Contrast Control for a Resistive Ribbon Printer From a Personal Computer Keyboard
Original Publication Date: 1987-Jul-01
Included in the Prior Art Database: 2005-Feb-01
A personal computer (PC) may function as a typewriter by having a resistive ribbon printer, which is connected thereto, print on a sheet of paper in the printer as soon as each key of the PC keyboard is depressed. In such a system, it is necessary to have fine control over the print and erase currents for the electrodes of the printer. This is obtained with a five-way switch implemented in the PC software and activated from the PC keyboard. In a PC having a resistive ribbon printer connected thereto and used to print characters on a sheet of paper in the printer as soon as each key of the keyboard is depressed so that the apparatus functions as a typewriter, it is necessary to have an erase function in addition to a print function.