Retro Programming

Recently I issued the third Z80 programming challenge for the ZX Spectrum: This time the challenge is to write the shortest code to displa...

Last week I issued the second Z80 programming challenge: Something slightly more complex this time. Write the shortest code to mirror the ...

A few days ago I issued a Z80 programming challenge for the ZX Spectrum: Something simple for the first challenge. Write the shortest code...

The Mandelbrot set is a fractal which iterates the equation z n+1 = z n ² + c in the complex plane and plots which points tend to infin...

In May 1984 A K Dewdney introduced Core War, a game played between two or more computer programs in the memory of a virtual computer. The a...

For years I've been using the following simple code to reverse the bits in the A register by rotating the bits left out of one register ...

The Centre for Computing History is a short walk from Cambridge city centre and is home to a sizeable collection of computers. The museum...