Int 15 Fn 50  - Dos/v - Font Subsystem Access                              [J]

   AH = 50h
   AL = which function address to retrieve
       00h "read font" function
       01h "write font" function
   BL = 00h
   BH = character size (00h single-byte, 01h double-byte)
   DH = width of character cell
   DL = height of character cell
   BP = code page (see #0396)

Return: CF clear if successful
       AH = 00h
       ES:BX -> requested function's address
   CF set on error
       AH = error code (see #0397)

See Also: AH=49h

(Table 0396)
Values for DOS/V code page:
 0 default
 437   US English
 932   Japanese
 934   Korea
 936   China
 938   Taiwan

See Also: #1446

(Table 0397)
Values for DOS/V error code:
 01h   invalid font type in BH
 02h   BL not zero
 03h   invalid font size
 04h   invalid code page
 80h   unsupported function (PC)
 86h   unsupported function (XT)

See Also: #1366