Sinclair ZX81
- Sinclair ZX81
 Sinclair ZX81 | |
- Overview
The Sinclair ZX81 is a home computer designed by Sinclair Research Ltd, released in March 1981. Known for its compact size and affordability, the ZX81 became one of the first computers to be widely adopted by the home market, particularly in the UK. It featured a minimalist design and was marketed as a low-cost entry point into computing.
- Technical Specifications
- **Processor**: Zilog Z80A - **Clock Speed**: 3.25 MHz - **Memory**:
- Base: 1 KB - Expandable: Up to 16 KB
- **Storage**:
- External: Audio cassette - Internal: None
- **Display**:
- Resolution: 64 × 192 pixels - Color: Monochrome (with optional color overlays)
- **Input**: Membrane keyboard - **Operating System**: Sinclair BASIC
- Features
The ZX81 was notable for its simple interface and programming capabilities. It came with Sinclair BASIC, allowing users to write and run their own programs. The ZX81's compact size and low price made it highly accessible to a wide audience, contributing to its popularity.
- Expansion Options
The ZX81 could be expanded with additional memory modules and peripherals, including:
- **RAM Packs**: To increase memory from 1 KB to 16 KB. - **Printer Interfaces**: For connecting to thermal printers. - **Video Outputs**: For connection to televisions and monitors.
- Legacy
The Sinclair ZX81 is often credited with helping to ignite the home computing revolution in the early 1980s. Its design philosophy and marketing approach influenced many subsequent home computers. It laid the groundwork for the Sinclair ZX Spectrum, which would further popularize home computing.
- Related Documents
Download the Sinclair ZX81 User Manual Here: sinclair_zx81_manual.pdf
Download the ZX81 Programming Guide Here: zx81_programming_guide.pdf
- Further Reading
- [Sinclair Research](https://en.wikipedia.org/wiki/Sinclair_Research) - [History of Home Computing](https://en.wikipedia.org/wiki/History_of_home_computing)