Sinclair ZX81
| Specifications | |
|---|---|
| Manufacturer | |
| Type | |
| CPU | |
| Memory | |
| Storage | |
| Display | |
| Sound | |
| OS / Firmware | |
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Sinclair ZX81
| Specifications | |
|---|---|
| Manufacturer | Sinclair Research |
| Type | Home computer |
| Released | March 1981 |
| Discontinued | 1984 |
| Intro price | £69.95 |
| CPU | Zilog Z80A |
| Memory | 1 KB (expandable to 16 KB) |
| Storage | Cassette tape |
| Display | 32 x 24 characters (monochrome) |
| Sound | None |
| Dimensions | 23 x 14 x 4 cm |
| Weight | 1.5 kg |
| OS / Firmware | Sinclair BASIC |
| Predecessor | Sinclair ZX80 |
| Successor | Sinclair ZX Spectrum |
🧠 Architecture
Video generation
💾 Storage
🔌 I/O and Expansion
🔧 Known PCB Revisions & Errata
🛠️ General Maintenance
📜 Schematic & PCB
🔧 Common Modifications
🔢 ROM Keyword Map
🔗 Edge-Connector Pin-out
🗺️ Exact Memory Map & Key ROM Entry Points
Popular ROM Vectors (ROM v1.2, 1980)
📺 Video Timing Characteristics
🎬 Trivia / Pop-culture
🗂️ Related Pages
🧠 Architecture and Processor
💾 Memory and Storage
🖥️ Display and Graphics
🔊 Sound Capabilities
🎮 Input/Output and Expansion
🧰 General Maintenance
🧾 PCB Schematics & Service Guide
📷 Motherboard Images
📚 Technical Documentation
📷 Gallery
🧪 Related Pages
General Maintenance
PCB Schematics & Service Manual
Apple Service Manual
Logic Board & Analog Board Schematics
Capacitor Replacement Guide
Retrobrite
Troubleshooting
Technical Details
System Architecture at a Glance
Memory Map (Physical)
ROM Layout (256 KB, v5.0)
ADB & PDS Highlights
Floppy / Mass-Storage
Key I/O ICs
Sound Path
RAM Upgrade Notes
Hardware Easter Egg
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