Int 10 Fn 5100  - Video - Ax PC - Register External Character              [J]

   AX = 5100h
   BH = character width in bits (10h)
   BL = character height (10h)
   DX = character code (DH = F0h-F3h, DL=40h-7Eh,80h-FCh)
   ES:BP -> character bitmap

Return: AL = status (00h successful, 01h failed)

See Also: AX=5101h,INT 1F