=> R0 = length of command line buffer
<= R0 corrupt
This SWI is used to set up the size of the command line buffer when DDEUtils_SetCL is called.
Note: There is only one extended command line for the entire machine. This means a potential race condition exists, if two tasks are both using extended command lines. This seems naïve considering that the DDEUtils module partially implements a per-task current directory.
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