more work on filename/command reception in CBDOS

src/dos_m65/dev_ramdisk/dev_rd_cmd_close.s

@@ -0,0 +1,12 @@
+
+;
+; Close currently opened file
+;
+
+
+dev_rd_cmd_CLOSE:
+
+	; XXX provide implementation
+
+	sec
+	jmp dos_SECOND_done

src/dos_m65/dev_ramdisk/dev_rd_cmd_open.s

@@ -0,0 +1,12 @@
+
+;
+; Open file for reading
+;
+
+
+dev_rd_cmd_OPEN:
+
+	; XXX provide implementation
+
+	sec
+	jmp dos_SECOND_done

src/dos_m65/dev_ramdisk/dev_rd_init.s

@@ -10,6 +10,7 @@ dev_rd_init:
 
 	ldx #$00
 	stx RD_STATUS_IDX
+	stx RD_CMDFN_IDX
 	dex
 @1:
 	inx