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VGA character overlay mode problem

Altera_Forum
Honored Contributor II
‎04-26-2010 02:20 AM
1,387 Views

document about VGA says:when the Character Overlay Mode is chosen,you should add a defined symbol OVERLAY_MODE to compile the program correctly. 

what is the meaning?and how to add the defined symbol ? 

i use quartus ii 6.1.
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