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General| Brand | Heathkit |
|---|---|
| Model | H9 |
| Category | Touch terminals |
| Language | English |
Explains keys that affect the display but do not transmit ASCII characters.
Describes keys that perform specific functions like Return, Line Feed, and Escape.
Covers PLOT mode, BAUD RATE, and OFF LINE functions for terminal operation.
Details keys like BREAK, FULL DUPLEX, XMIT PAGE, CTRL, SHIFT for terminal control.
Explains ASCII control characters and the HOLD SCREEN mode.
Explains programming the I/O circuit board for various input/output modes and settings.
Details EIA RS-232C serial connection configuration, including voltage levels.
Describes TTL serial connection configuration, logic levels, and jumper settings.
Details TTY serial connection configuration, current loop signals, and jumper settings.
Configuration for active TTY connection where Terminal supplies loop current.
Describes pin assignments and data signals for parallel I/O connections.
Timing waveforms for handshake signals in parallel I/O communication.
Describes pin nomenclature for serial I/O connections (TTY, EIA, TTL).
Diagram of typical computer system interfaces with H9.
Diagrams of typical I/O connections between H9 and paper tape reader/punch.
Guide for adjusting the display brightness for optimal viewing comfort.
Steps to adjust the focus for sharp and distinct character display.
Procedure for centering the display on the screen for proper alignment.
Instructions on how to adjust the vertical display height for optimal appearance.
Guide for changing display width settings using jumper wires.
How to select and change the keyboard repeat rate.
Instructions for cleaning the terminal cabinet and screen window.
General advice and checks for common kit assembly and soldering issues.
Detailed charts listing common problems and their possible causes.
High-level description of the terminal's functional blocks and data flow.
Explanation of the terminal's power supply circuits and voltage regulation.
Description of the video amplifier and sweep circuits that drive the CRT.
Details the vertical sweep generation and its relation to the CRT display.
Explanation of the horizontal sweep system and its control mechanisms.
Description of the high voltage generation for the CRT.
How video signals are processed and applied to the CRT cathode.
Overview of the character generator's function and screen mapping.
Description of the keyboard encoder, special characters, and repeat rate functions.
Explanation of the RAM, address counters, and cursor/scroll logic.
Details on how counter modes are controlled for different operations.
Procedures for erasing text to the end of line or the entire page.
How cursor movement is handled and displayed.
Explains specific cursor actions triggered by control characters.
Handles data rates faster than normal and screen data transmission.
Detects bell characters and explains the power-up reset sequence.
Cross-reference of circuit component numbers to Heath part numbers.
Specific ROM program data tables for IC724.
Instructions for requesting replacement parts from Heath.
Procedures for ordering parts directly from Heath Company.
Information on getting parts from local Heath Electronic Centers.
How to get technical help for assembly or operation issues.
Details on how to send the unit in for professional repair services.
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