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Basic Disk Operating System (BDOS) Functions
4-38
PROGRAM LOAD
ENTRY
RETURN
CL: 3BH
FUNCTION 59
DX: Offset
ofFCB
PROGRAM LOAD
AX: Return Code/
Base Page Addr
BX: Base Page Addr
The Program Load function-loads a CMD file. Register DX contains the DS
relative offset of a successfully opened FCB which names the input CMD file. AX
returns the value OFFH if the program load was unsuccessful. Otherwise, AX and
BX both contain the paragraph address of the base page belonging to the loaded
program. The base address and segment length of each segment are stored in the
base page.
NOTE
Upon program load at the CCP level, the
DMA base address is initialized to the base
page of the loaded program and the DMA
offset adddress is initialized to 0080H. This is a
function of the CCP. Function 59 does not
establish a default DMA address. It is the
responsibiiity of the program which executes
function 59 to also execute function 51 to set
the DMA base, and function 26 to set the
DMA offset before passing control to the
loaded program.
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