Adjust port mapping for Scott Baker's SIO board

Source/HBIOS/sio.asm

@@ -23,10 +23,10 @@ SIOB_DAT	.EQU	$83
 #ENDIF
 ;
 #IF (SIOMODE == SIOMODE_SMB)
-SIOA_CMD	.EQU	$80
-SIOA_DAT	.EQU	$82
-SIOB_CMD	.EQU	$81
-SIOB_DAT	.EQU	$83
+SIOA_CMD	.EQU	$82
+SIOA_DAT	.EQU	$80
+SIOB_CMD	.EQU	$83
+SIOB_DAT	.EQU	$81
 #ENDIF
 ;
 ;
@@ -312,9 +312,12 @@ SIO_OUT:
 	CALL	SIO_OST			; READY FOR CHAR?
 	JR	Z,SIO_OUT		; LOOP IF NOT
 	LD	C,(IY + 3)		; C := SIO CMD PORT
+#IF (SIOMODE == SIOMODE_RC)
 	INC	C			; BUMP TO DATA PORT
+#ENDIF
 #IF (SIOMODE == SIOMODE_SMB)
-	INC	C			; SMB SIO INC AGAIN
+	DEC C			; DECREMENT CMD PORT TWICE TO GET DATA PORT
+	DEC C
 #ENDIF
 	OUT	(C),E			; SEND CHAR FROM E
 	XOR	A			; SIGNAL SUCCESS