From: Toni Wilen <twilen@winuae.net>
Date: Sat, 1 Oct 2022 16:52:40 +0000 (+0300)
Subject: Don't emulate "sticky" RBF interrupt bit in cycle-accurate or loopback mode.
X-Git-Tag: 41000~130
X-Git-Url: https://git.unchartedbackwaters.co.uk/w/?a=commitdiff_plain;h=a2993060e1aea29ce47ff6fab164fe1552669052;p=francis%2Fwinuae.git

Don't emulate "sticky" RBF interrupt bit in cycle-accurate or loopback mode.
---

diff --git a/od-win32/serial_win32.cpp b/od-win32/serial_win32.cpp
index c0d3ed9d..c03208cb 100644
--- a/od-win32/serial_win32.cpp
+++ b/od-win32/serial_win32.cpp
@@ -313,8 +313,17 @@ static void serial_rx_irq(void)
 
 void serial_rethink(void)
 {
-	if (data_in_serdatr && ((currprefs.cpu_memory_cycle_exact && get_cycles() > data_in_serdatr_evt) || !currprefs.cpu_memory_cycle_exact)) {
-		INTREQ_INT(11, 0);
+	if (data_in_serdatr) {
+		if (currprefs.cpu_memory_cycle_exact && get_cycles() > data_in_serdatr_evt) {
+			data_in_serdatr = 0;
+		}
+		if (serloop_enabled) {
+			data_in_serdatr = 0;
+		}
+		// RBF bit is not "sticky" but without it data can be lost when using fast emulation modes and physical serial port.
+		if (data_in_serdatr) {
+			INTREQ_INT(11, 0);
+		}
 	}
 }