Changes

[[File:Yamaha v9990.pdf|thumbnail|Yamaha V9990 Manual]]

The official 'Application Manual' describes the V9990 ports, registers and commands. These additional notes apply to the V9990 used in the CPC Powergraph video board and explain details that are not clearly described or are omitted from the manual. Note, these notes do not describe 100% of the operation, they describe the features and combinations tested to date.