diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..6366408
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,12 @@
+[submodule "tsb/io"]
+	path = tsb/io
+	url = git@git.blackmark.me:avr/io.git
+[submodule "tsb/flash"]
+	path = tsb/flash
+	url = git@git.blackmark.me:avr/flash.git
+[submodule "tsb/uart"]
+	path = tsb/uart
+	url = git@git.blackmark.me:avr/uart.git
+[submodule "tsb/type"]
+	path = tsb/type
+	url = git@git.blackmark.me:avr/type.git
diff --git a/tsb/flash b/tsb/flash
new file mode 160000
index 0000000..6edb2e5
--- /dev/null
+++ b/tsb/flash
@@ -0,0 +1 @@
+Subproject commit 6edb2e5a21e0ce58ff2df936caee8b84e240a46b
diff --git a/tsb/io b/tsb/io
new file mode 160000
index 0000000..80de36e
--- /dev/null
+++ b/tsb/io
@@ -0,0 +1 @@
+Subproject commit 80de36ee7ee3e6b0842d5eaee81d54062cb496b2
diff --git a/tsb/main.cpp b/tsb/main.cpp
index ef7c54e..9543bdd 100644
--- a/tsb/main.cpp
+++ b/tsb/main.cpp
@@ -1,6 +1,102 @@
 #include "clock.hpp"
 
+#include "uart/uart.hpp"
+
+constexpr auto READ_FLASH_CMD = 'f';
+constexpr auto WRITE_FLASH_CMD = 'F';
+constexpr auto READ_EEPROM_CMD = 'e';
+constexpr auto WRITE_EEPROM_CMD = 'E';
+constexpr auto READ_USERDATA_CMD = 'c';
+constexpr auto WRITE_USERDATA_CMD = 'C';
+constexpr auto REQUEST_CMD = '?';
+constexpr auto CONFIRM_CMD = '!';
+constexpr auto AUTO_BAUDING_CMD = '@';
+
+using uart_interface = uart::Hardware0<uart::Config<38400>, uart::Driven::BLOCKING>;
+
+enum class State {
+	WAITING,
+	ACTIVE,
+};
+
+struct DeviceInfo {
+	char name[3] = {'T', 'S', 'B'};
+	uint8_t date[2] = {0x1a, 0x1f};
+	uint8_t status = 0xf0;
+	uint8_t signature[3] = {0x1e, 0x95, 0x0f};
+	uint8_t pageSize = 0x40;
+	uint16_t flashSize = 0x3ec0;
+	uint16_t eepromSize = 0x03ff;
+};
+
+struct UserData {
+	uint16_t jumpAddress = 0xAAAA;
+	uint8_t timeout = 0x21;
+};
+
+static inline void sendDeviceInfo()
+{
+	uart::Uart<uart_interface> serial;
+
+	constexpr DeviceInfo deviceInfo;
+	constexpr UserData userData;
+
+	for (uint8_t i = 0; i < sizeof(deviceInfo); ++i) {
+		serial.txByte(*(reinterpret_cast<const uint8_t *>(&deviceInfo) + i));
+	}
+
+	for (uint8_t i = 0; i < sizeof(userData); ++i) {
+		serial.txByte(*(reinterpret_cast<const uint8_t *>(&userData) + i));
+	}
+}
+
+static uint8_t g_lastPage[128] = {};
+
+static inline void sendUserData()
+{
+	uart::Uart<uart_interface> serial;
+
+	for (uint8_t i = 0; i < sizeof(g_lastPage); ++i) {
+		serial.txByte(*(reinterpret_cast<const uint8_t *>(&g_lastPage) + i));
+	}
+}
+
+static inline void sendConfirm()
+{
+	uart::Uart<uart_interface> serial;
+	serial.txByte(CONFIRM_CMD);
+}
+
 int main()
 {
+	uart::Uart<uart_interface> serial;
+	serial.init();
+
+	State state = State::WAITING;
+
+	uint8_t receivedByte = 0;
+	uint8_t autoBaudingCounter = 0;
+
+	while (true) {
+		if (serial.rxByte(receivedByte)) {
+			if (state == State::WAITING) {
+				if (receivedByte == AUTO_BAUDING_CMD) {
+					++autoBaudingCounter;
+				}
+				if (autoBaudingCounter == 3) {
+					autoBaudingCounter = 0;
+					state = State::ACTIVE;
+					sendDeviceInfo();
+				}
+			} else if (state == State::ACTIVE) {
+				if (receivedByte == READ_USERDATA_CMD) {
+					sendUserData();
+					sendConfirm();
+					state = State::WAITING;
+				}
+			}
+		}
+	}
+
 	return 0;
 }
diff --git a/tsb/tsb.cppproj b/tsb/tsb.cppproj
index e72d63a..fa2d942 100644
--- a/tsb/tsb.cppproj
+++ b/tsb/tsb.cppproj
@@ -215,9 +215,42 @@
     <Compile Include="clock.hpp">
       <SubType>compile</SubType>
     </Compile>
+    <Compile Include="flash\flash.hpp">
+      <SubType>compile</SubType>
+    </Compile>
+    <Compile Include="io\io.hpp">
+      <SubType>compile</SubType>
+    </Compile>
     <Compile Include="main.cpp">
       <SubType>compile</SubType>
     </Compile>
+    <Compile Include="type\type.hpp">
+      <SubType>compile</SubType>
+    </Compile>
+    <Compile Include="uart\config.hpp">
+      <SubType>compile</SubType>
+    </Compile>
+    <Compile Include="uart\hardware.hpp">
+      <SubType>compile</SubType>
+    </Compile>
+    <Compile Include="uart\hardware0.hpp">
+      <SubType>compile</SubType>
+    </Compile>
+    <Compile Include="uart\hardware1.hpp">
+      <SubType>compile</SubType>
+    </Compile>
+    <Compile Include="uart\software.hpp">
+      <SubType>compile</SubType>
+    </Compile>
+    <Compile Include="uart\uart.hpp">
+      <SubType>compile</SubType>
+    </Compile>
+  </ItemGroup>
+  <ItemGroup>
+    <Folder Include="flash" />
+    <Folder Include="io" />
+    <Folder Include="uart" />
+    <Folder Include="type" />
   </ItemGroup>
   <Import Project="$(AVRSTUDIO_EXE_PATH)\\Vs\\Compiler.targets" />
 </Project>
\ No newline at end of file
diff --git a/tsb/type b/tsb/type
new file mode 160000
index 0000000..ce31ef0
--- /dev/null
+++ b/tsb/type
@@ -0,0 +1 @@
+Subproject commit ce31ef017f738baaca6f0cbf99dac9d59b5e6811
diff --git a/tsb/uart b/tsb/uart
new file mode 160000
index 0000000..ae03c8d
--- /dev/null
+++ b/tsb/uart
@@ -0,0 +1 @@
+Subproject commit ae03c8d43e46dfbd396a052f71670727b293ac76