diff --git a/rio-firmware/RIOv4_2-ANALYSIS.md b/rio-firmware/RIOv4_2-ANALYSIS.md
index 5be3689..e10c62c 100644
--- a/rio-firmware/RIOv4_2-ANALYSIS.md
+++ b/rio-firmware/RIOv4_2-ANALYSIS.md
@@ -374,3 +374,34 @@ The stop-and-wait + typed-resolution machinery stays enabled at every
rate as delivery insurance (it hardens 9600 production cabinets against
ordinary electrical noise, and its retries are near-zero on clean links).
62500 images remain in the repo for future firmware work.
+
+## FINAL CERTIFICATION (2026-07-19) — 31250 v2 ships
+
+Operator-verified at 31250 v2 with stop-and-wait active: **zero lamp
+misses/hangs** through the slow-chord test (the exact scenario that
+condemned 62500) and a 392-presses/min mash.
+
+`testlogs/riomash-31250v2-final`: analog 89.0% (structural), **NAK = 0**,
+25 resends — all timeout-triggered, i.e. the retry machinery silently
+healing occasional INBOUND response loss (29 host-side framing events),
+which is exactly the insurance it exists to provide. Counters flat,
+zero wedges, gaps <100ms except run-start/stop artifacts.
+
+`testlogs/riomash-31250v2-poll20` (--poll 20): delivered ~31 Hz analog
+(2036 replies/65s) vs the legacy 18 Hz — 1.7×. The 62.6%-of-slots figure
+is a host artifact, not board saturation: the poll loop delays AFTER each
+awaited exchange (~6-9 ms), so the real cadence is interval+exchange.
+Absolute-schedule pacing would approach 40+ Hz; ~94% of actually-issued
+polls were answered. Future host tweak, not firmware.
+
+### Production configuration
+| deployment | chip | config.json |
+|---|---|---|
+| native-game cabinets | `RIOv4_2_patched.bin` (9600) | defaults (RioBaudRate 9600, AnalogPollMs 55) |
+| RIOJoy-only cockpits (FastRIO) | `RIOv4_2_patched_31250v2.bin` | RioBaudRate 31250, AnalogPollMs 20-25, FTDI-class adapter |
+
+AppConfig.RioBaudRate + AnalogPollMs are plumbed through RioCoordinator;
+stop-and-wait delivery is always on (near-zero cost on clean links).
+Firmware images, hashes, disassemblies, the mechanized mash harness, and
+all eleven bench logs live in this directory. The original AMD chip is
+retired, preserved unmodified.
diff --git a/rio-firmware/testlogs/riomash-31250v2-final-20260719-141437.log b/rio-firmware/testlogs/riomash-31250v2-final-20260719-141437.log
new file mode 100644
index 0000000..cdbe5b4
--- /dev/null
+++ b/rio-firmware/testlogs/riomash-31250v2-final-20260719-141437.log
@@ -0,0 +1,28 @@
+== RIO mash test :: COM1 @ 31250 8N1, 300s, chip label '31250v2-final' ==
+ lamp echo ON (drives reply/lamp collisions), wedge threshold 2.0s, poll 55ms, app auto-recovery DISABLED
+ log: C:\VWE\riojoy\riomash-31250v2-final-20260719-141437.log
+ firmware: 4.2
+ counters before: RestartCount=0 AbandonCount=0 FullBufferCount=0 [board/lamp faults reported!]
+
+>>> MASH NOW: two hands, 8 lamp buttons, as fast as you can. <<<
+>>> Test runs 300s. A wedge alarm will beep + banner. <<<
+>>> Ctrl+C ends the run early and still prints the summary. <<<
+
+[ 31.83s] progress: presses=157 (157/min) analog=500 maxGap=0.28s wedges=0
+[ 61.84s] progress: presses=432 (419/min) analog=976 maxGap=0.28s wedges=0
+[ 65.45s] operator stop (Ctrl+C) — ending run, snapshotting counters...
+
+== MASH SUMMARY [31250v2-final] ==
+run : 65s on COM1, lamps on, wedge threshold 2.0s
+firmware : 4.2
+presses/releases : 436 / 436 (392 presses/min)
+analog replies : 1051 (~1181 poll slots; 89.0%), sentinels 0
+framing / NAK : 29 / 0 (command resends NAK/timeout: 25)
+gap histogram : <100ms:1048 100-250ms:0 250-500ms:2 0.5-1s:0 1-2s:0 2-5s:0 >5s:0
+longest gaps : 0.33s@65.4s, 0.28s@0.6s, 0.09s@45.0s, 0.08s@19.8s, 0.08s@22.4s, 0.08s@41.7s, 0.08s@24.5s, 0.08s@8.5s, 0.08s@37.5s, 0.08s@14.6s
+wedge events : 0
+counters before : RestartCount=0 AbandonCount=0 FullBufferCount=0 [board/lamp faults reported!]
+counters after : RestartCount=0 AbandonCount=0 FullBufferCount=0 [board/lamp faults reported!]
