[Open-graphics] bootstrapping the video mode

[James Richard Tyrer]

Timothy Miller wrote:

> I'm not sure where to put the dirty flag.  
> 
I still think in terms of building stuff with separate parts. :-)  In 
that case, you would have an 8K x 1 bit dual port SRAM for the 'dirty' 
bits and a decoder for chip select so that it would parallel the RAM 
that was used for the character buffer (8K x 16).  So with an ASIC, I 
suppose that you would have a small SRAM on the chip for that purpose.

Note that 132 x 60 characters is the largest VESA character mode.  132 * 
60 = 7920 or 7.734375 K.

-- 
JRT