Deactivate unshielded interrupts and start with a delay

AwardBios**02 Meaning determines the type of diagnosis, if the keyboard buffer contains data it will fail amibois deactivate unshielded interrupts, start by delay, phoenixbois and write readouts are in progress or malfunctioning.

Motherboard diagnostic card shows the workaround for 02:

If the keyboard buffer contains data, it will fail, amibois will be disabled, and unshielded interrupts will be disabled;

By delayed start, PhoenixBois and;

Write: Readout is in progress or malfunctioning;

Unplug the battery, drain it, don't connect the keyboard, just connect the motherboard and CPU to try it.

Check the diagnosis card yourself online**.

In the first sector of the hard disk (sector at cylinder 0, head 0, sector 1) is the master boot record (MBR).

When booting from the hard disk, int 19 tries to read the MBR, and if it finds the MBR, it reads it into the memory address 0000:7c00 and int 19 jumps inside.

Boot is a must for an operating system to boot, and installing the bootloader means that the computer is installing some kind of systematic boot General Windows XP bootloader is that this program can be opened as a document, which records the boot information of the hard disk.

Award BIOS: Determine the type of diagnosis (normal or manufactured). If the keyboard buffer contains data, it will fail.

AMI BIOS: Disable unmasked interrupts; Start with a delay.

Phoenix BIOS and Tandy 3000 BIOS: CMOS Write readout is in progress or fails.

Indicate that your CPU is already moving, flash the BIOS or check the control part of the keyboard (such as the IO chip).

Flashing the BIOS requires a refresh program, which can be found on the motherboard manufacturer's web page, for example.

A BIOS file is also required, generally. Bin file, the size is about 100 to hundreds of k.

There is a tool to brush BIOS under Windows,But it's best to refresh under the pure DOS,Don't power off the process of refreshing,If the power is off or there is no display after brushing,Under normal circumstances, the motherboard needs to be repaired by the manufacturer,If you have a programmer, it doesn't matter。

Depending on which manufacturer your BIOS chip has, different manufacturers have different diagnostic parameters.

1、"c1"In the memory read and write test, if the memory is not plugged in, or the frequency is too high, it will be considered by the BIOS that there is no memory module, then the POST will be stopped.

This kind of ** to learn to accumulate, if FF,00 is the motherboard or CPU does not work E0, D2,D3,D4 is the memory has not been over 25,26 graphics card, but F0,0F 41,44,14 are BIOS problems.

Motherboard Detection Card** References are pretty much the same! The key is whether the card can run the code correctly, in addition, it is useless to just look at the **, it can only be a reference, but also with a multimeter, oscilloscope and other tools.