I've got an elderly T1910 laptop with a 640x480 LCD display;
it'd be nice to use it all at (say) 80x48 characters in an
8x10 font.  In normal text modes (at 640x400 pixels) there's
a 640x40 blank area at the top and bottom of th screen.

Some brief experiments (with 1.5.2, which runs better on
this machine than -current) show that adding an appropriate
screen type (at 80x48 with the appropriate font) to the vga
driver works well, and as expected the extra 4 lines of
memory map appropriately onto the display.

Can anybody point me in the right direction for getting the
top memory offset right?  I've played a bit, but so far
haven't managed to get any text in that bit of display.

Mark <><