(ÅDITOR'S NOTE: ÔHE EXECUTION OF THIS 
 PROCESS WILL VOID YOUR COMPUTER'S 
 WARRANTY. ÒEADERS WHO ATTEMPT THIS 
 PROCESS DO SO AT THEIR OWN RISK. 
 ÎEITHER THIS AUTHOR OR ÔWIN ÃITIES 
 128 WILL TAKE RESPONSIBILITY FOR 
 LOSSES DUE TO THE ATTEMPTED EXECUTION 
 OF THE PROCESS OUTLINED IN THIS 
 ARTICLE.) 

 ÔHE PARTS YOU WILL NEED ARE : 

 * ÔWO (2) 18 PIN ÉÃ SOCKETS, TO BE 
 USED TO HOLD THE ÒÁÍ CHIPS. ÔHESE CAN 
 BE FOUND AT MOST ANY ELECTRONIC 
 SUPPLY HOUSE. 

 * ÔWO (2) 4464 ÄYNAMIC ÒÁÍ ÃHIPS, 
 WITH A SPEED OF 120 NS. ÙES THAT'S 
 CORRECT, 4464 ÒÁÍ CHIPS, É KNOW THAT 
 THE ÃOMMODORE ÐROGRAMMERS ÒEFERENCE 
 ÇUIDE SAYS 4164 ÒÁÍ CHIPS, BUT 4164 
 CHIPS ARE A SIXTEEN PIN TYPE. ÔHE 
 4416 CHIPS ARE AN 18 PIN TYPE SO IF 
 YOU TRY TO USE THE 4164'S YOU'LL HAVE 
 TWO EXTRA HOLES AND NOTHING WILL WORK 
 RIGHT. 

 ÙOU WILL NEED THE FOLLOWING TOOLS: 

 ×IRE CUTTER OR NIPPERS. 

 Á SMALL PENCIL TYPE SOLDERING IRON 
 (35 WATTS IS BE ENOUGH, MUCH MORE MAY 
 GET TOO HOT.) 

 ÓOME ROSIN CORE SOLDER OR BETTER YET, 
 ÓOLID CORE SOLDER AND A PASTE TYPE 
 NON-CORROSIVE FLUX. 

 ÓMALL PHILLIPS SCREWDRIVER. 

 ÓMALL PAIR OF PLIERS. 

 ÎOW YOU'RE READY TO BEGIN: 

 ÎÏÔÉÃÅ: ÉNTEGRATED ÃIRCUITS ARE 
 EXTREMELY SENSITIVE DEVICES, AND VERY 
 SENSITIVE TO STATIC CHARGES. Á SMALL 
 STATIC SHOCK TO A ÉÃ IS AS DEADLY TO 
 THEM AS A BOLT OF LIGHTNING WOULD BE 
 TO A HUMAN. ÔAKE EXTREME CAUTION TO 
 AVOID A STATIC DISCHARGE TO THE 
 COMPUTER. 


 ÆIRST THING TO DO IS REMOVE ALL POWER 
 CORDS AND SERIAL CONNECTORS FROM THE 
 Ã-128. ÔHIS MEANS EVERYTHING, SINCE 
 THE MAIN BOARD MUST BE REMOVED FROM 
 THE MACHINE. 

 ÔURN THE COMPUTER OVER AND LOCATE AND 
 REMOVE THE SIX (6) SCREWS HOLDING THE 
 COMPUTER CASE HALVES TOGETHER, THEN 
 CAREFULLY SEPARATE THE HALVES. ÔHIS 
 IS CRITICAL, BECAUSE THE KEYBOARD AND 
 POWER LIGHT CONNECTOR ALONG WITH A 
 GROUND BRAID FOR THE KEYBOARD ARE 
 STILL CONNECTED AND COULD BE DAMAGED. 
 ÃAREFULLY REMOVE THE SCREW HOLDING 
 THE GROUND BRAID, ALONG WITH THE 
 CONNECTORS FOR THE POWER LIGHT AND 
 KEYBOARD, TAKING NOTE OF THEIR PROPER 
 CONNECTION. É FOUND THAT THE KEYBOARD 
 CONNECTOR WAS INSTALLED WITH A BROWN 
 WIRE CLOSER TO THE POWER SWITCH, BUT 
 THINGS MAY BE DIFFERENT ON OTHER 
 MACHINES. 

