Identify more bit flags (#1153)

constants/printer_constants.asm

@@ -1,9 +1,20 @@
 ; wPrinterStatus
 	const_def 1
-	const PRINTER_STATUS_CHECKING
-	const PRINTER_STATUS_TRANSMITTING
-	const PRINTER_STATUS_PRINTING
-	const PRINTER_ERROR_1
-	const PRINTER_ERROR_2
-	const PRINTER_ERROR_3
-	const PRINTER_ERROR_4
+	const PRINTER_STATUS_CHECKING     ; 1
+	const PRINTER_STATUS_TRANSMITTING ; 2
+	const PRINTER_STATUS_PRINTING     ; 3
+	const PRINTER_ERROR_1             ; 4
+	const PRINTER_ERROR_2             ; 5
+	const PRINTER_ERROR_3             ; 6
+	const PRINTER_ERROR_4             ; 7
+
+; wPrinterStatusFlags
+	const_def 5
+	shift_const PRINTER_STATUS_ERROR_3 ; 5
+	shift_const PRINTER_STATUS_ERROR_4 ; 6
+	shift_const PRINTER_STATUS_ERROR_1 ; 7
+
+; wPrinterConnectionOpen
+	const_def
+	const PRINTER_CONNECTION_OPEN
+	const PRINTER_CONNECTION_SUCCESS