--- nono/vm/gvram.cpp	2026/04/29 17:05:18	1.1.1.7
+++ nono/vm/gvram.cpp	2026/04/29 17:05:29	1.1.1.9
@@ -12,9 +12,11 @@
 // バイトアクセス時は HB() マクロを使用のこと。
 
 #include "gvram.h"
-#include "mpu.h"
 #include "videoctlr.h"
 
+// InsideOut p.135
+static const busdata wait = busdata::Wait(9 * 40_nsec);
+
 // コンストラクタ
 GVRAMDevice::GVRAMDevice()
 	: inherited(OBJ_GVRAM)
@@ -29,42 +31,46 @@ GVRAMDevice::~GVRAMDevice()
 {
 }
 
-uint64
-GVRAMDevice::Read8(uint32 addr)
+inline uint32
+GVRAMDevice::Decoder(uint32 addr) const
 {
-	mpu->AddCycle(9);	// Inside/Out p.135
-	uint32 offset = addr - baseaddr;
-	return mem[HB(offset)];
+	return addr - baseaddr;
 }
 
-uint64
-GVRAMDevice::Read16(uint32 addr)
+busdata
+GVRAMDevice::Read(busaddr addr)
 {
-	mpu->AddCycle(9);	// Inside/Out p.135
-	uint32 offset = addr - baseaddr;
-	return *(uint16 *)&mem[offset];
-}
+	uint32 offset = Decoder(addr.Addr());
+	busdata data;
 
-uint64
-GVRAMDevice::Write8(uint32 addr, uint32 data)
-{
-	mpu->AddCycle(9);	// Inside/Out p.135
-	uint32 offset = addr - baseaddr;
-	mem[HB(offset)] = data;
-	return 0;
+	data = *(uint16 *)&mem[offset & ~1U];
+	data |= wait;
+	data |= BusData::Size2;
+	return data;
 }
 
-uint64
-GVRAMDevice::Write16(uint32 addr, uint32 data)
+busdata
+GVRAMDevice::Write(busaddr addr, uint32 data)
 {
-	mpu->AddCycle(9);	// Inside/Out p.135
-	uint32 offset = addr - baseaddr;
-	*(uint16 *)&mem[offset] = data;
-	return 0;
+	uint32 offset = Decoder(addr.Addr());
+	uint32 reqsize = addr.GetSize();
+	uint32 datasize = std::min(2 - (offset & 1U), reqsize);
+	data >>= (reqsize - datasize) * 8;
+
+	if (datasize == 1) {
+		mem[HB(offset)] = data;
+	} else {
+		*(uint16 *)&mem[offset] = data;
+	}
+
+	busdata r = wait;
+	r |= busdata::Size(datasize);
+	return r;
 }
 
-uint64
-GVRAMDevice::Peek8(uint32 addr)
+busdata
+GVRAMDevice::Peek1(uint32 addr)
 {
-	return mem[HB(addr - baseaddr)];
+	uint32 offset = Decoder(addr);
+	return mem[HB(offset)];
 }