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POST procedures and general codes
Zenith
LEDs on system board to indicate the status of various stages of boot-up. All will light up first of all, then go out in sequence when the test concerned is completed. Zenith computers may also use an AMI (Plus, normally) or a Phoenix BIOS.
Post Procedures

Procedure

Meaning

CPU

Perform a read/write test on the internal register. Check for defective CPU or clock generator.

ROM BIOS

Check the CRC value stored in ROM against the computed value of this test. Check the BIOS or I/O circuitry.

RAM

Check first 64K of memory to see that data can be stored in it so the BIOS can use it later.

DMA

Test the register functions of the DMA chips.

PIT/PIC

Perform tests on the main support chips and enable the appropriate interrupts when completed. Check also for AC ripple.

RTC/CMOS

Check the validity of the CMOS RAM and compare value in CMOS with appropriate devices. The BIOS will use the values from the CMOS to set up appropriate IRQ routines for disk and other I/O access. Check for defective CMOS/battery/adapter or CMOS setting.

Video Display

Attempts will be made to initialise video to a mono screen very early on so error messages can be displayed. This test is for initialising upper video modes available with EGA/VGA.

Test/Boot to Diskette

Check the floppy subsystem and prepare the drive for boot if there is a bootable floppy in the A: drive.

Boot to Fixed Disk

Initialise any fixed disks in the CMOS and give control to the first one if a bootable floppy has not been detected previously. Check for corrupt boot code if not a hardware error.

General POST Codes

Code

Meaning

01

VGA check

02

MDA initialise

03

Initialise video

05

Set hard reset

07

Check ROM at E000

08

Check ROM shadow at F000

09

Remap video to E000

0B

Keyboard controller test

0C

CMOS/8042 test

0D

DMA test

0E

DMA page register

0F

Test 64K memory

10

Test base memory

11

Second VGA unit

12

Mono initialisation

13

RTC/CMOS test

15

CPU register test

16

CPU add test

17

RTC/8042 test

18

Enter protected mode

19

Testing memory

1A

Testing extended memory

1B

Leaving protected mode

1C

Testing system board

1D

Testing system board

1E

Testing system board

1F

Bus sizing

20

Set BIOS data area

21

Testing DMA

22

Checking C800 for ROM

24

Testing base memory

25

8042 test

26

8042 test

27

8042 test

28

Memory parity test

29

PIT test

2A

Testing floppy disk

2B

Testing FDC/drives

2C

Testing HDC/drives

2D

Checking CMOS settings

2E

Soft configuration

30

Checking adapter ROM

31

Checking CMOS settings

32

Enabling interrupts

33

Soft configuration

34

Soft configuration

35

Jump to boot code

00

Boot to OS

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