adapted to Kick Assembler, some documentation update

c64/kernal/iec/iec_check_devnum.s

@@ -1,22 +1,22 @@
 
-;;
-;; Checks whether device number (in .A) is a correct IEC device number
-;;
-;; Preserves .A, .X and .Y
-;;
+//
+// Checks whether device number (in .A) is a correct IEC device number
+//
+// Preserves .A, .X and .Y
+//
 
 iec_check_devnum:
-	;; 0, 1, 2, or 3 are illegal - reserved for non-IEC devices on Commodore
+	// 0, 1, 2, or 3 are illegal - reserved for non-IEC devices on Commodore
 	cmp #$04
-	bcs +
-	;; FALLTROUGH
+	bcs !+
+	// FALLTROUGH
 iec_check_devnum_failed:
-	sec ; indicate non-IEC device
+	sec // indicate non-IEC device
 	rts
-*
-	;; 31 and above are illegal too, due to IEC command encoding scheme,
-	;; see https://www.pagetable.com/?p=1031
+!:
+	// 31 and above are illegal too, due to IEC command encoding scheme,
+	// see https://www.pagetable.com/?p=1031
 	cmp #$1F
 	bcs iec_check_devnum_failed
-	;; Carry is clear here - indicates IEC device
+	// Carry is clear here - indicates IEC device
 	rts