diff --git a/main.cpp b/main.cpp
index 7c1e869..f8816f3 100644
--- a/main.cpp
+++ b/main.cpp
@@ -1420,6 +1420,8 @@ int run(const Config& cfg) {
     std::unique_ptr<TtyProtocolWriter> tty_writer;
     const bool tty_di1_group_average = cfg.tty_path.has_value() && cfg.di1_group_average;
     const bool fast_tty_avg_stream_mode = tty_di1_group_average;
+    const uint16_t tty_packet_start_marker =
+        (cfg.profile == CaptureProfile::Amplitude) ? 0x001AU : 0x000AU;
     if (cfg.tty_path) {
         const uint64_t typical_tty_batch_frames = (static_cast<uint64_t>(read_capacity_words) + 1U) / 2U;
         const uint64_t typical_tty_batch_bytes = typical_tty_batch_frames * sizeof(uint16_t) * 4U;
@@ -1431,7 +1433,7 @@ int run(const Config& cfg) {
         tty_ring_capacity_bytes = static_cast<std::size_t>(tty_ring_bytes_u64);
         tty_writer = std::make_unique<TtyProtocolWriter>(*cfg.tty_path, tty_ring_capacity_bytes);
         if (!tty_di1_group_average) {
-            tty_writer->emit_packet_start();
+            tty_writer->emit_packet_start(tty_packet_start_marker);
         }
     }
     std::unique_ptr<CaptureFileWriter> writer;
@@ -1587,7 +1589,7 @@ int run(const Config& cfg) {
     };
 
     auto append_tty_packet_start = [&]() {
-        append_tty_frame(0x000A, 0xFFFF, 0xFFFF, 0xFFFF);
+        append_tty_frame(tty_packet_start_marker, 0xFFFF, 0xFFFF, 0xFFFF);
     };
 
     auto append_tty_group_step = [&]() {
diff --git a/tty_protocol_writer.cpp b/tty_protocol_writer.cpp
index 405f319..72caf1a 100644
--- a/tty_protocol_writer.cpp
+++ b/tty_protocol_writer.cpp
@@ -22,7 +22,9 @@ TtyProtocolWriter::TtyProtocolWriter(std::string path, std::size_t ring_capacity
 
 TtyProtocolWriter::~TtyProtocolWriter() = default;
 
-void TtyProtocolWriter::emit_packet_start() {}
+void TtyProtocolWriter::emit_packet_start(uint16_t marker) {
+    (void) marker;
+}
 
 void TtyProtocolWriter::emit_step(uint16_t index, int16_t ch1_avg, int16_t ch2_avg) {
     (void) index;
@@ -227,8 +229,8 @@ TtyProtocolWriter::~TtyProtocolWriter() {
     close_fd_if_open(impl_->fd);
 }
 
-void TtyProtocolWriter::emit_packet_start() {
-    enqueue_frame(0x000A, 0xFFFF, 0xFFFF, 0xFFFF);
+void TtyProtocolWriter::emit_packet_start(uint16_t marker) {
+    enqueue_frame(marker, 0xFFFF, 0xFFFF, 0xFFFF);
 }
 
 void TtyProtocolWriter::emit_step(uint16_t index, int16_t ch1_avg, int16_t ch2_avg) {
diff --git a/tty_protocol_writer.h b/tty_protocol_writer.h
index 55cf616..c97e92b 100644
--- a/tty_protocol_writer.h
+++ b/tty_protocol_writer.h
@@ -21,7 +21,7 @@ public:
     TtyProtocolWriter(TtyProtocolWriter&& other) noexcept = delete;
     TtyProtocolWriter& operator=(TtyProtocolWriter&& other) noexcept = delete;
 
-    void emit_packet_start();
+    void emit_packet_start(uint16_t marker = 0x000A);
     void emit_step(uint16_t index, int16_t ch1_avg, int16_t ch2_avg);
     void enqueue_encoded_frames(const uint16_t* words, std::size_t frame_count);
     StatsSnapshot stats() const;