EDIT: no audio again. Thought it was solved, but no luck. I thought it would be better to open another topic on the audio issue here

So, to summarize the topic: A Mac Plus whoose Ram configuration doesn't match with the resistor's position in R8/R9 will « kind of boot », but displaying a completely black screen but the smiling Mac

Good to know, I guess.

The resistor's positions are as follow:

- resistor in R8, R9 empty => 4x 256Ko simms => 1Mb total;

- resistor in R9, R8 empty => 2x 1Mb simms in bank A, Bank B empty => 2Mb total;

- no resistor in R8/R9 => 2x 1Mb simms in bank A, 2x 256Ko simms in bank B => 2,5 Mb total, OR 4x 1Mb simms => 4Mb total. That's it!