diff --git a/emulator/render-bridge/pod_render_trn.conf b/emulator/render-bridge/pod_render_trn.conf
new file mode 100644
index 00000000..ec496a36
--- /dev/null
+++ b/emulator/render-bridge/pod_render_trn.conf
@@ -0,0 +1,87 @@
+# pod_render_norio.conf -- pod_render_rec with the RIO serial port OFF.
+#
+# The emulator log shows a steady stream of serial1 RX OVERRUN errors on
+# the RIO pipe, and controls post their events at HighEventPriority
+# UNCONDITIONALLY (CONTROLS.HPP:250) -- so a chattering RIO port would
+# flood a priority the background pump always serves first, starving the
+# priority-0 renderer events the load gate waits on.  This conf tests that
+# by removing the port entirely.  Everything else is identical to the rec
+# conf, so a launch here and a hang there isolates the RIO.
+#
+[sdl]
+output=opengl
+# higher,higher not highest: HIGH_PRIORITY_CLASS starved the host desktop;
+# with the retry patches a rare dropout self-recovers (see gauge_rio.conf).
+priority=higher,higher
+[dosbox]
+memsize=32
+machine=svga_s3
+[cpu]
+core=dynamic
+cputype=pentium
+cycles=max
+[sblaster]
+sbtype=sb16
+sbbase=220
+irq=5
+dma=1
+hdma=5
+[mixer]
+# match the EMU8000s' native rate (no resample) and buffer ~60ms so brief
+# emulation-thread stalls (RIO retry recovery) don't audibly chop
+rate=44100
+blocksize=1024
+prebuffer=60
+[serial]
+# RIO on COM1 with the low-latency options (rxpollus/rxburst) so the board's
+# few-ms ACK deadline is met; plasma display on COM2 (real pod has both).
+# VWE fork namedpipe backend (com0com/realport retired -- COM1/COM2 gone):
+# DOSBox = pipe client (retry), vRIO/vPLASMA apps = servers; an unconnected
+# pipe behaves as an unplugged cable so the mission still runs. serialnamedpipe.h
+serial1=disabled
+serial2=namedpipe pipe:vplasma
+# live UNBUFFERED game output: DOS char devices are not buffered, so
+# redirecting stdout to COM3 lands every line immediately.  A normal
+# '> file' redirect stays 0 bytes until the process exits, which hides
+# all progress on a run that does NOT crash.
+serial3=file file:C:\VWE\TeslaRel410\emulator\render-bridge\podlog.txt
+[autoexec]
+mount c "C:\VWE\TeslaRel410\ALPHA_1"
+c:
+cd \REL410\BT
+set VIDEOFORMAT=svga
+rem production pod card init (PARAMETR.BAT:181-186): DIAGNOSE + AWEUTIL per
+rem card -- AWEUTIL /S does the EMU8000 bring-up and DRAM detect the HMI SOS
+rem driver relies on; skipping it left the cards uninitialized (silent).
+rem aweutil /s SKIPPED for now: it verifies the AWE32 GM ROM, which the
+rem emulated cards lack (hangs in a retry loop) -- restore once the ROM is
+rem dumped from a real card. diagnose /s kept (passes, sets mixer config).
+set BLASTER=A220 I5 D1 H5 P330 T6
+c:\sb16\diagnose /s
+set BLASTER=A240 I7 D3 H6 P300 T6
+c:\sb16\diagnose /s
+set BLASTER=A220 I5 D1 H5 P330 T6
+set TEMP=c:\
+rem arena1 city mission (TESTARN.EGG: map=arena1, time=day) with the RIO
+rem attached; stdout redirected so mission-load progress survives kills.
+set BT_JOINTS=1
+set L4VIEWEXT=1
+set BT_MECH_LOG=1
+set BT_MAP_LOG=1
+set BT_MER_LOG=1
+set BT_VID_LOG=1
+set BT_LAUNCH_LOG=1
+set BT_STACK_LOG=1
+set BT_FORCE_THROTTLE=0.0
+set BT_FORCE_TURN=0.5
+set HEAPSIZE=15000000
+set L4GAUGE=640x480x16
+call setenv.bat r s n p
+32rtm.exe -x
+BTL4REC.EXE -egg testarn.egg > COM3
+
+echo GAME-RC=%errorlevel% >> RC.TXT
+32rtm.exe -u
+echo ALPHA1-RUN-DONE
+pause
+
diff --git a/restoration/source410/BT/MECH.CPP b/restoration/source410/BT/MECH.CPP
index dfb1d066..36f657de 100644
--- a/restoration/source410/BT/MECH.CPP
+++ b/restoration/source410/BT/MECH.CPP
@@ -1596,6 +1596,14 @@ void
 		limping = (mode == 3 || mode == 4) && hasGimpClips;
 	}
 
+	//
+	// The master performance clears the leg reset latch at the top of every
+	// frame (@0x4a9bff); the wind-down inside the advancer may set it again,
+	// and the turn-in-place dispatcher below honours it -- so a walk that
+	// wound down THIS frame cannot re-enter as a turn until the next.
+	//
+	legResetLatch = 0;
+
 	if (limping)
 	{
 		AdvanceLegAnimationGimp(time_slice);
@@ -1604,6 +1612,37 @@ void
 	{
 		AdvanceLegAnimation(time_slice);
 	}
+
+	//
+	// THE TURN-IN-PLACE DISPATCHER (master perf @0x4aa505-0x4aa588, decoded
+	// from raw disasm -- Ghidra never decompiled the function).  From
+	// Standing, arm the trn clip when the mech is TURNING (the binary tests
+	// |angularVelocity| > 1e-4; at a standstill the turn rate is exactly
+	// walkingTurnRate, so the operand is turnDemand * walkingTurnRate), the
+	// speed demand sits in the FULL sub-walk band [0, standSpeed], the model
+	// has a trn clip, and the wind-down debounce is clear.
+	//
+	// BOTH channels arm on the same frame -- the lockstep weld.  Arming only
+	// the leg lets the body enter its next cycle frames apart and the two
+	// walk cycles run permanently out of phase.  Each trn clip plays one
+	// turn figure and drops back to Standing (the case-4 group), so a held
+	// turn re-arms clip after clip.
+	//
+	if (!limping && turnCapable != 0 && legResetLatch == 0)
+	{
+		Scalar
+			standstill_turn_rate = turnDemand * walkingTurnRate;
+		if (
+			legStateAlarm.GetLevel() == 0 &&
+			bodyStateAlarm.GetLevel() == 0 &&
+			speedDemand >= 0.0f && speedDemand <= standSpeed &&
+			(standstill_turn_rate > 1.0e-4f || standstill_turn_rate < -1.0e-4f)
+		)
+		{
+			SetLegAnimation(4);
+			SetBodyAnimation(4);
+		}
+	}
 	{
 		Scalar stride = limping
 			? AdvanceBodyAnimationGimp(time_slice, 0)