Set file name
Function AddressDescription
SETNAM FFBDSet file name

This routine is used to set up the file name for the OPEN, SAVE, or LOAD routines.

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.

LDA#filenameEnd-filenameLength of filename
LDX#<filenameAddress of filename
JSRSETNAMSet filename