Schematics (Commodore 64)
Find below many schematics of the Commodore 64. There are many variations of the console so the schematics may not be accurate to your specific version.


Identifying Ports

Components
U1: CIA 6526 (Keyboard & Joystick Controller) U2: CIA 6526 (Serial Bus / User Port Controller) U3: 2364 (Basic ROM) U4: 2364 (Kernal ROM) U5: 2364 (Character ROM) U6: 2114L-30 (Color RAM) U7: 6510 (MPU) U8: 7406 (Hex Inverter Buffer) U9: 4164 (DRAM 64Kb: 64K x 1-bit) U10: 4164 (DRAM 64Kb: 64K x 1-bit) U11: 4164 (DRAM 64Kb: 64K x 1-bit) U12: 4164 (DRAM 64Kb: 64K x 1-bit) U13: 74LS257 (Quad 2-Data Selectors/Multiplexer) U14: 74LS258 (Quad 2 To 1 Data Selectors/Multiplexer) U15: 74LS139 (Dual 2 To 4 Line Decoder/Demultiplexer) U16: 4066 (CMOS Quad Bilateral Analog Switch) U17: 82S100 (PLA) U18: 6581 (SID) U19: 6567 (VIC II) U20: LM556 (Dual 555 Timer) U21: 4164 (DRAM 64Kb: 64K x 1-bit) U22: 4164 (DRAM 64Kb: 64K x 1-bit) U23: 4164 (DRAM 64Kb: 64K x 1-bit) U24: 4164 (DRAM 64Kb: 64K x 1-bit) U25: 74LS257 (Quad 2-Data Selectors/Multiplexer) U26: 74LS373 (Octal D-Type Flip-Flop) U27: 74LS08 (Quad 2-Input AND Gate) U28: 4066 (CMOS Quad Bilateral Analog Switch) U29: 74LS74 (Dual D-Type Flip-Flop) U30: 74LS193 (Binary Up/Down Counter with Clear) U31: 74LS629 (Voltage Controlled Oscillator) U32: MC4044 (Phase Frequency Detector)