Play Meter

reference. See See Figure Figure Three Three for for reference. do II get getwire wire wrap wrap stuff? stuff? Where do Where For pre-cut/ stripped wires tool For pre-cut/stripped wires,, tool and sockets sockets try try Page Page Digital Digital and Electronics, 135 135 E. E. Chestnut Chestnut St. St. #5, #5, Electronics, Monrovia, CA 91016, (213-357Monrovia, CA 91016, (213-3575005) . You You should should be be able able to to get get aa 5005). wire wrap wrap tool, tool, IC IC sockets, sockets, and and wire enough pre-cut wires to stage a half enough pre-cut wires to stage a half dozen projects like this for less than dozen projects like this for less than twenty bucks. bucks. twenty - EDITOR'S NOTE: NOTE : For For another another EDITOR'S article on on Atari Atari steering steering boards, boards, article check Randy Fromm's contribution check Randy Fromm's contribution the July July 22, 22, 1977 1977 issue issue of of PLAY PLAY inin the METER's Update. Update. METER's STEERA TC 3 10 D Q TC 2 74 2 14 8 IK IK 13 0 p P P LD 11 LD12 m 2 3 4 5 D IC2 74 CQ JO 15 OIC3 3 2 00 4 6 IC3 5 4 4 1 7 STEERB 4 TC 14 10 0 D C 14 IC 44 IC 6 50 00 1I B CC /~? 192 CD aA. QB QB GC. GD QA QC QD 2 3 6 7 3 1. " 7 4 0 +5 VOLTS 5 220 16V + TO +5V POWER SUPPLY I S" 1"1 13 12 1'2 13 14 15 A B C. t:: A B C D IC 5 5 42 42 IC :~ 16 O1l 2 0 2 I 'l ~ 2 3 1 GROUND LD• LDI LDZ LD3 L~ LD4 "3"4 3 4 4 4 51J 5'G. 5 6 UX.. LDG ll:5 LD5 ~ 6 8 8 t8 " 8 9 7 7 7 '} 9 10 10 I / 1 !..b1 lb S L.D" LblO LD7 LD8 LD9 LDIO W ~:;1'~1--~ 1'.;- Figure 4 4 Figure 0000000000 O O 0 0 0 o0 o 0°0 0 0 0 0~ ~ DODOO Figure 5 5 Figure - This steering steering board board test test fixture fixture This employs the the same same input input steering steering employs circuit as as found found on on Atari Atari games. games. IC1, ICl, circuit 7414 shapes shapes the the steering steering pulses pulses so so 7414 that the the next next circuit circuit IC2 IC2 can can read read that them. them. LD11 and and LD12 LD12 LEDS LEDS are are there there LD11 so that that we we can can figure figure out out which which so side/ circuitof ofthe the steering steering board board hurt hurt side/circuit itself by by breaking breaking the the individual individual light light itself sources one one at at aa time. time. LD11 LD11 and and 12 12 sources are off off when when light light source source isis not not are broken. broken. IC2 7474 74 74 inputs inputs 22 and and 33 IC2 determine direction direction of of turning, turning, Steer Steer determine A before before Steer Steer BB or or Steer Steer BB before before A Steer A. A. Steer IC2 7474 7474 inputs inputs 11 11 and and 12 12 IC2 determine steerin steerin y1rate. rate . One-half One-half the the determine clock rate rate developed devei:.lped by by Steer Steer A. A. clock IC3 7400 7400 gares gates the the rate rate pulses pulses IC3 with the the steering steering direction direction informainformawith tion which which clocks clocks IC4 IC4 74192 74192 BCD BCD tion up/down counter. counter. up/down IC4 BCD BCD information information isis decoded decoded IC4 into decimal decimal information information by by IC5 IC5 into 7442 and andisis displayed displayed by by LEDS LEDS LD1 LDl 7442 thru LD10. LDlO. thru LEDS LD1 LDl thru thru LD10 LDlO will will be be lit lit LEDS one at a time. By turning Chopper one at a time. By turning Chopper Wheel inin one one direction, direction, lit lit LED LED will will Wheel sequence from fro m right right to to left. left. Turn Turn sequence wheel in in opposite opposite direction direction and and lit lit wheel LED will will sequence sequence from from left left to to right. right. LED 12 IC How ititworks works How direction change change of of Chopper Chopper Wheel. Wheel. direction How to to use use How To insure insure reliability, reliability , electronic electronic To testing should be done under testing should be done under worst-case conditions. conditions. Adjust Adjust fixfixworst-case ture's 5VDC 5VDC source source to to about about 4.75V. 4 . 75V. ture's Board voltages voltages tend tend to to be be aa little little low low Board more often than high . more often than high. Plug board board into into fixture fixture connector connector Plug out and away from Chopper. LEDS out and away from Chopper. LEDS 11 and and 12 12 should should both both be be out. out. Break Break 11 light sources individually and watch light sources individually and watch LEDS LD11 LD11 and and LD12 LD12 light light LEDS individually . individually. Next, position position steering steering board board over over Next, nails and bring down Chopper. Turn nails and bring down Chopper. Turn Chopper rapidly rapidly through through steering steering Chopper board back back and and forth forth lit lit LED LED board sequencing should should track track directly directly with with sequencing 0 mounting detail. detail. You You can can wire-wrap wire-wrap mounting the round round resistor resistor and and capacitor capacitor the leads; however, wire-wrapping was leads; however, wire-wrapping was meantto to be be done done on on square square posts, posts, so so meant apply a light solder job to all round apply a light solder job to all round posts wrapp wrapped. ed. posts 10. Using Logic Logic Diagram Diagram Figure Figure 10. Using Four, wire up vector board and small small and board vector up wire Four, harness with connector. harness with connector. 11 . Mount Mount strap strap hinge hinge to to board board as as 11. shown in Figure One. shown in Figure One. 12. Assemble Assemble chopper chopper assembly assembly 12. to end of strap hinge Figure One. to end of strap hinge Figure One. 13. Steering Steering Chopper Chopper should should clear clear 13. board by about 3/8 inches and board by about 3/8 inches and should be be exactly exactly parallel parallel to to board. board. should Mount rubber rubber feet feet end end to to end end near near Mount hinge and and bend bend strap strap slightly slightly to to hinge accomplish this . accomplish this. 14. Lay Lay steering steering board board on on board board 14. so that Chopper Wheel passes SO that Chopper Wheel passes through itit and and turns turns freely. freely. Mark Mark on on through board where steering board mountboard where steering board mounting holes holes are are located located (Two (Two holes holes in in ing black plastic that screws pass through black plastic that screws pass through to steering steering adgitator). adgitator). Drill Drill pilot pilot holes holes to and tap in two 4d finishing nails with and tap in two 4d finishing nails with heads cut off. These nails will hold heads cut off. These nails will hold steering board board so so that that Chopper Chopper steering Wheel turns turns true. true . Wheel 15. Assemble Assemble completely completely wired wired 15. vector board into wooden frame and vector board into wooden frame and screw together. screw together. 16. Connect Connect to to +5v + 5v power power 16. supply, plug plug in in steering steering board board and and supply, have fun. fun . · have 1