O16-DPT9 rev A

* 0520-001-H002 (O16-DPT9) DRAWING NO. 41285751-001-01 PAGE 6

0251 * EAST FOR A DISTANCE OF ONE HUNDRED AND TWENTY UNITS. 0252 * SUCH THAT THE DOTS AND SPACES ARE EACH ONE UNIT LENGTH. 0253 * THIS IS REPEATED IN ALTERNATE DIRECTIONS WITH 0254 * ALTERNATING DOTS AND SPACES ON EACH LINE. THE LINE 0255 * SEPARATION IS ONE UNIT. 0256 * 0257 * EIGHT EINES ARE PLOTTED WITHOUT INTERRUPT CONTROL. 0258 * 0259 * 2 INCREMENT AND SPEED TEST - SQUARE SPIRAL 0260 * ---------------------------------------- 0261 * THIS TEST CONSISTS OF A DIVERGENT SQUARE SPIRAL DRAWN 0262 * IN AN ANTI-CLOCKWISE DIRECTION, COMMENCING AT ONE UNIT 0263 * LENGTH NORTH TO SOUTH AND ENDING AT TWENTY UNIT LENGTHS 0264 * EAST TO WEST, THE INCREMENT EMPLOYED BEING ONE UNIT. 0265 * THE FIGURE IS TIMED AND THE SPEED (NUMBER OF MEMORY 0266 * CYCLES PER INCREMENT) IS TYPED OUT FOR EACH FIGURE 0267 * IF SENSE SWITCH 4 IS OFF. 0268 * 0269 * FOUR FIGURES ARE PLOTTED IN A ROW SEPARATED BY TEN 0270 * UNITS. TWO ROWS ARE DRAWN (ROW SEPARATION BEING TEN 0271 * UNITS), AND INTERRUPT CONTROL IS USED ONLY WHILE 0272 * PLOTTING THE SPIRALS. 0273 * 0274 * 3 FULL DIRECTIONAL TEST - SIXTEEN POINTED STAR 0275 * -------------------------------------------- 0276 * THIS TEST CONSISTS OF A SIXTEEN POINTED SYMMETRICAL 0277 * STAR OCCUPYING A CIRCULAR AREA OF TWENTY UNIT DIAMETER. 0278 * ALL EIGHT HARDWARE DIRECTIONS ARE EMPLOYED. AND EIGHT 0279 * SOFTWARE-COMPUTED DIRECTIONS. THE TEST CHECKS FOR 0280 * EQUAL PRECISION IN THE MAJOR AND MINOR PLOTTING 0281 * DIRECTIONS. AND A NON-COINCIDENCE OF THE CENTRE 0282 * OF THE FIGURE 0283 * 0284 * THREE FIGURES ARE PLOTTED IN A ROW SEPARATED RY TWENTY 0285 * UNITS, THREE ROWS ARE DRAWN (ROW SEPARATION BEING TEN 0286 * UNITS), AND INTERRUPT CONTROL IS USED THROUGHOUT. 0287 * 0288 * 4 ALIGNMENT TEST - DIAMOND MESH 0289 * ----------------------------- 0290 * THIS TEST DRAWS A COMPLEX FIGURE CONSISTING OF SIX 0291 * DIAMONDS DRAWN BETWEEN HORIZONTAL PARALLEL LINES. THE 0292 * DIAMOND DIAGONALS ARE ALSO DRAWN. THE PATTERN IS 0293 * CONTINUOUS AND THE HEIGHT AND WIDTH OF EACH DIAMOND IS 0294 * TWENTY UNITS. THE TEST DEMONSTRATES THE HORIZONTAL 0295 * AND VERTICAL ALIGNMENT OF THE PLOTTER. THE HORIZONTAL 0296 * LINES SHOULD INTERSECT EACH DIAMOND APEX, AND THE 0297 * VERTICAL DIAGONALS OF THE ENTIRE FIGURE SHOULD 0298 * INTERSECT THE DIAMOND APICES AND EACH SHOULD FORM A 0299 * CONTINUOUS STRAIGHT LINE OVER THE WHOLE FIGURE. 0300 *