Table of Contents
Advertisement
1.3
FEATURES OF THE HSIO-4
Synchronous/Asynchronous
Baud Rate Selection
Mode Configuration
Buffer Full Signals
Interrupts
North Star HSIO-4
The HSIO-4 is a 4-port serial input/output
board designed by North Star Computers, Inc.,
for use with the HORIZON and North Star
multi-user systems.
is configured for use with the North Star
TSS/A Multi-User System for Application
Software.
Additional capabilities provide
flexibility and permit operation in a variety
of hardware and software environments.
The HSIO-4 provides four serial input/output
ports which may be configured for synchronous
or asynchronous communications.
Baud rates are programmable and may be
selected from among ten available
asynchronous baud rates and five available
synchronous baud rates.
changes provide additional baud rates.
Asynchronous Range:
Synchronous Range:
All four ports use RS-232 signal levels.
hardware change permits 20mA current loop
operation.
As supplied, each port is wired
for connection to a standard terminal or
printer. Each port has a configuration header
which may be changed to permit connection to a
modem or another computer.
The HSIO-4 accomodates printers and other
peripheral devices using 'buffer full'
signals.
Each port provides four sources of interrupt;
three are maskable, the fourth is armed by a
jumper.
The resultant interrupt from each
port may be connected to any of the S-100 bus
interrupt lines.
As supplied, the HSIO-4
Simple wiring
75 baud to 19.2K baud
1.76K baud to 55.8K baud
3
User/Technical Manual
A
Advertisement
Table of Contents
