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Int 2F Fn 1228 U - DOS 3.3+ Internal - Move File Pointer [D]
AX = 1228h
BP = 4200h, 4201h, 4202h (see INT 21/AH=42h)
BX = file handle
CX:DX = offset in bytes
SS = DOS DS (must be using a DOS internal stack)
Return: as for INT 21/AH=42h
Notes: equivalent to INT 21/AH=42h, but may only be called from inside a DOS
function call
sets user stack frame pointer to dummy buffer, moves BP to AX, performs
LSEEK, and restores frame pointer
used by NLSFUNC to access COUNTRY.SYS when invoked by the DOS kernel
See Also: INT 21/AH=42h
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