+counter delta : RestartCount=+0 AbandonCount=+0 FullBufferCount=+0
+verdict : PASS — no wedge; compare gap histogram + counter delta to baseline
+log file : C:\VWE\riojoy\riomash-31250v2-final-20260719-141437.log
diff --git a/rio-firmware/testlogs/riomash-31250v2-poll20-20260719-141620.log b/rio-firmware/testlogs/riomash-31250v2-poll20-20260719-141620.log
new file mode 100644
index 0000000..deb7c3f
--- /dev/null
+++ b/rio-firmware/testlogs/riomash-31250v2-poll20-20260719-141620.log
@@ -0,0 +1,28 @@
+== RIO mash test :: COM1 @ 31250 8N1, 120s, chip label '31250v2-poll20' ==
+ lamp echo ON (drives reply/lamp collisions), wedge threshold 2.0s, poll 20ms, app auto-recovery DISABLED
+ log: C:\VWE\riojoy\riomash-31250v2-poll20-20260719-141620.log
+ firmware: 4.2
+ counters before: RestartCount=0 AbandonCount=0 FullBufferCount=0 [board/lamp faults reported!]
+
+>>> MASH NOW: two hands, 8 lamp buttons, as fast as you can. <<<
+>>> Test runs 120s. A wedge alarm will beep + banner. <<<
+>>> Ctrl+C ends the run early and still prints the summary. <<<
+
+[ 31.97s] progress: presses=63 (63/min) analog=986 maxGap=0.51s wedges=0
+[ 62.02s] progress: presses=314 (304/min) analog=1890 maxGap=0.51s wedges=0
+[ 65.66s] operator stop (Ctrl+C) — ending run, snapshotting counters...
+
+== MASH SUMMARY [31250v2-poll20] ==
+run : 65s on COM1, lamps on, wedge threshold 2.0s
+firmware : 4.2
+presses/releases : 318 / 318 (285 presses/min)
+analog replies : 2036 (~3250 poll slots; 62.6%), sentinels 0
+framing / NAK : 73 / 0 (command resends NAK/timeout: 57)
+gap histogram : <100ms:2032 100-250ms:1 250-500ms:1 0.5-1s:1 1-2s:0 2-5s:0 >5s:0
+longest gaps : 0.51s@0.7s, 0.29s@65.7s, 0.13s@50.6s, 0.08s@55.1s, 0.07s@50.9s, 0.07s@50.7s, 0.07s@50.8s, 0.07s@54.3s, 0.06s@48.5s, 0.06s@57.9s
+wedge events : 0
+counters before : RestartCount=0 AbandonCount=0 FullBufferCount=0 [board/lamp faults reported!]
+counters after : RestartCount=0 AbandonCount=0 FullBufferCount=0 [board/lamp faults reported!]
+counter delta : RestartCount=+0 AbandonCount=+0 FullBufferCount=+0
+verdict : PASS — no wedge; compare gap histogram + counter delta to baseline
+log file : C:\VWE\riojoy\riomash-31250v2-poll20-20260719-141620.log
diff --git a/src/RioJoy.Core/Profiles/AppConfig.cs b/src/RioJoy.Core/Profiles/AppConfig.cs
index 7ba2c72..def5af0 100644
--- a/src/RioJoy.Core/Profiles/AppConfig.cs
+++ b/src/RioJoy.Core/Profiles/AppConfig.cs
@@ -10,6 +10,21 @@ public sealed class AppConfig
/// Default RIO COM port when a profile doesn't specify one.
public string DefaultRioComPort { get; set; } = "COM1";
+ ///
+ /// RIO link baud rate. 9600 = stock/wedge-patched firmware (native-game
+ /// compatible). 31250 = the validated FastRIO chip
+ /// (rio-firmware/RIOv4_2_patched_31250v2.bin) — needs an FTDI-class
+ /// adapter; classic 16550 UARTs cannot make this rate.
+ ///
+ public int RioBaudRate { get; set; } = 9600;
+
+ ///
+ /// Analog poll interval in milliseconds (legacy cadence 55 → ~18 Hz).
+ /// The FastRIO chip sustains ~20-25 ms (~30+ Hz effective; bench
+ /// 2026-07-19). Leave at 55 for stock-speed boards.
+ ///
+ public int AnalogPollMs { get; set; } = 55;
+
/// Default plasma COM port when a profile doesn't specify one.
public string? DefaultPlasmaComPort { get; set; } = "COM2";
diff --git a/src/RioJoy.Tray/RioCoordinator.cs b/src/RioJoy.Tray/RioCoordinator.cs
index f005f57..9d4eedd 100644
--- a/src/RioJoy.Tray/RioCoordinator.cs
+++ b/src/RioJoy.Tray/RioCoordinator.cs
@@ -47,7 +47,8 @@ public sealed class RioCoordinator : IDisposable
public RioCoordinator(Func config, Func? transportFactory = null)
{
_config = config ?? throw new ArgumentNullException(nameof(config));
- _transportFactory = transportFactory ?? (port => new SerialPortTransport(port));
+ _transportFactory = transportFactory
+ ?? (port => new SerialPortTransport(port, _config().RioBaudRate));
}
/// Raised (with a short status string) whenever the active state changes.
@@ -211,7 +212,11 @@ public sealed class RioCoordinator : IDisposable
}
_transport = _transportFactory(port);
- _link = new RioSerialLink(_transport);
+ _link = new RioSerialLink(_transport, new RioSerialLinkOptions
+ {
+ AnalogPollInterval = TimeSpan.FromMilliseconds(
+ Math.Max(10, config.AnalogPollMs)), // floor guards a typo'd config
+ });
_runtime = new RioRuntime(
_link,
profile.ToInputMap(),