Int 10 Fn 13  - Dos/v - Read/write Double-byte Character Set Characters/a  [J]

   AH = 13h
   AL = function
       10h read characters and standard attributes
       11h read characters and extended attributes
       12h write characters and standard attributes
       13h write characters and extended attributes
   BH = 00h
   CX = number of characters to transfer
   DH,DL = row,column at which to start transfer
   ES:BP -> buffer for/containing characters and attributes (see #0034)

Return: ES:BP buffer filled if reading
Program: DOS/V is a Japanese-language version of MS-DOS which can run on
     standard (non-Japanese) ATs and compatible equipped with a VGA or
     newer video adapter

Notes: subfunctions 11h and 13h are only valid when DOS/V is using video
     mode 73h
   the cursor position is not changed by these functions
   extended attributes consist of three bytes; the first is the standard
     character attribute byte, the second is as described below, and the
     third is always zero in current versions

See Also: AH=00h,AH=13h"VIDEO"

Bitfields for DOS/V second extended attribute byte:
Bit(s) Description (Table 0034)
 7 underline using foreground color
 6 reverse foreground/background specified in standard attribute byte
 5-4   unused
 3 vertical white grid line in cell
 2 horizontal white grid line in cell
 1-0   unused

See Also: #0013,#0025