╔NPUT DRIVERS AND PLANS FOR BUILDING A MULTIPLEXER FOR THE ┴TARI ├╪80 ╘RAK-┬ALL. ╘HIS PACKAGE IS DISTRIBUTED AS SHAREWARE, PLEASE SEND $5.00 TO ─AVID ╟UNDERSON, 618 ┼AST 2ND ╙T. ┴PT 3, ╙UPERIOR, ╬┼ 68978-1904
─┼╙├╥╔╨╘╔╧╬ ╧╞ ╞╔╠┼╙
─┼═╧ 1.0 IS A ┬┴╙╔├ PROGRAM THAT POKES A MACHINE LANGUAGE TRACKBALL DRIVER INTO MEMORY. ╔T CAN BE LOCATED ANYWHERE IN MEMORY WHERE THERE ARE 103 BYTES FREE BY CHANGING THE VALUE OF ╙ IN LINE 10. ╘HE TRACKBALL MUST BE IN TRACKBALL MODE TO PROPERLY MOVE THE POINTER. ─UE TO KEYBOARD INCOMPATABILITY IT MUST IN JOYSTICK MODE TO TYPE, AND IN TRACKBALL MODE TO MOVE THE POINTER. ╘HIS PROGRAM DOES NOT USE THE MULTIPLEXER.
─┼═╧ 2.0 IS A ┬┴╙╔├ PROGRAM THAT POKES A MACHINE LANGUAGE TRACKBALL DRIVER THAT USES THE MULTIPLEXER. ╔T CAN BE LOCATED ANYWHERE IN MEMORY WHERE THERE ARE 163 BYTES FREE BY CHANGING THE VALUE OF ╙ IN LINE 10. ╘HE TRACKBALL MUST BE IN TRACKBALL MODE, AND THE ADAPTOR MUST BE INSTALLED TO USE THIS PROGRAM.
╘╥┴├╦┬┴╠╠ 1.0 IS A ╟┼╧╙ INPUT DRIVER FOR THE TRACKBALL. ╒SE ├╧╬╓┼╥╘ ╓2.5 TO CONVERT IT TO ╟┼╧╙ FORMAT. ─UE TO KEYBOARD INCONPATABILITY YOU MUST SWITCH TO JOYSTICK MODE TO TYPE, AND TO TRACKBALL MODE TO MOVE THE POINTER WITH ╘╥┴├╦┬┴╠╠ 1.0 INSTALLED. ┘OU CAN CHANGE THE SPEED OF THE POINTER BY CHANGING THE MINIMUM VELOCITY USING THE PREFERENCE MANAGER.
╘╥┴├╦┬┴╠╠ 2.0 IS A ╟┼╧╙ INPUT DRIVER FOR THE TRACKBALL THAT OVERCOMES THE HARDWARE INCOMPATABILITY PROBLEM BY USING THE MULTIPLEXER. ╒SE ├╧╬╓┼╥╘ ╓2.5 TO CONVERT IT TO ╟┼╧╙ FORMAT. ╘HE TRACKBALL MUST BE IN TRACKBALL MODE AND THE MULTIPLEXER MUST BE INASALLED TO WORK PROPERLY WITH ╘╥┴├╦┬┴╠╠ 2.0 INSTALLED. ┘OU CAN CHANGE THE SPEED OF THE POINTER BY CHANGING THE MINIMUM VELOCITY USING THE PREFERENCE MANAGER.
╘╥┴├╦┬┴╠╠.─╧├ IS THIS FILE.
═╒╠╘╔╨╠┼╪.╙├╚┼═ IS A GEO╨AINT FILE WITH SCHEMATICS AND DIAGRAMS FOR MAKING THE MULTIPLEXER. ╒SE ├╧╬╓┼╥╘ ╓2.5 TO CONVERT IT TO ╟┼╧╙ FORMAT.
═┴╦╔╬╟ ╘╚┼ ┴─┴╨╘╧╥
├┴╒╘╔╧╬: ┘OU SHOULD HAVE A KNOWLEDGE OF BASIC ELECTRONICS AND SOLDERING BEFORE ATTEMPTING TO MAKE THE MULTIPLEXER. ╔MPROPER WIRING COULD DAMAGE YOUR COMPUTER AND/OR TRACKBALL. ╘HE AUTHOR WILL NOT BE HELD RESPONSIBLE FOR ANY DAMAGE TO YOUR EQUIPMENT.
1. ├UT THE ╨├ BOARD INTO A 1IN. X 5/8IN. RECTANGLE SO THAT THERE IS A 6X10 GRID OF HOLES. (SEE MULTIPLEX.SCHEM)
2. ╙OLDER THE 74╠╙151 ╔├ INTO THE CENTER OF THE CIRCUIT BOARD WITH THE NOTCH POINTING TOWARD THE MALE CONNECTOR. (SEE MULTIPLEX.SCHEM)
3. ╙OLDER RESISTOR ╥1 FROM PIN 5 OF ╔├1 TO THE CORNER OF THE ╨├ BOARD NEXT TO THE FEMALE CONNECTOR. (SEE MULTIPLEX.SCHEM)
4. ╙OLDER A WIRE FROM ╥1 TO PIN 1 OF THE FEMALE CONNECTOR. (SEE MUTIPLEX.SCHEM)
5. ╙OLDER THE REST OF THE WIRES IN ACCORDING THE FOLLOWING CHARTS.
