The so-called BIOS, in fact, is the basic input output system (BasicInputOutputSystem) of the computer, its content is integrated on a ROM chip on the industrial control motherboard, which mainly saves the most important basic input\/output programs and system information Settings about the computer system. Power-on self-test program and system startup self-test program, etc.
The BIOS chip is a rectangular or square chip on the motherboard, so what is our industrial computer BIOS mainly dealing with? In our industrial computer BIOS mainly deals with the following aspects:
Self-diagnostic program: by reading the content in CMOS\/RAM to identify the hardware configuration, and self-test and initialization;
2. CMOS setup program: start with a special hotkey during the boot process and save the setup in CMOS\/RAM;
Third, the system self-test loading program: after the successful self-test, the disk relative to 0 0 sectors on the boot program into the memory, let it run to install DOS system, from the functional point of view, the role of the industrial computer BIOS Settings is mainly divided into the following parts:
1, boot program, in the industrial control host power self-test and initialization after completion, need to use BIOS boot DOS or other operating systems. At this point, the BIOS first reads the boot record from the start sector of the floppy or hard disk, and if it is not found, it will show that there is no boot device on the display. If the boot record is found, the control of the industrial computer will be transferred to the boot record, and the boot record will load the operating system into the industrial computer, and after the successful startup of the industrial computer, this part of the BIOS task is completed.
2, program service processing, program service processing instructions are mainly for applications and industrial computer operating system services, in order to complete these services, the industrial computer BIOS Settings must be directly with the industrial computer I\/O equipment, through the port to issue commands to a variety of external devices to transmit data and receive data from them, so that the program can be separated from specific hardware operations.
3, hardware interrupt processing, at startup, the BIOS will detect the hardware system of the industrial computer through the self-test program, and will tell the interrupt number of each hardware device CUP, such as video service, the interrupt number is 10H; Screen print, interrupt number 05H; Disk and serial port services, interrupt number 14H, etc. When the user issues a command to use a device, the CUP uses the corresponding hardware to complete the work according to the interrupt number, and then jumps back to the original work according to the interrupt number.
In general, BIOS Settings are indispensable for our industrial computer motherboard.