Commodore 64 Assy No. 250469 Rev. 4 motherboard and case

Assy 250469 Rev. 4

This is a Version E PCB produced from 1987 (known revisions include Rev. 3, Rev.4, Rev. A & Rev. B). These motherboards are also known as the Commodore 64C short boards. The BASIC and Kernal ICs have been combined in a single ROM at U4. The keyboard connector and CIA #1 (MOS 6526) have changed locations. The PLA and various TTL chips have been replaced by a new 64-pin IC. The board revision introduced a new SID chip (MOS 8580) which runs at 9V, and a new VIC-II graphics chip (MOS 8565) running at 5V. The motherboard comes in two colors – yellow and green. More images of the two motherboards can be found below:

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The inside of the machine with the yellow motherboard:IMG_3162

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The CPU, the VIC-II and the SID chips all have heatsinks attached to keep them running cool.

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All electrolytic capacitors have been replaced by new ones as described in the C64 Capacitor Mod (link).

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The outside of the case:

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The power LED color is red.

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The green motherboard looks like this:

Commodore 64C Assy 250469 Rev.4 green motherboard

Commodore 64C Assy 250469 Rev.4 green motherboard

Commodore 64C Assy 250469 Rev.4 green motherboard

Commodore 64C Assy 250469 Rev.4 green motherboard

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