.po 1 PX-8 TO COMMODORE C-128 CONNECTION HELP FILE By Dennis E. Vipond Hampton, Va. & Ron D. Foreman VA Beach. Va. Overview: ========= After many hours of trying to figure out how to hook up a PX-8 to a Commodore C-128 along with numerious long distance phone call to Lyle Geise we deceided to produce this file for others. It took us over 2 months t finall ge ou PX-8 t tal t th Commodor C-12 a thi i wha thi documen i al about M deepes thank t Lyl Geis fo hi understandin an patient wit us fo h i th rea on tha designe thi unit. Hardwar required: ================== Mos o th specia adapter an suc ca b purchase fro Jamec Electronic 135 Shorewa Road Belmont Ca 9400 (415 592-8097 Thes item wil b marke wit a * Jus abou everythin els w purchase fro Radi Shac (item marke +). ITE NO PAR NUMBE QT REQ ES COS DESCRIPTION ============================================================================== MAX232CP 5.1 MA 23 CHIP 12/24S 1.4 COMMODOR CONNECTOR APEPTR 12.9 DB2 T PI MIN DIN 276-14 .9 PREDRILLE P BOARD 270-22 1.6 ECONOM CASE 276-199 .8 LO PROFIL SOCKE 16-PIN 272-101 .6 2 u AXIA CAPACITORS 272-102 .6 2 u RADIA CAPACITORS 271-15 .2 10 oh RESISTOR 1 272-101 .5 1 u AXIA CAPACITOR 1 SOLDER 1 SHRIN TUBING 1 WIRE 1 64-302 .9 VINY GROMMETS Not - Ite i u t yo a t you choic o cable W ha a extr cabl tha wa bough fro Da Augustin tha w used Ite i you optio t install I wa bette fo u t solde o th socke an no o th MAX232 chip the jus plu i i whe w wer don soldering Ite 1 ca b you choic a t soli o mult strai wire W reccommen th soli stra (easie fo u t wor with). .PA Procedure: ========== 1 Se u - Spli ite i pieces. Dril hole i ite fo you cables. Inser prope siz grommi i hole drilled 2 Carefull loo a th diagram a th en o th documen befor procedin an further I yo don' understan i fin someon tha does 3 Plac th socke o th PC-Boar i convien locatio wit th pin stickin ou o th sid wit th expose copper. 4 Ben ove pin 1 an 11 Thi wil secur th socke t th boar unti yo mak th firs fe solde connections. 5 Solde th capacitor betwee pin 3 5 an t groun a show i th diagram below 6 Nex solde th resisto an th capacitor a pin #1 # o th MAX232. 7 Solde th wire t th Commodor connectio a show i th diagra below. 8 Solde th wire fro th Commodor connectio t th MAX23 a show i th diagra below. 9 Solde th wire fro th PX- t th MAX23 a show i th diagra below. 10 No DOUBL CHEC you boar t insur tha al connection ar mad tha ar show i th diagram below I yo misse anythin g bac an correc i befor proceedin t ste 11. 11 Plu i th MAX23 int th socket b carefu no t plu i i backwards Ther i smal cu ou i th to o th MAX232 (No reall al tha larg an coul b misse easily) 12 No plu i bot end t th tw computer an hav fun. Software and Such ================= W hav foun tha th FLIN o th P an C128LIN o th C12 wor jus fine W hav als use ME o bot machine wit success Insur tha yo hav th NE CP operatin syste fo th C128 Th ol syste di no allo acces t th USE por o th C128 Yo ca tel whic syste yo hav whe bootin u CPM Th on tha yo nee i dat Decembe 1986 Th progra tha wil upgrad you CP i publi domai an availabl fro COMPUSERV an w hav see i o ROYA OA BB 313-759-6569. Enjoy Denni Ron .pa Diagrams ======== SYMBOLS: POSITIV SID - NEGATIV SIDE C22 = 22uf CAPACITOR C10 = 10uf CAPACOTOR R100 = 100 OHM RESISTOR Actual MAX232CPE Pin assignments: ____ ____ 1| |_| |16 2| |15 3| |14 4| |13 5| |12 6| |11 7| |10 8|_________| 9 CABLE {Not tha th pi arrangemen i no th actua locatio o th MAX23 i th followin diagrams} C C 1_______GROUND MAX232CPE GROUND__________1 P R o o 12____| | _______ ___________2 X S m n A____| | | |13____________| _________3 2 m n N____| |______15| | | ____4 8 3 o e | | 7______________| |___5 2 d c B________________12| | ____6 C o t C____| ______10| | |___7 r i M__________| _____9| | _______8 e o H____________| | | 8________________| n 2__R100__________16|_______| 2__ | |________-C22+______| | |_+C10-____GROUND OTHER CONNECTIONS: ALL NUMBERS AT THE END OF THE LINES REFER TO THE MAX232 PINS 1____+C22-_____3 6______-C22+______GROUND 4____+C22-_____5 15______GROUND