## Virtual Device Driver Reference for OS/2

[prev][next][parent][TOC]

### Support Summary

The VCOM directly supports invocations of BIOS INT 14h, instead of allowing the BIOS to access the ports directly. However, direct access to the virtual I/O ports is also supported. Direct access to I/O ports results in emulation of a communication controller with the INS8250 UART. When referenced through the virtual I/O ports, the VCOM also provides all support for virtual interrupt indication. The hardware appears to the DOS session as a serial interface supported by standard expansion bus serial ports on a PS/2 personal computer.