Table of Contents
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SECTION 4
SECTION 5
APPENDICES
THEORY OF OPERATION
4.1 Address Decoder
4.2 Data Buffers
4.3 Baud Rate Generator
4.4 Interrupt Header
4.5 I/O Port
4.5.1 USART
4.5.2 Configuration and Clock Headers
4.5.3 Baud Rate Select Register
4.5.4 Interrupt Select Register
TROUBLESHOOTING
5.1 Creating a Test Diskette
5.1.1 Creating an Auto-Start DOS Diskette
5.1.2 Creating the Test Program
5.1.3 Configuring Basic for Auto-Start
Operation
5.2 Software Testing
5.3 Oscilloscope Testing
5.4 Repair Procedures
A. RS-232 Connector Pin Assignments
B. Notes On The Interface To The USART
and USART Manufacturer Specification
C. HSIO-4
Parts List
D. Schematic Drawings
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