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The Diablo printer was the first low-cost device capable of producing typewriter-quality output. It had a daisy-wheel print mechanism capable of proportional spacing, superscripts and subscripts, and overstriking. It had a set of symbols for line drawing plus the ability to position the character anywhere on the page so it was able to draw diagrams as well. You had to be a bit careful as, without pin-registered rollers, the paper tended to move a bit so there was an art in getting graphics produced of reasonable quality.
Horizontal placement could be controlled in increments of of 1/120in and vertical placement is controllable in increments of 1/48in. Thus creating diagrams was not that easy. Bob Hopgood wrote a GINO-F backend so that graphical output to the Tektronix displays could also be printed on the Diablo.
With a system like RUNOFF on the Prime it was possible to generate all the documentation you needed of a quality that was acceptable to a publisher or printer.
Diablo 1620 Documentation Printer and Texas 820 Fast Serial Printer
Both the Texas and Tally printer companies are still in operation and it is possible to purchase consumables and spare parts for the Texas 820 in 2005.