Lambda Electronics Lambda 8300 RAM

This is a 16K memory expansion for the Lambda 8300. However, it can probably also be used on a ZX81.

Configuration

• Built: 1984

Trivia

• Came in a bundle with other ZX81 and ZX Spectrum extensions.
• Uses 4116 type RAMs, but does not seem to have a DC/DC power converter for the required +12V and -5V lines. I guess the +12V is taken from the Lambda power, while the -5V is done by a DC/DC inverter. If that’s true, this memory expansion won’t work on a ZX81 though, because it only provides +9V.

Restauration Works

• Whitened the case
• Replaced all electrolytic capacitors. One original 1µF capacitor was replaced with a 2.2µF capacitor because I had no lower value on stock.

History

• 2023-06-19
  • Recapped
  • Tested
• 2023-06-14: Case was a bit yellowed, whitened in the sun.
• 2023-06-11: Date of purchase