--- nono/vm/mpscc.cpp	2026/04/29 17:05:29	1.1.1.6
+++ nono/vm/mpscc.cpp	2026/04/29 17:05:42	1.1.1.9
@@ -22,6 +22,7 @@
 #include "bitops.h"
 #include "hostcom.h"
 #include "interrupt.h"
+#include "monitor.h"
 #include "scheduler.h"
 #include "syncer.h"
 #include <cmath>
@@ -82,8 +83,11 @@ bool
 MPSCCDevice::Create()
 {
 	// 対応するホストドライバを作成
-	hostcom.reset(new HostCOMDevice(this, "HostCOM"));
+	try {
+		hostcom.reset(new HostCOMDevice(this, "HostCOM"));
+	} catch (...) { }
 	if ((bool)hostcom == false) {
+		warnx("Failed to initialize HostCOMDevice at %s", __method__);
 		return false;
 	}
 	hostcom->SetRxCallback(ToDeviceCallback(&MPSCCDevice::HostRxCallback));
@@ -96,18 +100,15 @@ MPSCCDevice::SetLogLevel(int loglevel_)
 {
 	inherited::SetLogLevel(loglevel_);
 
-	assert((bool)hostcom);
-	hostcom->SetLogLevel(loglevel_);
+	if ((bool)hostcom) {
+		hostcom->SetLogLevel(loglevel_);
+	}
 }
 
 // 初期化
 bool
 MPSCCDevice::Init()
 {
-	if (inherited::Init() == false) {
-		return false;
-	}
-
 	interrupt = GetInterruptDevice();
 
 	scheduler->ConnectMessage(MessageID::HOSTCOM_RX, this,
@@ -404,7 +405,7 @@ MPSCCDevice::GetSR2B() const
 			stat = 3;
 		// VIS_321 とはビット順が逆
 		data &= ~0x70;
-		data |= bitrev(stat << 1);
+		data |= bitrev8(stat << 1);
 		break;
 	 default:
 		VMPANIC("corrupted mpscc.vis=%u", (uint)mpscc.vis);