O16-DPT9 rev B

* 0520-001-H002 (O16-DPT9) DRAWING NO. 41285751-001-02 PAGE 6

0251 * ALL PATTERNS ARE PLOTTED FROM THE LEFT HAND SIDE AND A GAP OF 0252 * THIRTY UNIT LENGTHS IS KEPT IN BETWEEN THE PATTERNS 0253 * 0254 * 1 PEN MOVEMENT TEST - DOTTED LINE 0255 * ------------------------------- 0256 * THIS TEST CONSISTS OF A DOTTED LINE DRAWN FROM WEST TO 0257 * EAST FOR A DISTANCE OF ONE HUNDRED AND TWENTY UNITS. 0258 * SUCH THAT THE DOTS AND SPACES ARE EACH ONE UNIT LENGTH. 0259 * THIS IS REPEATED IN ALTERNATE DIRECTIONS WITH 0260 * ALTERNATING DOTS AND SPACES ON EACH LINE. THE LINE 0261 * SEPARATION IS ONE UNIT. 0262 * 0263 * EIGHT EINES ARE PLOTTED WITHOUT INTERRUPT CONTROL. 0264 * 0265 * 2 INCREMENT AND SPEED TEST - SQUARE SPIRAL 0266 * ---------------------------------------- 0267 * THIS TEST CONSISTS OF A DIVERGENT SQUARE SPIRAL DRAWN 0268 * IN AN ANTI-CLOCKWISE DIRECTION, COMMENCING AT ONE UNIT 0269 * LENGTH NORTH TO SOUTH AND ENDING AT TWENTY UNIT LENGTHS 0270 * EAST TO WEST, THE INCREMENT EMPLOYED BEING ONE UNIT. 0271 * THE FIGURE IS TIMED AND THE SPEED (NUMBER OF MEMORY 0272 * CYCLES PER INCREMENT) IS TYPED OUT FOR EACH FIGURE 0273 * IF SENSE SWITCH 4 IS OFF. 0274 * 0275 * FOUR FIGURES ARE PLOTTED IN A ROW SEPARATED BY TEN 0276 * UNITS. TWO ROWS ARE DRAWN (ROW SEPARATION BEING TEN 0277 * UNITS), AND INTERRUPT CONTROL IS USED ONLY WHILE 0278 * PLOTTING THE SPIRALS. 0279 * 0280 * 3 FULL DIRECTIONAL TEST - SIXTEEN POINTED STAR 0281 * -------------------------------------------- 0282 * THIS TEST CONSISTS OF A SIXTEEN POINTED SYMMETRICAL 0283 * STAR OCCUPYING A CIRCULAR AREA OF TWENTY UNIT DIAMETER. 0284 * ALL EIGHT HARDWARE DIRECTIONS ARE EMPLOYED. AND EIGHT 0285 * SOFTWARE-COMPUTED DIRECTIONS. THE TEST CHECKS FOR 0286 * EQUAL PRECISION IN THE MAJOR AND MINOR PLOTTING 0287 * DIRECTIONS. AND A NON-COINCIDENCE OF THE CENTRE 0288 * OF THE FIGURE 0289 * 0290 * THREE FIGURES ARE PLOTTED IN A ROW SEPARATED RY TWENTY 0291 * UNITS, THREE ROWS ARE DRAWN (ROW SEPARATION BEING TEN 0292 * UNITS), AND INTERRUPT CONTROL IS USED THROUGHOUT. 0293 * 0294 * 4 ALIGNMENT TEST - DIAMOND MESH 0295 * ----------------------------- 0296 * THIS TEST DRAWS A COMPLEX FIGURE CONSISTING OF SIX 0297 * DIAMONDS DRAWN BETWEEN HORIZONTAL PARALLEL LINES. THE 0298 * DIAMOND DIAGONALS ARE ALSO DRAWN. THE PATTERN IS 0299 * CONTINUOUS AND THE HEIGHT AND WIDTH OF EACH DIAMOND IS 0300 * TWENTY UNITS. THE TEST DEMONSTRATES THE HORIZONTAL