╔├1 ╨IN TO ├╬1 ╞EMALE ╨IN
-------------------------
7 8
8 8
9 4
10 3
11 2
16 7
╔├1 ╨IN TO ├╬2 ═ALE ╨IN
------------------------
2 3
3 2
4 1
7 8
8 8
15 4
16 7
6. ╙OLDER A WIRE FROM PIN 6 OF THE FEMALE CONNECTOR TO PIN 6 OF THE MALE CONNECTOR.
7. ─OUBBLE CHECK WIRING AND CHECK FOR SOLDER BRIDGES, COLD SOLDER JOINTS, ECT.
8. ╙NAP THE CUSTOM ADAPTOR HOUSING AROUND THE COMPLETED MULTIPLEXER.
9. ╔NSERT THE TRACKBALL CORD INTO THE MALE END OF THE MULTIPLEXER, AND THE FEMALE END OF THE MULTIPLEXER INTO CONTROL PORT 1.
╘HE ┴TARI ├╪80 TRAK-BALL CAN BE PURCHASED AT THE ├OMPUTER ┬ARGAIN ╙TORE, PHONE NO. (801) 466-8084.
╘╚┼╧╥┘ ╧╞ ╧╨┼╥┴╘╔╧╬
╫HEN THE TRACKBALL IS ROTATED HORRIZONTALLY IT CAUSES PIN 2 TO TOGGLE. ╫HEN IT IS ROTATED TO THE LEFT, IT CAUSES PIN 1 TO GO LOW, WHEN IT IS ROTATED TO THE RIGHT IT CAUSES PIN 1 GO HIGH. ╫HEN THE TRACKBALL IS ROTATED VERTICALLY IT CAUSES PIN 4 TO TOGGLE. ╫HEN IT IS ROTATED UP, IT CAUSES PIN 3 TO GO LOW, WHEN IT IS ROTATED DOWN, IT CAUSES PIN 3 TO GO HIGH.
╘HE KEYBOARD AND THE CONTROL PORTS ARE CONNECTED, SO IF ANY OF THE PINS ARE LOW WHILE THE KEYBOARD IS BEING SCANNED, IT WILL BE FALSELY INTERPRETED AS A KEYPRESS. ╘HE MULTIPLEXER AVOIDS THIS PROBLEM BY NOT READING THE TRACKBALL WHILE THE KEYSCAN IS TAKING PLACE.
╨INS 2,3 AND 4 OF CONTROL PORT 1 ARE SET AS OUTPUTS AND ARE CONNECTED TO INPUT SELECTS ┴,┬ AND ├ RESPECTIVELY. ╨IN 1 IS SET AS AN INPUT AND IS CONNECTED TO THE OUTPUT OF ╔├1. ╨IN 6 IS SET AS AN INPUT AND IS USED TO READ THE BUTTON IN THE SAME WAY AS IT WOULD BE READ FROM A JOYSTICK. ╘HE MULTIPLEXER IS WIRED SO THAT WHEN LESS THAN 2 OF THE INPUT SELECT PINS ON ╔├1 ARE LOW, IT SELECTS AN UNUSED INPUT, THIS CUSES THE ╔├'S OUTPUT TO GO HIGH. ╘HIS IS BECAUSE WHEN A KEY IS PRESSED IT CAN CAUSE ONE OF THE OUTPUTS ON THE CONTROL PORT TO GO LOW, IF THIS WERE TO SELECT AN INPUT ON ╔├1 THAT WAS LOW, IT WOULD PULL PIN 1 OF THE CONTROL PORT LOW, THIS WOULD INTERFERE WITH THE KEYSCAN. ╫HEN THE KEYBOARD IS NOT BEING SCANNED, THE INPUT DRIVER PROGRAMS SEND CODES TO THE INPUT SELECT PINS THAT SELECT INPUT FROM PINS 1 THROUGH 4 ON ├╬2 IN ORDER, THESE INPUTS ARE READ SERIALLY THROUGH PIN 1 OF CONTROL PORT 1. ╘HIS INFORMATION IS USED TO MOVE THE POINTER ACROSS THE SCREEN.
╘╥╧╒┬╠┼╙╚╧╧╘╔╬╟
╨╥╧┬╠┼═ ╙╧╠╒╘╔╧╬
├URSOR ONLY MOVES DOWN AND TO THE ╘RACKBALL IS IN JOYSTICK MODE, SWITCH
RIGHT. TO TRACKBALL MODE.
╨OINTER WIGGLES, BUT DOES NOT MOVE. ╔NSTALL THE MULTIPLEXER, OR USE
╘╥┴├╦┬┴╠╠ 1.0.
╨OINTER DOES NOT MOVE. ┘OU ARE USING THE MULTIPLEXER WITH
╘╥┴├╦┬┴╠╠ 1.0, USE ╘╥┴├╦┬┴╠╠ 2.0.
╘HE TRACKBALL IS PLUGGED INTO PORT 2,
PLUG IT INTO PORT 1.
╘HE MULTIPLEXER IS NOT WORKING, CHECK
FOR IMPROPER WIRING, SOLDER BRIDGES,
COLD SOLDER JOINTS, ECT.
├OMPUTER SHUTS DOWN WHEN YOU PLUG IN ╙HORT IN THE MULTIPLEXER, CHECK FOR
THE MULTIPLEXER. IMPROPER WIRING AND SOLDER BRIDGES.
