From 2baab0f856708b5d5c3ac4374dbe57b772e05854 Mon Sep 17 00:00:00 2001
From: steve <jscrane@gmail.com>
Date: Sat, 24 Feb 2024 13:02:27 +0000
Subject: [PATCH] be stricter about ACIA memory addresses

---
 acia.cpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/acia.cpp b/acia.cpp
index 5555ab6..856f8fc 100644
--- a/acia.cpp
+++ b/acia.cpp
@@ -50,7 +50,11 @@ void ACIA::write_data(uint8_t b) {
 }
 
 uint8_t ACIA::read(Memory::address a) {
-	return (a & 1)? read_data(): read_status();
+	if (a == 0)
+		return read_status();
+	if (a == 1)
+		return read_data();
+	return 0;
 }
 
 uint8_t ACIA::read_data() {