What Are Two Possible Settings in CMOS for Parallel Port Mode?
- The CMOS chip stores information used to boot up the computer and initialize components like the hard drive, keyboard and ports. CMOS settings are also known as BIOS settings. You access the CMOS setup menu by pressing a particular key during computer start-up; check your computer's user guide or onscreen help for the key used for your computer. Note that the CMOS menu includes settings critical to the computer, such as the boot sequence and security features. To ensure that your computer runs properly, use caution when changing any CMOS settings.
- EPP is used primarily for storage devices like external hard drives. Depending on its associated device, EPP can operate as uni-directional or bi-directional and can transfer data at rates ranging from 500 Kbps to 2 Mbps.
- ECP is used primarily for printers and scanners because it can efficiently transfer large amounts of data at a time. Its extended capabilities include data compression and decompression and Direct Memory Access (DMA). DMA enables ECP to access system memory for its tasks instead of the CPU, so its operation does not slow down computer processing time. Depending on its associated device, ECP, like EPP, can operate as uni-directional or bi-directional and can transfer data at rates ranging from 500 Kbps to 2 Mbps.
- You can disable and enable ports through Windows Device Manager. There are two reasons to disable a port: the port is not used, or there is a communication conflict between it and another port.
