Analysis of information sources in references of the Wikipedia article "Diablo 630" in English language version.
In the horizontal direction, the Diablo (and others) is capable of moving the printhead 1/120 of an inch at a time [...] In the vertical direction the Diablo can move the print mechanism in increments of 1/48 of an inch. Thus, the maximum density of information you can print using a Diablo 630 is 120 X 48 in a square inch.
The API/ECS Model 630 ... can operate with Diablo's ECS print wheels which can contain two characters per spoke, or up to 192 characters per print wheel. The model 630 ECS/IBM operates with Diablo's specially designed ECS IBM print wheel for the IBM PC character set, as well as all of the 88-, 92- and 96-character print wheels.
The minimum possible increment of horizontal movement is 1/120... The minimum possible increment of vertical movement is 1/48."
