--- nono/vm/bankram.cpp	2026/04/29 17:05:38	1.1.1.4
+++ nono/vm/bankram.cpp	2026/04/29 17:05:51	1.1.1.6
@@ -13,6 +13,7 @@
 
 #include "bankram.h"
 #include "config.h"
+#include "mpu.h"
 
 // コンストラクタ
 BankRAMDevice::BankRAMDevice(uint objid_, int ram_size_MB)
@@ -34,7 +35,14 @@ BankRAMDevice::~BankRAMDevice()
 bool
 BankRAMDevice::Init()
 {
-	ram.reset(new uint8[ram_size]);
+	ram.reset(new(std::nothrow) uint8[ram_size]);
+	if ((bool)ram == false) {
+		errno = ENOMEM;
+		warn("BankRAM(%u bytes)", ram_size);
+		return false;
+	}
+
+	wait = busdata::Wait(1 * mpu->GetClock_nsec());
 
 	return true;
 }
@@ -71,7 +79,7 @@ BankRAMDevice::Read(busaddr addr)
 
 	data  = *(uint32 *)&ram[offset & ~3U];
 	putlog(4, "$%06x ($%06x) -> $%08x", addr.Addr(), offset, data.Data());
-	data |= busdata::Wait(1);
+	data |= wait;
 	data |= BusData::Size4;
 	return data;
 }
@@ -102,7 +110,7 @@ BankRAMDevice::Write(busaddr addr, uint3
 		}
 	}
 
-	busdata r = busdata::Wait(1);
+	busdata r = wait;
 	r |= BusData::Size4;
 	return r;
 }