Noun
typeball (plural typeballs)
A ball in a typewriter or early printer that bears the physical characters on its surface and is moved mechanically in order to print them onto the page.
A programmer's view of the IBM 2741 keyboard layout with the APL typeball print head inserted Some APL symbols, even with the APL characters on the typeball, still had to be typed in by over-striking two existing typeball characters. Source: Internet
For devices utilizing replaceable components, such as a typeball element, any association may be restricted to a specific element, rather than to the typewriter as a whole. Source: Internet
The typeball moved laterally in front of the paper, instead of the previous designs using a platen-carrying carriage moving the paper across a stationary print position. Source: Internet
This was necessary because the APL character set was larger than the 88 characters allowed on the Selectric typeball. Source: Internet
This was used on paper printing terminal workstations using the Selectric typewriter and typeball mechanism, such as the IBM 1050 and IBM 2741 terminal. Source: Internet
Typewriter-derived printers typeball print element from IBM Selectric-type printer main Several different computer printers were simply computer-controllable versions of existing electric typewriters. Source: Internet