POC 80x25 RAM patch for 640x400 resolution

[maccasoft]

The attached patch allows to run the POC 80x25 RAM driver at a resolution of 640x400@70Hz instead of the current 720x400. With the 8x16 font it looks a bit better, especially if you use the full VGA font, since it doesn't have the 9th background pixel. 640x400 should also be the MS-DOS boot resolution mode.

I'm not sure if this resolution the two cogs are still necessary, or if there is some issue with the timings, it looks good on my monitor but I also have learned that it is very forgiving, so a review is very welcome.

poc-80x25-ram-640x400-driver.patch.txt

[konimaru]

Thanks, I'll have a look. I knew this resolution was around but could never find conclusive timing :)