--- nono/vm/subram.cpp	2026/04/29 17:05:29	1.1.1.3
+++ nono/vm/subram.cpp	2026/04/29 17:06:01	1.1.1.5
@@ -24,9 +24,6 @@ SubRAMBaseDevice::SubRAMBaseDevice(uint
 	uint ramsize = ramsize_kb * 1024;
 	assert((ramsize & (ramsize - 1)) == 0);
 
-	ram.reset(new uint8[ramsize]);
-	memset(&ram[0], 0, ramsize);
-
 	mask = ramsize - 1;
 }
 
@@ -35,6 +32,21 @@ SubRAMBaseDevice::~SubRAMBaseDevice()
 {
 }
 
+// 初期化
+bool
+SubRAMBaseDevice::Init()
+{
+	uint ramsize = GetSize();
+	ram.reset(new(std::nothrow) uint8[ramsize]);
+	if ((bool)ram == false) {
+		warnx("Could not allocate %u bytes at %s", ramsize, __method__);
+		return false;
+	}
+	memset(&ram[0], 0, ramsize);
+
+	return true;
+}
+
 // リセット
 void
 SubRAMBaseDevice::ResetHard(bool poweron)