The Siclair Microvision, released in 1977, wasn't just a toy—it was a glimpse into the future of portable gaming. Nearly five decades before smartphones revolutionized how we play games on the go, this tiny device from Sinclair Research introduced the revolutionary concept of interchangeable LCD game cartridges. Though it disappeared from store shelves within a few years, the Microvision left an indelible mark on gaming history that continues to influence developers today.
The Birth of Portable LCD Gaming
The story of the Siclair Microvision begins with Sinclain Research, the British company better known for its groundbreaking ZX Spectrum computers. In the mid-1970s, handheld electronic games were gaining popularity, but most were single-game devices with fixed functionality. The Microvision changed everything by introducing a truly modular handheld console.
Conceived as a collaboration between Sinclair and toy manufacturer Milton Bradley, the Microvision featured a compact design measuring just 4.5 inches wide. Its most striking feature was the 16x16 pixel LCD screen—one of the smallest displays ever used in a consumer product at the time. Each game came as a separate cartridge that plugged into the top of the unit, containing both the game logic and the specific LCD segments needed for that particular game.
The system launched with five initial titles: Bowling, Pinball, Block Buster, Star Trek, and Hunt the Wumpus. Each cartridge used a unique LCD overlay design, making every game visually distinct despite sharing the same basic screen technology.
Technical Innovation and Limitations
The technical specifications of the Siclair Microvision were remarkable for their era but also revealed the constraints of early LCD technology. The system used custom-designed liquid crystal displays with segment-based graphics rather than a fully addressable pixel matrix. This meant game designers had to work within severe limitations, creating recognizable images from predefined LCD segments.
The processing power came from a single MOS 6507 microprocessor, a variant of the famous 6502 chip found in computers like the Apple II and Commodore 64. The device required four AA batteries, which provided approximately 20-30 hours of gameplay—a respectable runtime for the period.
Here's a simplified example of how game logic might have been implemented on such a system:
```c
// Simplified Microvision game loop structure
#include typedef struct {
int score;
int lives;
int player_x;
int player_y;
} GameState;
void update_game(GameState *state) {
// Update player position based on input
if (check_button_press(UP_BUTTON)) {
state->player_y = (state->player_y - 1 + GRID_HEIGHT) % GRID_HEIGHT;
}
// Check collisions and update score
if (check_collision(state)) {
state->score += 10;
}
}
void render_display(GameState *state) {
// Clear LCD segments
clear_lcd_segments();
// Draw player at current position
draw_lcd_segment(state->player_x, state->player_y, PLAYER_SEG