--- nono/vm/sio.cpp	2026/04/29 17:04:56	1.1.1.7
+++ nono/vm/sio.cpp	2026/04/29 17:05:06	1.1.1.8
@@ -6,6 +6,7 @@
 
 #include "sio.h"
 #include "interrupt.h"
+#include "keyboard.h"
 
 //          IODevice
 //              |
@@ -27,7 +28,14 @@ SIODevice::SIODevice()
 	cr.chan[0].desc = "Serial Console";
 	cr.chan[1].desc = "Keyboard";
 
+	// 153.6kHz = 6.510416...usec / bit;
+	// 12bit = 78.125usec
+	txc12_ns = 78.125_usec;
+
 	// LUNA では SIO と呼ぶほうが通りがいい。
+	for (int ch = 0; ch < txevent.size(); ch++) {
+		txevent[ch].SetName(string_format("SIO Ch%s TX", cr.chan[ch].name));
+	}
 	monitor.Regist(ID_MONITOR_SIO);
 }
 
@@ -108,3 +116,18 @@ SIODevice::Interrupt()
 	putlog(2, "Interrupt");
 	gInterrupt->AssertINT(this);
 }
+
+void
+SIODevice::Tx(int ch, uint32 data)
+{
+	switch (ch) {
+	 case 0:
+		// TODO: シリアル送信処理
+		break;
+	 case 1:
+		gKeyboard->Command(data);
+		break;
+	 default:
+		__unreachable();
+	}
+}