Eight palettes

Three day palettes and five night ones, all of them AA for every token that carries meaning. The switcher in the footer is a BASIC line, not a row of swatches, and the prompt accepts the real thing:

POKE 646,n is refused when the colour it asks for would put body text below 4.5:1 on the current screen — the machine answers ?ILLEGAL QUANTITY ERROR, which is the error it would really have used for a value out of range.