Texas Instruments 990 User Manual page 87

Applications Programming
Section 4
Applications Programming
4.1 GENERAL
This section provides the information necessary to write
applications programs that utilize the DXlO HDLC Communications
Package. Applications programs may be written in assembly
language, FORTRAN, or Pascal, for execution under DXIO, release
3.4, or TXS, release 3.2.0.
The interface between applications programs and the
communications package is provided by DXIO and TX5 supervisor
calls (SVCs) that perform the following functions:
*
Write (send/transmit) data
*
Read (receive) input data
*
Request activation services
In order to use the communications package effectively, the
applications programmer must be familiar with the following:
*
The network configuration
*
The network ID of each station and applications program
that sends or receives information
*
The output of the network generator program, NETGEN,
particularly:
The maximum buffer size of each station
The assignment of task IDs
The following paragraphs discuss the SVCs, and describe the
input/output operations and assembly language requests for
activation services. Following this are examples of applications
programs resident in different computers in the same network
(that is, in communication with each other).
2270526-9701 4-1