Int 10 Fn 12  - Tandy 2000 - Video - Scroll Window                         [V]

   AH = 12h
   AL = number of rows or columns to scroll
   BH = buffer flag
       00h data in user buffer
       ES:SI -> buffer containing character/attribute pairs
       01h no buffer, fill emptied rows/columns with blanks
   BL = direction in which to scroll
       00h up
       01h down
       02h left
       03h right
   CH,CL = row,column of upper left corner of scroll area
   DH,DL = row,column of lower right corner

Return: nothing

Notes: this interrupt is identical to INT 52 on Tandy 2000
   the user buffer, if supplied, must be organized by row; regardless of
     the scroll direction, all character/attribute pairs for the first
     row are first, then the pairs for the second row, etc.

See Also: AH=00h,AH=0Bh/BH=02h,AH=11h"Tandy 2000",AH=12h"Tandy 2000"

See Also: INT 52"Tandy"