Controllers are initialised and tested. Check the DMA chips.

System Timer Failed

Channels 0/1/2 are tested in sequence. Check the PIT chips.

Base 64K Memory Testing

Walking-bit test performed on 1st 64K of RAM which is critical for the BIOS vector area to be initialised. Check for bad RAM chips or a data or address line.

Interrupt Contr Failed

Test the 8259 chip.

CPU Still In Protected Mode

Attempts are made to read the configuration of the system through the 8042 keyboard controller.

Refresh Not Occurring

Memory refresh is tested; standard refresh is 120-140 ns. Check the PIT chip.

Keyboard Controller Not Responding

Tests are run on the keyboard controller. Check the 8042 chip.

Could Not Enter Protected Mode

BIOS attempts to enter protected mode to test extended memory. Check the 8042 chip or the A20 address line.

Initialise Timer

Attempts are made to initialise the PIT.

Initi DMA Controller

Attempts are made to initialise the DMA Controller.

Entering/Exiting Protected Mode

The transition is handled by the keyboard controller and the A20 line. Check the 8042 or the A20.

Relocate Shadow RAM

BIOS attempts to shadow itself into extended memory. Check for memory problems.

Test For EMS

Check the EMS adapter or an improper CMOS/Jumper setting.

Test Video Capabilities

Normally includes a memory test on the adapter memory up to 256K.

Test Memory

Extensive testing of Base, Extended, Expanded memory. Check for defective memory modules; 8042 chip; A20 line or an improper CMOS/Jumper setting.

Check System Options

The hardware in the system is compared with the values stored in CMOS. The PIT/PIC/8042/RTC and other system board chips are tested again.

Peripheral Check/Test

Checks are made for peripherals at standard I/O ports including serial and parallel ports keyboards and maths coprocessors. You should see an error message on screen at this point.

Floppy Test

Floppy devices set in CMOS are checked and initialised. If a bootable floppy is found the fixed disks are tested and the BIOS will boot to the floppy disk. Check for defective controllers or an improper CMOS Setup.

Fixed Disk Test

Checks for fixed disks in CMOS. If no bootable floppy in the A: drive the BIOS loads the first sector off the first fixed disk and jumps to the area of memory where the sector was loaded. You may just see a flashing cursor or an error message from the potential operating system. Check for improper CMOS setup/defective controller/fixed disk or corruption of bootloader software on the fixed disk.

Advanced Options

These include mouse/cache etc. You should see an error message on the screen at this point, except that a defective cache may hang the system; in most cases, the cache will be disabled by the BIOS.

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