>Anyway, we experimented with different matrix sizes and discovered that a
>5x7 matrix seemed
>to fit all letters (upper case only) pretty well so that's what we used.

It also allows you to do a reasonable representation of most lower case, and
sort of allows descenders on g, j, p, q and y, enough to make them
discernable for what they should be.

To get properly decent looking characters you need a 9x7 matrix for proper
descenders, and Motorola used to make a very nice ROM which had a 9x7 matrix
mapped into a 9x16 space, giving excellent descenders, without requiring the
full 9x16 space in the rom, it required a 9x7 plus 1 bit per char to signify
it was shifted for the descender.

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