Function Name: SETNAM

Purpose: Set file name
Call address: $FFBD (hex) 65469 (decimal)
Communication registers: A, X, Y
Preparatory routines:
Stack requirements: 2
Registers affected:

Description: 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.

How to Use:

1. Load the accumulator with the length of the file name.
2. Load the .X index register with the low order address of the file name.
3. Load the .Y index register with the high order address.
4. Call this routine.

EXAMPLE:

   LDA #NAME2-NAME     ;LOAD LENGTH OF FILE NAME
   LDX #<NAME          ;LOAD ADDRESS OF FILE NAME
   LDY #>NAME
   JSR SETNAM