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zx81 programming | The Financial Standard

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A close-up of a vintage Sinclair ZX81 microcomputer keyboard with a monochrome screen displaying a text-based chess board, illustrating the ZX81 1K Chess Code.

Stunning: ZX81 1K Chess Code Revealed

A stunning analysis reveals the ingenious tricks behind the ZX81 1K Chess Code, packing a full chess engine into just 1K…

James Whitfield·April 3, 2026, 7:01 PM

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