diff --git a/wasm-port/docs/porting-steps-standalone.md b/wasm-port/docs/porting-steps-standalone.md
index 108d03f..1ff77ab 100644
--- a/wasm-port/docs/porting-steps-standalone.md
+++ b/wasm-port/docs/porting-steps-standalone.md
@@ -370,6 +370,16 @@ Current verified progress:
   conversion through vendored `interp_cycles.cc`, including `G81`, `G82`,
   `G83`, `G80` cancellation, dwell, peck drilling, and incremental `L`
   repeats.
+- `runtime/core/linuxcnc_wrap/linuxcnc_interp_minimal_runtime.cpp` now records
+  coordinate-system canonical boundary calls emitted by vendored LinuxCNC
+  conversion code: `SET_G5X_OFFSET`, `SET_G92_OFFSET`, `SET_XY_ROTATION`,
+  `CANON_UPDATE_END_POINT`, `USE_LENGTH_UNITS`, and `SELECT_PLANE`.
+  `tests/fixtures/gcode/coordinate_offsets.ngc` and
+  `tests/fixtures/canon/coordinate_offsets.events` pin `G55`, active
+  `G10 L2`, `G92`, `G92.1`, and `G54` behavior from
+  `interp_convert.cc::convert_coordinate_system()`,
+  `interp_convert.cc::convert_setup()`, and
+  `interp_convert.cc::convert_axis_offsets()`.
 - `tests/fixtures/gcode_errors/g1_zero_feed.ngc` and
   `tests/fixtures/canon_errors/g1_zero_feed.expected` pin the negative
   `G1` zero-feed case. The source basis is LinuxCNC
diff --git a/wasm-port/runtime/core/linuxcnc_wrap/linuxcnc_interp_minimal_runtime.cpp b/wasm-port/runtime/core/linuxcnc_wrap/linuxcnc_interp_minimal_runtime.cpp
index 98da38d..414728a 100644
--- a/wasm-port/runtime/core/linuxcnc_wrap/linuxcnc_interp_minimal_runtime.cpp
+++ b/wasm-port/runtime/core/linuxcnc_wrap/linuxcnc_interp_minimal_runtime.cpp
@@ -51,12 +51,76 @@ int USER_DEFINED_FUNCTION_ADD(USER_DEFINED_FUNCTION_TYPE func, int num)
 }
 
 void INIT_CANON() {}
-void SET_G5X_OFFSET(int, double, double, double, double, double, double, double, double, double) {}
-void SET_G92_OFFSET(double, double, double, double, double, double, double, double, double) {}
-void SET_XY_ROTATION(double) {}
-void CANON_UPDATE_END_POINT(double, double, double, double, double, double, double, double, double) {}
-void USE_LENGTH_UNITS(CANON_UNITS) {}
-void SELECT_PLANE(CANON_PLANE) {}
+void SET_G5X_OFFSET(int index,
+                    double x, double y, double z,
+                    double a, double b, double c,
+                    double u, double v, double w)
+{
+    std::ostringstream oss;
+    oss << "SET_G5X_OFFSET index=" << index
+        << " x=" << x
+        << " y=" << y
+        << " z=" << z
+        << " a=" << a
+        << " b=" << b
+        << " c=" << c
+        << " u=" << u
+        << " v=" << v
+        << " w=" << w;
+    standalone::push_canon_event(oss.str());
+}
+void SET_G92_OFFSET(double x, double y, double z,
+                    double a, double b, double c,
+                    double u, double v, double w)
+{
+    std::ostringstream oss;
+    oss << "SET_G92_OFFSET"
+        << " x=" << x
+        << " y=" << y
+        << " z=" << z
+        << " a=" << a
+        << " b=" << b
+        << " c=" << c
+        << " u=" << u
+        << " v=" << v
+        << " w=" << w;
+    standalone::push_canon_event(oss.str());
+}
+void SET_XY_ROTATION(double rotation)
+{
+    std::ostringstream oss;
+    oss << "SET_XY_ROTATION rotation=" << rotation;
+    standalone::push_canon_event(oss.str());
+}
+void CANON_UPDATE_END_POINT(double x, double y, double z,
+                            double a, double b, double c,
+                            double u, double v, double w)
+{
+    std::ostringstream oss;
+    oss << "CANON_UPDATE_END_POINT"
+        << " x=" << x
+        << " y=" << y
+        << " z=" << z
+        << " a=" << a
+        << " b=" << b
+        << " c=" << c
+        << " u=" << u
+        << " v=" << v
+        << " w=" << w;
+    standalone::push_canon_event(oss.str());
+}
+void USE_LENGTH_UNITS(CANON_UNITS units)
+{
+    std::ostringstream oss;
+    oss << "USE_LENGTH_UNITS units=" << static_cast<int>(units);
+    standalone::push_canon_event(oss.str());
+}
+void SELECT_PLANE(CANON_PLANE plane)
+{
+    std::ostringstream oss;
+    oss << "SELECT_PLANE plane=" << static_cast<int>(plane);
+    standalone::push_canon_event(oss.str());
+}
 void SET_TRAVERSE_RATE(double) {}
 void SET_FEED_REFERENCE(CANON_FEED_REFERENCE) {}
 void SET_FEED_MODE(int, int) {}
diff --git a/wasm-port/tests/fixtures/canon/coordinate_offsets.events b/wasm-port/tests/fixtures/canon/coordinate_offsets.events
new file mode 100644
index 0000000..bc2a016
--- /dev/null
+++ b/wasm-port/tests/fixtures/canon/coordinate_offsets.events
@@ -0,0 +1,12 @@
+canon_event=SELECT_PLANE plane=1
+canon_event=STRAIGHT_TRAVERSE line=1 x=0 y=0 z=0 a=0 b=0 c=0 u=0 v=0 w=0
+canon_event=SET_G5X_OFFSET index=2 x=0 y=0 z=0 a=0 b=0 c=0 u=0 v=0 w=0
+canon_event=SET_G92_OFFSET x=0 y=0 z=0 a=0 b=0 c=0 u=0 v=0 w=0
+canon_event=SET_XY_ROTATION rotation=0
+canon_event=SET_G5X_OFFSET index=2 x=4 y=5 z=6 a=0 b=0 c=0 u=0 v=0 w=0
+canon_event=SET_XY_ROTATION rotation=0
+canon_event=SET_G92_OFFSET x=-14 y=-25 z=-36 a=0 b=0 c=0 u=0 v=0 w=0
+canon_event=SET_G92_OFFSET x=0 y=0 z=0 a=0 b=0 c=0 u=0 v=0 w=0
+canon_event=SET_G5X_OFFSET index=1 x=0 y=0 z=0 a=0 b=0 c=0 u=0 v=0 w=0
+canon_event=SET_G92_OFFSET x=0 y=0 z=0 a=0 b=0 c=0 u=0 v=0 w=0
+canon_event=SET_XY_ROTATION rotation=0
diff --git a/wasm-port/tests/fixtures/gcode/coordinate_offsets.ngc b/wasm-port/tests/fixtures/gcode/coordinate_offsets.ngc
new file mode 100644
index 0000000..a357b7a
--- /dev/null
+++ b/wasm-port/tests/fixtures/gcode/coordinate_offsets.ngc
@@ -0,0 +1,6 @@
+G90 G17 G0 X0 Y0 Z0
+G55
+G10 L2 P2 X4 Y5 Z6
+G92 X10 Y20 Z30
+G92.1
+G54