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The font on the page is definitely too wide -- it should be taller than wide, and 10 characters per inch.

I'm not sure the original MX-80 had square dots. Since they made this to be pixel accurate, the aspect ratio might be off because the MX-80 was off.

The key test is not how it looks on screen, but how it looks printed.

My recollection is that the dots were round on my dot matrix. But it also used a typewriter ribbon, so there was a bit of texture from that.

Good point, the dots were produced by pins that were round. What I meant to say was that the spacing might have been different in the two directions.

Yes, I’m sure they would be. Especially since the same font would have been used for normal width (10 characters per inch) and compressed (17 cpi).