Technical data

Block Diagram
E-4
System I/O Functions
System input and output functions are controlled by the Super I/O controller. This
controller supports two serial UARTs, one parallel port, and the diskette controller. It
provides a buffer for the serial ports, and EPP/ECP modes for the parallel port. The
diskette controller has support for 360KB, 720KB, 1.2MB, 1.44MB, and 2.88MB
disks.
Serial Interface
Serial interface COM ports are accessible through the rear panel 9-pin
D-subminiature connectors. These connectors are functionally compatible with RS-
232C standards. Transfer rate is 115K bits/sec. The table below lists the serial
interface pin assignments.
Pin Number Function
1 Carrier Detect
2 Receive Data
3 Transmit Data
4 Data Terminal Ready
5 Signal Ground
6 Data Set Ready
7 Request to Send
8 Clear to Send
9 Ring Indicator