Move_Mem_a ($F683)

Move_Mem_a_1 ($F67F)

This routine copies a block of memory, starting at the hi address, and working down to the low address. The base of the source address is specified in the U register, and the base of the destination address is specified in the X register. The A register contains the number of bytes to copy; 0x80 is the maximum value which can be specified.

ENTRY:

A-reg = byte count (Move_Mem_a only)

A-reg = byte count minus 1 (Move_Mem_a_1 only)

X-reg points to the destination

U-reg points to the source

EXIT:

A-reg = $FF

B-reg = first byte of source

Source