There's a thread that describes the adapters and diodes and pinouts
https://tinkerdifferent.com/threads/documentation-for-db15-to-vga-adapters.318/
Which Macintoshes, NuBus Video Cards Only Do “Sync on Green”?
- Thread starter jdmcs
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Please can you read through and vote on the following proposition for changes to the board structure by clicking here.