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Step-by-step instructions for opening the device's upper case using tweezers.
Illustrates component interconnections between CPUs, RAM, display, and keyboard.
Details the main CPU, sub CPU, gate array, and RAM integrated circuits.
Visual representation of RAM organization and address allocation.
Explains buzzer control, interrupt handling, and keyboard interface circuits.
Lists and defines the various voltage supply lines (VSS1, VRAM, VDD1, VDD2).
Provides detailed pin assignments and functions for key ICs like HD61747B20 and MB64H193.
Explains the dot-matrix LCD structure and how characters are formed.
Addresses issues like no display, partial display, calculation errors, and button malfunctions.
Instructions for running diagnostic programs for memory and printer.
Procedures for saving programs to cassette tape and loading them back.
Details the system setup and sample output for printer verification.
Details specific key presses and their immediate results.
Visual representation of the printed circuit board's top layer.
Lists capacitors, ICs, and resistors with their specifications and part numbers.
Lists various mechanical parts, connectors, seals, and cases with part numbers.
Step-by-step guide for taking apart the device, referencing numbered parts.
Detailed circuit diagram of the main functional blocks of the computer.
Illustrates the normal and shifted functions of each key.
Shows the mapping of display segments and their control signals.
General| Display | LCD |
|---|---|
| Type | Scientific |
| Power Source | Battery |
| Functions | Scientific |
| Weight | 85 g |
| Battery | 2 x LR44 (G13) button cells |
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