started unification of floppy and ramdisk code

src/dos_m65/unit_ramdisk/unit_rd_cmd_close.s

@@ -3,6 +3,8 @@
 ; Close currently opened file
 ;
 
+; XXX to be unified with floppy code
+
 
 unit_rd_cmd_CLOSE:
 

src/dos_m65/unit_ramdisk/unit_rd_cmd_open.s

@@ -3,6 +3,8 @@
 ; Open file for reading
 ;
 
+; XXX to be unified with floppy code
+
 
 unit_rd_cmd_OPEN:
 

src/dos_m65/unit_ramdisk/unit_rd_cmd_read.s

@@ -3,6 +3,8 @@
 ; Read more data into the buffer
 ;
 
+; XXX to be unified with floppy code
+
 
 unit_rd_cmd_READ: