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   ocr: CONTENTS TITLE PAGE SPECIFICATIONS 1 PARTS LIST 2 BLOCK DIAGRAM 3 THEORY BUS ARCHITECTURE 4 8502 MICROPROCESSOR 6 Z-80 MICROPROCESSOR 8 MEMORY ARCHITECTURE 11 READ ONLY MEMORY 15 RANDOM ACCESS MEMORY 17 MEMORY MANAGEMENT UNIT 20 PROGRAMMED LOGIC ARRAY 28 8701 CLOCK GENERATOR 30 VIDEO INTERFACE 31 8564 VIDEO INTERFACE CHIP 33 8563 VIDEO CONTROLLER 36 8568 CRT CONTROLLER. 39 8580 SID. 41 R/W AMP FDD. 47 I/O - INPUT/OUTPUT CIRCUITS 49 CASSETTE INTERFACE 49 KEYBOARD 51 EXPANSION BUS 52 SERIAL BUS 54 TROUBLESHOOTING COMMON LINE DEFINITIONS 56 COMMON I.C.'S (PIN ASSIGNMENTS & LOGIC) 57 PCB PCB ASSEM ...