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LA 120
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DEC LA 120 Technical Manual
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Contents
Table of Contents
Troubleshooting
Bookmarks
Table of Contents
Table of Contents
CHAPTER T OPERATORS INFORMATION
Introduction
Operator's Console
Lights
Local Control Keys
SET-UP Keys
Control Character Keys
Other Keys
Optional Numeric Keypad
Power ON/OFF Switch and Voltage Selector Switch
Cover Interlock Switch
Paper Adjust Knob
Tractor Adjust Knobs
Carriage Adjustment Lever
Alarm Indicators
Operator Testing and Troubleshooting
Chapter 2 Installation, Interface, and Specifications
Installation and Configuration
Unpacking and Inspection
Packing Procedures
Checkout Procedure
Answerback Jumper
Interface Information
Interface Signals
Protective Ground
Transmitted Data (TDX)
Received Data (RDX)
Request to Send (RTS)
Clear to Send (CTS)
Data Set Ready
Signal Ground
Carrier Detect (RLSD)
Secondary Request to Send (SRTS)
Speed Indicator (SPDI)
Secondary Carrier Detect (SRLSD)
Data Terminal Ready (DTR)
Ring Indicator (RI)
Speed Select (SPDS)
EIA Interface Cables
Impedance of Terminator
Rise and Fall Times
Chapter 3 Programmer's Information
General
Escape Sequences
Parser Program
Sequence Descriptions
Printer Character Sets
Active Position
Linefeed-Newline Mode
Horizontal Pitch
Horizontal Margins
Horizontal Tabs
Vertical Pitch
Form Length
Vertical Margins
Vertical Tabs
Product Identification
Alternate Keypad Mode
Control Characters
Null or Delete (NULL or DEL)
End of Text (ETX)
End of Transmission (Eat)
Enquiry (ENQ)
Bell (BEL)
Backspace (BS)
Horizontal Tab (HT)
Line Feed (LF)
Vertical Tab (VT)
Form Feed
Carriage Return
Shift in (SI)
Shift out (Sa)
Data Link Escape (OLE)
Escape (ESC)
Apl Character Set
Sample Form Setup Using Escape Sequences
Synchronization
Synchronization Limits
Fill Time Formulas
Horizontal Movement
Vertical Movement
Keyboard Operation
Auto Repeat
Printable Character Keys
Control Character Keys
CTRL (Control) Key
Optional Auxiliary Keypad
BREAK Key
VIEW Key
Chapter 4 La120 Theory of Operation
Basic System Configuration
Microprocessor
Device Addressing
Memory Space
I/O Space
Interrupts
Rom
Ram
Keyboard
Keyboard Addressing
Switch Matrix
Separately Decoded Keys
Display
Leds
Non-Volatile Memory
DC305 Printer Controller
8251A Usart
Utility I/O Ports
Dc305 Printer Controller
Dot Print Control
Carriage Position Count
Carriage Speed Control
Line Feed Control
Bell Control
Frequency Generation
Tick Alarm
Interrupt Vectors
La120 Firmware Overview
Scheduling
ROM Layout
RAM Layout
Print Control Firmware
Starting the Printing Operation
Flight Time Compensation
Dot Rate Limiting
Carriage Servo Firmware
Transitions
Reading the Position Counter
Carriage Speed Command
Error Conditions
Communication Firmware
Communication Modes
Local Mode
Disconnects
Full Duplex Without EIA Controls
Full Duplex with EIA Controls
Full-Duplex Break
Full-Duplex Disconnect
Restraint Mode
Speed Control Mode
Half Duplex
Initial Direction Determination
Reverse Channel
Request to Send Delay
Turnaround Characters
Half-Duplex Break
Half-Duplex Disconnect
Communication State Control
Communication State Table
Communication Handler
Control Code Generation and Detection
Input Scanning
Transmit Scanning
Control Code Generation
Functional State Diagrams
Escape Sequence Processing
Escape Sequence State Transition Table
Element No. 2
Element No. 3
Element No. 4
Element No. 5
Element No. 6
Element No. 7
Escape Sequence Jump Table
Escape Sequence Parser
Begin Parsing
Initialize Parser
Flow Controller
CSI Parameters
Control Strings
Final Character Perform-Function Routines
Set-Up Command Processing
SET-UP Command Implementation
Multiple Choice SET-UP Commands
Immediate Action SET-UP Commands
SET-UP Handler
SET-Up/Keyboard Handler Relationship
Character Processing
Character Reception
Background Executive
Print Line Builder
Answerback Entry Handler
General
DC Servo Test
Encoder Duty Cycle Check/Adjustment
Clock Test
Wake up Test
Print Character Test
Usart Test
Keyboard Test
Line Feed Test
Bell Test
Chapter 6 La120 Subassembly Removal and Installation
General
Printer Housing
Printer Housing Removal
Printer Housing Installation
Open Circuit Voltage
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