COM
(1) In DOS systems, the name of a serial communications port. DOS supports four serial ports: COM1, COM2, COM3, and COM4. However, most software uses system interrupts to access the serial ports, and there are only two IRQ lines reserved. This means that the four COM ports share the same two IRQ lines. Typically, COM1 and COM3 use IRQ4, while COM2 and COM4 use IRQ3. So in general, if you have two devices, one of which is attached to COM1 and the other to COM3, you cannot use them simultaneously.
Read Also:
- COMMAND.COM
The DOS file that contains the DOS command processor.
- COM file
In DOS environments, a COM file is an executable command file with a.COM filename extension. COM files can be directly executed and are usually slightly smaller than equivalent EXE files. However, COM files cannot exceed 64K, so large programs are usually stored in EXE files.
- CONFIG.SYS
The configuration file for DOS systems. Whenever a DOS computer boots up, it reads the CONFIG.SYS file (if it exists) and executes any commands in it. The most common commands are BUFFERS= and FILES=, which enable you to specify the buffer size and the number of files that can be open simultaneously. In addition, you […]
- COPP
Short for Certified Output Protection Protocol, COPP is a device driver technology used to enable high-bandwidth Digital Content Protection (HDCP) during the transmission of digital video between applications and high-definition displays. COPP is a Microsoft security technology for video systems that require a logo certification. For security drivers are authenticated and protected from tampering to […]
- COR
Short for central outdoor router, the central router in a multi-device WLAN. The device is typically placed in a geographic central location and communicates with up 32 remote locations that use an ROR.