Abstract
We are using an Intel 8080 microprocessor to control the movement of a mechanical measuring stage. It is a component of a computer-controlled half-automatic measuring device called HEVAS. The tasks of the microprocessor are: • controlling the velocity of the measuring stage, • steering of the stage according to the input by a track ball, • positioning of the stage, • circular movement. The program needs 2 Kbyte of PROM and about 250 byte of RAM. It consists of a foreground (velocity control) task and a background task (the others). Calculations are done with a mixed 8 and 16-bit arithmetic. The program has been written mainly in PL/M but time-critical parts are in assembler language.
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