added full protection against illegal IEC device numbers

2019-07-20 16:30:58 +02:00
1 parent f26431b502
commit 2613553ef3
@@ -14,7 +14,10 @@

 talk:

-	and #$1F ; make sure bits encoding the command are cleared out
+	;; First check whether device number is correct
+	jsr iec_devnum_check
+	bcs kernalerror_DEVICE_NOT_FOUND
+	;; Encode and execute the command
 	ora #$40
 	sta BSOUR
 	jmp iec_tx_command