programming the 6845 - a BASIC description of the CRTC registers

programming the 6845 elektor october 1984 Computers do not always have to perform difficult tasks to be useful. Very often it is the boring, repetitive, soul-destroying type of work we make them carry out. Calculating the hexadecimal values of the registers in the 6845 (or 6545) cathode ray tube controller (CRTC) for any given screen format could hardly be called mind-taxing but it is the sort of job that any computer, using this BASIC program, will perform correctly and as often as you like. programming the 6845 a BASIC description of the CRTC registers R Fransen The value of changing the screen format on your Elektor VDU card (or any other VDU card that uses a 6845 or 6545 CRTC) may not be immediately obvious but once hooked on the technique it is something you are likely to do more and more often. Furthermore this program is interesting and instructive in its own right. The parameters The 6845, and all the various details about structure, organisation of the screen for- mat and...