[ParrotyError]

When I was in my teens I bough a book called "Advanced Spectrum Machine Language" by David Webb (IIRC) and it had examples of a rainbow processor (high-res colour by repeatedly writing to the attributes file quickly) and a full-screen horizon (by flipping the border colour bit at the right time). I've often wondered what other tricks were possible. For example, would it be possible to mix colours by changing the attributes on successive frames? So you could, for example, make orange by mixing red and yellow?

[Joeboy]

I had that book! Programming books were generally out of my budget back then, but I saved up for that one, which I recall being full of incredibly clever tricks. I wonder if this is the same David Webb - I guess it probably is: https://en.wikipedia.org/wiki/David_Webb_%28Hong_Kong_activi...

I think switching between colours at 25hz would give you pretty horrible flicker, although maybe we would have forgiven that in the Spectrum era.