fixed addressing mode in several routines

c64/kernal/listen.s

@@ -3,5 +3,5 @@
 listen:
 
 	;; This trivial routine is documented in 'Compute's Mapping the Commodore 64', page 223
-	ora $20
-	jmp iec_tx_byte
+	ora #$20
+	jmp iec_tx_byte ;; XXX add special routine for commands

c64/kernal/second.s

@@ -2,5 +2,5 @@
 second:
 
 	;; This trivial routine is documented in 'C64 Programmer's Reference Guide', page 296
-	ora $60
+	ora #$60
 	jmp iec_tx_byte

c64/kernal/talk.s

@@ -3,5 +3,5 @@
 talk:
 
 	;; This trivial routine is documented in 'Compute's Mapping the Commodore 64', page 223
-	ora $40
-	jmp iec_tx_byte
+	ora #$40
+	jmp iec_tx_byte ;; XXX add special routine for commands

c64/kernal/unlsn.s

@@ -3,5 +3,5 @@
 unlsn:
 
 	;; This trivial routine is documented in 'Compute's Mapping the Commodore 64', page 224
-	lda $5F
-	jmp iec_tx_byte
+	lda #$5F
+	jmp iec_tx_byte ;; XXX add special routine for commands

c64/kernal/untlk.s

@@ -3,5 +3,5 @@
 untlk:
 
 	;; This trivial routine is documented in 'Compute's Mapping the Commodore 64', page 224
-	lda $5F
-	jmp iec_tx_byte
+	lda #$5F
+	jmp iec_tx_byte ;; XXX add special routine for commands