--- nono/vm/tvram.cpp	2026/04/29 17:04:39	1.1.1.4
+++ nono/vm/tvram.cpp	2026/04/29 17:04:56	1.1.1.6
@@ -17,12 +17,8 @@
 #endif
 
 #if defined(PERF)
-// テキスト画面合成のパフォーマンス測定。PERF をどっかで有効にしてビルド。
-// X68030 IPLROM で起動してくるあたりの画面更新で測定する。
-#include <chrono>
-static int total_elapsed;
-static int total_count;
-static std::list<int> fpsarray;
+#include "perfcounter.h"
+static PerfCounter perf(100);
 #endif
 
 //
@@ -33,9 +29,8 @@ static std::list<int> fpsarray;
 std::unique_ptr<TVRAMDevice> gTVRAM;
 
 TVRAMDevice::TVRAMDevice()
+	: inherited("TVRAM")
 {
-	logname = "tvram";
-	devname = "TVRAM";
 	devaddr = baseaddr;
 	devlen  = 512 * 1024;
 
@@ -79,6 +74,7 @@ TVRAMDevice::Decoder(uint32 addr) const
 uint64
 TVRAMDevice::Read8(uint32 addr)
 {
+	gMPU->AddCycle(9);	// Inside/Out p.135
 	uint32 offset = Decoder(addr);
 	return mem[HB(offset)];
 }
@@ -86,6 +82,7 @@ TVRAMDevice::Read8(uint32 addr)
 uint64
 TVRAMDevice::Read16(uint32 addr)
 {
+	gMPU->AddCycle(9);	// Inside/Out p.135
 	uint32 offset = Decoder(addr);
 	return *(uint16 *)&mem[offset];
 }
@@ -95,6 +92,8 @@ TVRAMDevice::Write8(uint32 addr, uint32
 {
 	uint32 offset = Decoder(addr);
 
+	gMPU->AddCycle(9);	// Inside/Out p.135
+
 	// XXX とりあえずね
 	putlog(3, "Write $%06x <- $%02x", addr, data);
 
@@ -119,6 +118,8 @@ TVRAMDevice::Write16(uint32 addr, uint32
 {
 	uint32 offset = Decoder(addr);
 
+	gMPU->AddCycle(9);	// Inside/Out p.135
+
 	// XXX とりあえずね
 	putlog(3, "Write $%06x <- $%04x", addr, data);
 
@@ -205,7 +206,7 @@ TVRAMDevice::Render(uint8 *imagebuf)
 	bool updated;
 
 #if defined(PERF)
-	auto start = std::chrono::system_clock::now();
+	perf.Start();
 #endif
 
 	dst0 = imagebuf;
@@ -411,33 +412,7 @@ TVRAMDevice::Render(uint8 *imagebuf)
 	}
 
 #if defined(PERF)
-	auto end = std::chrono::system_clock::now();
-	total_elapsed += std::chrono::duration_cast<std::chrono::microseconds>
-		(end - start).count();
-	if (++total_count >= 100) {
-		int fps = 1000 * 1000 / (total_elapsed / total_count);
-		total_elapsed = 0;
-		total_count = 0;
-		printf("%d fps", fps);
-		fpsarray.push_back(fps);
-		if (fpsarray.size() > 4) {
-			fpsarray.pop_front();
-		}
-		if (fpsarray.size() > 2) {
-			int minv = 1e9;
-			int sum = 0;
-			for (auto v : fpsarray) {
-				if (v < minv)
-					minv = v;
-				sum += v;
-			}
-			// 最悪値1つを除いた移動平均
-			sum -= minv;
-			int avg = sum / (fpsarray.size() - 1);
-			printf(" (avg %d)", avg);
-		}
-		printf("\n");
-	}
+	perf.End();
 #endif
 
 	return updated;