Monochrome Graphics Interface Adapter.
A Verilog core offering 640x200, 640x240, or 640x480 depending on how the Verilog source is configured.
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MGIA usually lacks any CPU-accessible registers to configure it with.
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MGIA video memory is typically hard-wired to appear at a specific address.
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Originally built to serve as a debugging display, something guarateed to always work regardless the state of the system.
Similar to PC systems with a VGA and MDA video card in the same system, where the MDA is typically used for debugging output.