
		parameter: table index in x, new value in a
$e7df	Getname	reads a string from memory and tries to interpret it as
		a filename (with possibly leading 'drive:' and paths...)
		leading spaces are ignored. The filename is saved in
		PCBUF+FS_OPEN_NAME. If a drive is given, it is put
		into PCBUF+FS_OPEN_DRV. Otherwise this is set to -1
		parameter: a/y=address of string, returns PCBUF+...
$e7de	Chdir	takes the contents of PCBUF+FS_CMD_* and interprets it as
		a 'change directory' operation, to be done to a 