Method to Maintain Vertical Registration on a Printer
Original Publication Date: 1985-Aug-01
Included in the Prior Art Database: 2005-Feb-19
A method is described to maintain vertical registration of a printer which has a fixed and vertical indexing increment which is not an even multiple of the line spacing desired. For example; the IBM Personal Computer printer or the IBM Personal Computer Graphics Printer has a vertical registration of 1/72 of an inch normally and 1/216 of an inch in graphics mode. When this printer is to support 5.3 lines per inch as well as superscripts and subscripts, the printer is physically incapable of responding since 5.3 lines per inch requires a line spacing of 13.5/72nds (or 40.5/216ths). The requirement for superscripts or subscripts means that a distance to be moved would be 6.75/72nds.