daisywheel typewriter printer interface - an inexpensive high quality computer printer

daisywheel typewriter printer interface elektor June 1984 an inexpensive high quality computer printer Sooner or later every serious computer user feels the need for a printer. A look at the price and a quick check of the bank balance generally causes a state of gloom to set in with a lot of programming time being spent humming verses of Blaise Pascal"s not-so-well- known ode "Oh, for a little printer". Now, however, there is a cure for this condition. Most electronic typewriters have a keyboard laid out as a matrix which is controlled by means of software. All that is needed, then, is to tap into the output of the matrix and feed in the codes for the characters to be printed and the machine will recognize them just as if the same key has been pressed. The best part of all is that this does not even require any drastic modifications to the existing circuit. daisywheel typewriter printer interface Table 1. An example of how the eight lowest ad- dress lines of EPROM IC1 are encoded....