INT 21 - DOS 3.x Internal - COPY DATA TO DOS SAVE AREA
Input
DOS1
N
DOS2
N
DOS3
Y
DOS5
Y
Output
AX
5Dh
00h
AX
BX
BX
CX
CX
DX
DX
DS:SI
Pointer
to Data to be Copied
CF
Note: This function replaces all the saved register values kept by DOS
and can transfer control to another part of the system. It's
intended purpose is not known