From 46b74f8e9450c117910596f9b9c6700bfe4c24c8 Mon Sep 17 00:00:00 2001
From: Ed <ed@maidavale.org>
Date: Sun, 26 Nov 2017 17:47:55 +0000
Subject: [PATCH] Adjust port mapping for Scott Baker's SIO board

---
 Source/HBIOS/sio.asm | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/Source/HBIOS/sio.asm b/Source/HBIOS/sio.asm
index 8c16ffdd..6d424e3f 100644
--- a/Source/HBIOS/sio.asm
+++ b/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