--- nono/vm/dmac.h	2026/04/29 17:05:33	1.1.1.15
+++ nono/vm/dmac.h	2026/04/29 17:05:38	1.1.1.16
@@ -20,6 +20,7 @@ class ADPCMDevice;
 class FDCDevice;
 class InterruptDevice;
 class MainbusDevice;
+class Syncer;
 
 struct DMAC
 {
@@ -301,6 +302,9 @@ class DMACDevice : public IODevice
 	void WriteCCR(DMACChan *chan, uint32 data, uint8 up);
 	void WriteGCR(uint8 data);
 
+	// ACT ビットの状態を変更
+	void ChangeACT(DMACChan *, bool);
+
 	// 割り込み信号線の状態を変更
 	void ChangeInterrupt();
 
@@ -336,6 +340,7 @@ class DMACDevice : public IODevice
 	FDCDevice *fdc {};
 	InterruptDevice *interrupt {};
 	MainbusDevice *mainbus {};
+	Syncer *syncer {};
 
 	Event event { this };