Int 10 Fn 11  - Video - Text-mode Character Generator Functions (ps, EGA,  [V]

   AH = 11h
   The following functions will cause a mode set, completely resetting
   the video environment, but without clearing the video buffer
   AL = 00h, 10h: load user-specified patterns
       ES:BP -> user table
       CX    = count of patterns to store
       DX    = character offset into map 2 block
       BL    = block to load in map 2
       BH    = number of bytes per character pattern
   AL = 01h, 11h: load ROM monochrome patterns (8 by 14)
       BL    = block to load
   AL = 02h, 12h: load ROM 8 by 8 double-dot patterns
       BL    = block to load
   AL = 03h: set block specifier
       BL    = block specifier
          (EGA/MCGA) bits 0,1 = block selected by chars with attribute
                    bit 3 = 0
                 bits 2,3 = block selected by chars with attribute
                    bit 3 = 1
          (VGA) bits 0,1,4 = block selected by attribute bit 3 = 0
            bits 2,3,5 = block selected by attribute bit 3 = 1
   AL = 04h, 14h: load ROM 8x16 character set (VGA)
       BL  = block to load

Notes: The routines called with AL=1xh are designed to be called only
     immediately after a mode set and are similar to the routines called
     with AL=0xh, except that:
         Page 0 must be active.
         Bytes/character is recalculated.
         Max character rows is recalculated.
         CRT buffer length is recalculated.
         CRTC registers are reprogrammed as follows:
            R09 = bytes/char-1 ; max scan line (mode 7 only)
            R0A = bytes/char-2 ; cursor start
            R0B = 0        ; cursor end
            R12 = ((rows+1)*(bytes/char))-1 ; vertical display end
            R14 = bytes/char   ; underline loc
              (*** BUG: should be 1 less ***)
   the current block specifiers may be determined with INT 10/AH=1Bh,
     looking at offsets 2Bh and 2Ch of the returned data (VGA only)

See Also: AH=1Bh,AX=CD10h