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General| Manufacturer | Radio Shack |
|---|---|
| Model | TRS-80 Model 4 |
| Category | Desktop |
| Release Year | 1983 |
| CPU | Zilog Z80 |
| CPU Speed | 4 MHz |
| Display | Monochrome CRT |
| Operating System | TRSDOS |
| Ports | RS-232 |
| Keyboard | Full-sized with numeric keypad |
| Power Supply | Internal |
| Storage | One or two 5.25" floppy disk drives (180 KB each) |
Details warranty terms, customer responsibilities, and limitations of liability for Radio Shack computer products.
Outlines the extent of Radio Shack's liability for damages arising from product use, including service limitations.
Explains fundamental TRSDOS operations, including file and device management concepts.
Provides a comprehensive guide to TRSDOS commands for system and file management.
Details the FORMAT command for preparing disks, setting parameters like name, density, and cylinders.
Explains the BACKUP utility for creating disk copies, including various parameters for file selection and backup types.
Introduces fundamental BASIC programming elements like programs, statements, expressions, and data handling.
Covers creating and accessing sequential and direct-access disk files within BASIC programs.
Details keyboard codes, modes, and special key functions for TRSDOS operation.
Outlines key technical specifications, including processor, memory, display modes, and interfaces.
Lists and explains TRSDOS operating system errors with troubleshooting steps.
Provides a comprehensive reference for BASIC error codes, messages, and their causes.
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