1. Introduction
The Quatech QSP-100 provides four independent RS-232 asynchronous serial communications interfaces for systems equipped with PCMCIA Type II and/or Type III expansion sockets. The QSP-100 is a PCMCIA Type II (5 mm) card and is PCMCIA PC Card Standard Specification 2.1 compliant.
The QSP-100's serial ports are implemented using 16C550 Universal Asynchronous Receiver/Transmitters (UARTs) which are the recommended communications interface for multitasking environments and with applications involving high data transfer rates.
The QSP-100's four serial ports are addressed in a single 32 byte I/O block for simplified programming and all four channels share a common interrupt (IRQ). A special interrupt status register is also available to simplify the software required to service multiple serial ports in an interrupt driven environments.
