или так:16-Bit Assembler, Linker and Utilities User's Guide
8.5.8 --stack size
Set minimum stack to size bytes (default=16).
By default, the linker allocates all unused data memory for the run-time stack. Alternatively, the programmer may allocate the stack by declaring two global symbols: __SP_init and __SPLIM_init. Use this option to ensure that at least a minimum sized stack is available. The actual stack size is reported in the link map output file. If the minimum size is not available, an error is reported