ACT apricot - Table of Contents

List of Contents Page
INTRODUCTION .................. ........... ................. ...... ...... 1
DESCRIPTION ... ..... ... .............. ......... ................. .... ........ 3
General ........................ ~ . .... .. ...... .. ... .. .. .. ........ .. ............. .... 3
SIO Overview .................................................................. 4
SIO Architecture ............................................................. 6
Processor Interface ....................................................... 10
Write Register Definition ............................................ 11
Read Register Definition ............................................. 25
SIO Interrupt Sequence ............................................... 30
KEYBOARD COMMUNICATIONS .......................... 32
General ......................................................................... 32
Keyboard Connector Detail ......................................... 33
Channel B Programming Details ................................ 34
PARALLEL INTERFACE INTERRUPTS ................... 36
RS232C COMMUNICATIONS .................................. 37
General ......................................................................... 37
RS232C Connector Detail ........................................... 38
Channel A Programming Details ................................ 39
SIOPINDETAIL .......................................................... 42
System Connections .................................................... 43
Channel A Connections .............................................. 44
Channel B Connections .............................................. 47
List of Illustrations
Figure
Serial Interface block diagram ........................................ 1
Keyboard
Connector detail ............................................. 2
RS232C
Connector detail ............................................... 3
INTRODUCTION
The Serial Interface is located on the System Board and
consists of the elements of circuitry as illustrated on the
block diagram Figure 1. The interface provides two separate
serial channels;
one channel for communication between
the Keyboard and the System Unit, the second channel for
communication between the Apricot and external
equipment via an RS232C link.