 <ÐÒÅÓÓ Æ7 ÁÎÄ ÓÅÌÅÃÔ "ÇÅÔ ÎÅØÔ ÉÔÅÍ"> 
                  -::-


 ÔHE NEXT STEP IS TO REMOVE THE SCREWS 
 HOLDING DOWN THE COMPUTER BOARD AND 
 THE GROUND CASING. ÔHERE WERE SIX 
 SCREWS AROUND THE PERIMETER OF THE 
 MAIN BOARD/SHIELD ASSEMBLY, REMOVE 
 ALL OF THESE. ÔHEN YOU MUST USE THE 
 PLIERS TO GENTLY BEND THE TABS 
 HOLDING THE UPPER GROUND CASING TO 
 THE LOWER CASING. ÔHERE IS ONE MORE 
 SCREW MOUNTED ON THE GROUND CASING IN 
 ABOUT THE TOP MIDDLE, THIS MUST BE 
 REMOVED ALSO. 

 ÔHERE IS ONE SPOT WHERE THE CASING 
 HALVES WERE SOLDERED TOGETHER ON MY 
 COMPUTER AND THAT WAS IN THE FRONT 
 RIGHT SIDE, NEAR WHERE THE NUMERIC 
 KEYPAD SITS. ÃAREFULLY UNSOLDER THE 
 HALVES AND LIFT THE TOP HALF AWAY. 
 ×HAT YOU NOW SEE IS THE MAIN BOARD 
 WITH A SMALL METAL BOX ON IT, NEAR 
 THE CENTER OF THE BOARD. ÔHE CHIPS 
 THAT NEED TO BE REPLACED ARE INSIDE 
 THAT METAL BOX. 

 ÉNSIDE THE BOX ARE BOTH OF THE SCREEN 
 CONTROLLERS, THE 8564 ÖIC CHIP AND 
 THE 8563 ÖÄÃ CHIP. ÒEMOVE THE LID TO 
 THE BOX AND LOCATE THE TWO CHIPS THAT 
 ARE IDENTIFIED ON THE CIRCUIT BOARD 
 WITH THE MARKING Õ23 AND Õ25. ÏN MY 
 BOARD THESE CHIPS WERE LABELED WITH A 
 LARGE Æ AND THE PART NUMBER 
 ÍÂ81416-12. ÔHE NUMBER MAY VARY DUE 
 TO THE MANUFACTURER, BUT THE MARKINGS 
 ON THE BOARD WILL IDENTIFY THE 
 CORRECT CHIPS. 

 ÎOW FOR SOME VERY DELICATE SURGERY. 
 ÓINCE THE ÒÁÍ CHIPS WILL BE 
 DISCARDED, É SUGGEST THAT YOU 
 CAREFULLY CUT AWAY THE CHIP PINS 
 (LEADS) FROM THE BODY OF THE CHIP. 
 ÔHIS WILL MAKE REMOVING THE REMAINING 
 PORTION A LOT EASIER, AND LEAVES LESS 
 OF A CHANCE OF DAMAGING THE MAIN 
 BOARD THAN TRYING TO REMOVE THE WHOLE 
 CHIP, INTACT. ÔHE NEXT STEP IS TO 
 CAREFULLY UNSOLDER THE PINS FROM THE 
 CIRCUIT BOARD. ÍAKE SURE THAT YOU ARE 
 WORKING WITH THE CORRECT AREA, AS 
 THINGS DO GET RATHER CONFUSING WHEN 
 YOU TURN THE BOARD OVER AND NOTICE 
 ALL OF THE MANY SOLDERED AREAS. ÙOU 
 MIGHT BE BEST OFF TO MARK THE CORRECT 
 AREA WITH A FELT TIP PEN TO AVOID 
 CONFUSION. 

 ÔHE NEXT STEP WILL BE TO INSTALL THE 
 ÉÃ SOCKETS INTO THE CIRCUIT BOARD. 
 ÔRY FITTING THE SOCKETS INTO THE 
 BOARD TO MAKE SURE THAT THEY WILL FIT 
 ALL OF THE WAY THROUGH THE HOLES AND 
 THAT THERE IS ENOUGH MATERIAL POKING 
 THROUGH FOR A GOOD SOLDER JOINT. ÁLSO 
 BE SURE TO ORIENT THE SOCKETS WITH 
 THE SMALL IDENTIFICATION NOTCH ON THE 
 CORRECT END OF THE BOARD. ÔHE NOTCH 
 IS PRINTED ON THE BOARD SO YOU SHOULD 
 HAVE NO TROUBLE. 

