From 93a1eade2a2512f9e478ab14b1dffcdb0a0cf228 Mon Sep 17 00:00:00 2001
From: b1ackmai1er <difficultylevelhigh@gmail.com>
Date: Tue, 14 Mar 2023 19:21:08 +0800
Subject: [PATCH] Update uart.asm

Make sure when UART4 is disabled, that the driver does not access the UART4 I/O ports.
---
 Source/HBIOS/uart.asm | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Source/HBIOS/uart.asm b/Source/HBIOS/uart.asm
index c8e0b9b2..1aa6150a 100644
--- a/Source/HBIOS/uart.asm
+++ b/Source/HBIOS/uart.asm
@@ -78,11 +78,13 @@ UART1_IVT	.EQU	IVT(INT_UART1)
 ;
 ;
 UART_PREINIT:
+#IF (UART4)
 ;
 ; INIT UART4 BOARD CONFIG REGISTER (NO HARM IF IT IS NOT THERE)
 ;
 	LD	A,$80			; SELECT 7.3728MHZ OSC & LOCK CONFIG REGISTER
 	OUT	(UART4BASE+$0F),A	; DO IT
+#ENDIF
 ;
 ; SETUP THE DISPATCH TABLE ENTRIES
 ;