Quatech DSP-100 - Manual (Page 7)

1. Introduction
The DSP-100 provides two independent RS-232 asynchronous serial communications
interfaces for systems equipped with PCMCIA Type II and/or Type III expansion
sockets. The DSP-100 is a PCMCIA Type II (5 mm) card and is PCMCIA PC Card
Standard Specification 2.1 compliant.
The DSP-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 DSP-100's two serial ports are addressable in two modes:
1. 'Block Mode': The two serial ports are configured in one 16-byte continuous
block of I/O address space. The block must begin on an even 16-byte
division. Both serial ports share one IRQ level.
2. 'COM Mode': The two serial ports are configured at the standard COM port
I/O address locations. The ports may be configured as COM1 and COM3;
also, the ports may be configured as COM2 and COM4. Both serial ports
share one IRQ level.
A special interrupt status register is also available to simplify the software required to
service multiple serial ports in an interrupt driven environments. See the Hardware
Information section for details.
DSP-100 User's Manual 1