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    882080e2
    Fix Mode 7 (ie: SAA5050) mode double-height handling · 882080e2
    Deucе authored
    Basically, the only thing the SAA5050 enforces is that characters
    on a bottom row need to be double-height, or they're displayed as
    spaces.
    
    The Prestel terminal now has an extra bit that indicates it is a
    prestel terminal, and the bitmap console hacks up the second row.
    
    While we're poking this, use macros for magic bits in FG/BG colours.
    882080e2
    Fix Mode 7 (ie: SAA5050) mode double-height handling
    Deucе authored
    Basically, the only thing the SAA5050 enforces is that characters
    on a bottom row need to be double-height, or they're displayed as
    spaces.
    
    The Prestel terminal now has an extra bit that indicates it is a
    prestel terminal, and the bitmap console hacks up the second row.
    
    While we're poking this, use macros for magic bits in FG/BG colours.
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