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Motherboard Commodore CBM 4008 Repaired for a friend

I have repaired an motherboard of a Commodore CBM 4008 for a friend. The computer at the start-up shows only a black screen

The components that have been replaced are:

  • 1 x Video Ram 2114
  • 2 x SN74LS244
  • 1 x 6520

The computer after the repair works perfectly. You can see from the Photo.

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