Table-based version

Directory /pub/cbm/schematics/computers/c64/

Here are some schematic diagrams of the Commodore 64.

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[Parent directory]

cartridges@

Commodore 64 cartridges

drives@

Disk drives

firmware@

System firmware

manual-html/

Commodore 64 Service Manual in HTML format.

manual/

Service Manual, Model C64 Computer, Feb. 1985 PN-314001-02

sx-64/

The portable variant of the Commodore 64

250469-rev.A-left.gif

250469-rev.A-right.gif

250469-rev.B-right.gif

Commodore 64c rev.A and rev.B (new design). The 64c boards have the following texts: PCB ASSY NO. 250469 and PCB NO. 252311 REV.A (or B on newer boards). The difference between the two revisions is in the Gate Array chip: The one in rev.B includes COLOR RAM. That is why only the right half of the schematic diagram differs. The REV.A schematics also has the part number 252312.

251138-1of2.gif@

251138-2of2.gif@

Commodore 64 schematic diagram 251138 from the Service Manual

251469-1of2.gif@

251469-2of2.gif@

Commodore 64 schematic diagram 251469 from the Service Manual

252278-1.gif

252278-2.gif

Commodore 64 schematic diagram 252278. This seems to be an intermediate cost-reduced version, with 64kb�4 memory chips but small ROMs.

252312-left.gif

252312-right.gif

A bit better scan of the 250469 REV.A, with 8 levels of gray.

326106-1of2.gif@

326106-2of2.gif@

Commodore 64 schematic diagram 326106 from the Service Manual

c64-cassette-io.gif

A block diagram of the Commodore 64 cassette I/O circuitry. Taken from the SAMS C64 Troubleshooting Guide.

c64-powersupply.gif

A block diagram of the Commodore 64 internal power supply (how the +12V, +9V and TOD clock signals are generated from the 9V AC input). Taken from the SAMS C64 Troubleshooting Guide.

c64-r1.chips.gif

A chip location diagram of the first C64 board revision. Assy number unknown, or maybe 251138. Taken from the SAMS C64 Troubleshooting Guide.

c64-video.gif

A block diagram of the video circuitry in the first C64 board revision. Taken from the SAMS C64 Troubleshooting Guide.

c64bus.gif

A block diagram of the bus signals in the C64.

c64extps.gif

Commodore 64 Power Supply, part no. 902503-02, input 116V 60Hz 40W. This is the North American power supply that can be taken apart. The schematic was drawn by William Levak. According to him, the transistor and the 300 ohm resistor can be removed and replaced with a standard +5V 750mA voltage regulator, which is much more reliable.

ciasid.gif

CIA and SID pinouts and general data

cpupla.gif

6510 and PLA pinouts and general data

mem.gif

2048k*8 SRAM pinout and general data. VIA pinout.

modulator-251025.gif@

Modulator schematic 251025 from the Service Manual

modulator-251696.gif@

Modulator schematic 251696 from the Service Manual

prg-cpu-left.gif

prg-cpu-right.gif

prg-vic-left.gif

prg-vic-right.gif

Commodore 64 schematic diagram, scanned with 360 DPI, 2 colours. This seems to be the same (buggy) schematic that was published in the Commodore 64 Programmer's Reference Guide, but has been partially translated into German.
The vic part contains the ROMs, SIDs, Video Controller, RAMs, Address-decoding, Expansion Port and User Port.
The cpu part contains the Port elements (CIA), CPU, AC-Adaptor, Timer, Port Layout
All resistors are 0.25W �5% and all capacitors are in �F, unless otherwise stated.

ultimax.gif

Commodore VIC-10, a.k.a. UltiMax a.k.a. "Vickie" schematic diagram, drawn by Ruud Baltissen. For more information on this extremely rare machine, see http://www.funet.fi/pub/cbm/html/c64/ultimax.html.

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