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I wrote yesterday that the ZX81 has a native graphics resolution of 64x48. That's not strictly true. It has a pixel resolution of 256x192, but has a character map of 32x24. The PLOT routines use the graphics block characters as pseudo-pixels to effect a resolution of 64x48.

To confuse matters more, there are a handful of techniques to force it to do hires graphics, and there are a handful of games that do just that, including an incredible port of Manic Miner.

Oh and the character map, also known as D_FILE. You'd think that this is a 32x24 array in a static position in the memory map. Ha! Gotcha!!

Well, that's different!