ocr: C64 CIRCUIT THEORY There are three versions of the C64. The C64 with a five pin connector video output (326106), The C64 with an eight pin connectar video output 1251138), and the C648 whichi has improved system clock circuit design (251489). Most circuit theory explanations will ba the same for all 10 three versions. Refer to schematic 326106 unless noted otherwise. VRI CRS IN4001 470. 50V M78120H T4 A 22 C54 01 C89 470 CBB CRG The Power Supply. +9 C5N 5OV IN4001 UNREG The oxternal power supply generates a regulated 5VUC and 9VAC. 5VDC is applied to pins 5 and VR2 CRA 1of CN7 on the C64 pcb. ...