 ×HEN YOU HAVE THE SOCKETS INSTALLED 
 CORRECTLY, LIGHTLY BEND THE PINS OVER 
 TO HOLD THEM IN PLACE AND YOU'RE 
 READY TO SOLDER THEM IN PLACE. ÁGAIN 
 BE CAREFUL, AS DRIPS OF SOLDER CAN 
 CAUSE A SHORT, AND A COLD SOLDER 
 JOINT WILL CAUSE A POOR CONNECTION. 

 <ÐÒÅÓÓ Æ7 ÁÎÄ ÓÅÌÅÃÔ "ÇÅÔ ÎÅØÔ ÉÔÅÍ"> 
                  -::-


 ÎOW YOU'RE READY TO INSTALL THE 64Ë 
 CHIPS IN THE SOCKETS, CAREFULLY 
 INSPECTING THE PINS FOR PROPER 
 ALIGNMENT. ÍOST OF THE TIME CHIPS 
 WILL BE MADE SO THAT YOU WILL HAVE TO 
 BEND THE PINS INWARD, TOWARD THE 
 CENTER, TO FIT PROPERLY IN THE 
 SOCKET. ÂUT TOO MUCH BENDING WILL 
 BREAK OFF A PIN. 

 ÏNCE YOU'VE INSTALLED THE CHIPS 
 YOU'RE READY TO START THE REASSEMBLY 
 PROCESS, JUST REVERSE THE DISASSEMBLY 
 STEPS AND MAKE SURE TO SOLDER THE 
 GROUND CASE HALVES AGAIN. ÒECONNECT 
 YOUR CABLES AND POWER UP THE 
 COMPUTER. 

 ÉF ALL WENT WELL, YOU SHOULD SEE 
 ÎÏÔÈÉÎÇ ÕÎÕÓÕÁÌ. ÔHE SAME OLD COLD 
 START UP MESSAGE AND NOTHING 
 DIFFERENT. ÓOME OF YOU MIGHT NOTICE A 
 DIFFERENT PATTERN ON THE SCREEN WHEN 
 THE INITIALIZATION PROCESS IS GOING 
 ON BUT AFTER THAT YOU SHOULD SEE THE 
 SAME ÏÌÄ ÓÃÒÅÅÎ. ÔHE COLD START 
 ROUTINES FOR THE Ã-128 INITIALIZE THE 
 ÖÄÃ REGISTERS, AND THE ÖÄÃ CHIP IS 
 TOLD THAT IT STILL HAS THE 16Ë CHIPS 
 IN IT. ÉN ORDER TO TELL THE ÖÄÃ 
 YOU'VE UPGRADED THE ÒÁÍ, YOU WILL 
 HAVE TO SET BIT 4 OF REGISTER 28. 
 ×HEN THIS IS DONE, FOR SOME REASON, 
 THE CHARACTER INFORMATION GETS 
 SCRAMBLED, BUT A CALL TO THE ÃÏÐÙ ÒÏÍ 
 ROUTINE AT $ÃÅ0Ã CLEARS THE PROBLEM. 

 ÉF YOUR SCREEN DOES NOT APPEAR THE 
 WAY IS SHOULD, LOOK FOR A COLD SOLDER 
 JOINT OR A PIN THAT IS NOT INSTALLED 
 INTO THE SOCKET CORRECTLY. É FOUND 
 THAT WHEN É TRIED TO REMOVE THE OLD 
 CHIPS IN ONE PIECE, É HAD DAMAGED A 
 PORTION OF THE COPPER FOIL ON THE 
 CIRCUIT BOARD AND HAD TO TRACE THE 
 CIRCUITS OUT AND INSTALL A JUMPER 
 WIRE FROM THE 8563 SOCKET TO ONE OF 
 THE ÒÁÍ SOCKETS. 

          <ÐÒÅÓÓ Æ5 ÆÏÒ ÍÅÎÕ>