Compatibility: EGA VGA
Expects: AX    1123H
BL    screen rows code: 00H = user-specified (in DL)
01H = 14 rows
02H = 25 rows
03H = 43 rows
DL    (when BL=0) custom number of character rows on screen
                                                                  
Returns: (none)
                                                                  
Info: Sets up to use the ROM-defined 8x8 characters when the BIOS
displays text while in graphics modes.  This sets the INT 43H
vector and sets BIOS variables needed to use the font.

- -

INT 10H 1123H: Setup ROM 8x8 Font for Graphics Mode