Byte - January 1976 by Virginia Williamson

By Virginia Williamson

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A procedure, called MOVECU RS is executed first to decode the four low order bits of the graphics control form at and adjust the cursor position. MOVECURS is specifi ed in a procedureoriented lan guage in figure 4. This routine contains four IF statements which test the four motion control bits. Motion is ac hiev ed for each logical one bit by simply adding or subtracting o ne from the corresponding cursor position variable XCOL or YROW. Note that this software takes care of an invalid combination of up and down (or left and right) in a unique way : nothing happe ns .

Nd and LED display mask. I n addit ion to standard li ghts and switches, the heavy duty front panel has an extra 8 program controlled LcD's. o Rugged commercial grade paddl e switches backed up by reliable debouncing circuits. o Gold plated contacts on board edge connectors to assure co rrosi on free contact at a ll locations. o A heavy duty power supply to handle lots of extra cards, the power supply delivers up to 24 amperes at 8 volts, and 3 amps eac h at +16 and -16 volts. o A sturdy card cage to properly support up to 22 p rinted circuit boards.

Commercial Grade-up to 35° C . These units are factory fresh, full spec devices. COMPUTER GRADE REGULATED POWER SUPPLIES All units are short-circuit proof , fold back current limited and with over-voltage crowbar protection . 50 MICRO COMPUTER SUPPLY COMBINATIONS TTL INTEGRATED CIRCUITS For the 8008 MD-0 8-+5 volt at 6 amp , -12 , -9 at 200 ma . . . . ... . ... ... $75. 00 Forthe 8080 MD-80-+5 volt at6 amp , ±12v at 200 ma ... 00 For the Fairchild F-8 MD-8-+ 5 vo lt at6 amp, +12 v at 200 m a ...

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