|SETNAM||FFBD||Set file name|
The accumulator must be loaded with the length of the file name. The X and Y registers must be loaded with the address of the file name, in standard 6502 low-byte/high-byte format.
The address can be any valid memory address in the system where a string of characters for the file name is stored.
If no file name is desired, the accumulator must be set to 0, representing a zero file length. The X and Y registers can be set to any memory address in that case.