diff --git a/test-linuxcnc-source-link.sh b/test-linuxcnc-source-link.sh
index 40382bf..2ee5aaf 100755
--- a/test-linuxcnc-source-link.sh
+++ b/test-linuxcnc-source-link.sh
@@ -1424,11 +1424,16 @@ fi
 grep -q "Cannot wait for digital input with cutter radius compensation on" \
     "$output_dir/cnc_sim_linuxcnc_source_cutter_comp_wait_input_error.err"
 # Source basis: LinuxCNC src/emc/rs274ngc/interp_convert.cc
-# convert_m() rejects M63/M67/M49 while cutter radius compensation is active
-# before enqueueing digital/analog output or override canon side effects.
+# convert_m() rejects M63-M65/M67-M68/M48-M49 while cutter radius
+# compensation is active before enqueueing digital/analog output or override
+# canon side effects.
 cutter_comp_m_error_cases=(
     "linuxcnc_cutter_comp_m63_error|Cannot set motion digital output with cutter radius compensation on"
+    "linuxcnc_cutter_comp_m64_error|Cannot set auxiliary digital output with cutter radius compensation on"
+    "linuxcnc_cutter_comp_m65_error|Cannot set auxiliary digital output with cutter radius compensation on"
     "linuxcnc_cutter_comp_m67_error|Cannot set motion analog output with cutter radius compensation on"
+    "linuxcnc_cutter_comp_m68_error|Cannot set auxiliary analog output with cutter radius compensation on"
+    "linuxcnc_cutter_comp_m48_error|Cannot enable overrides with cutter radius compensation on"
     "linuxcnc_cutter_comp_m49_error|Cannot disable overrides with cutter radius compensation on"
 )
 for case in "${cutter_comp_m_error_cases[@]}"; do
diff --git a/tests/gcode/linuxcnc_cutter_comp_m48_error.ngc b/tests/gcode/linuxcnc_cutter_comp_m48_error.ngc
new file mode 100644
index 0000000..4e63fec
--- /dev/null
+++ b/tests/gcode/linuxcnc_cutter_comp_m48_error.ngc
@@ -0,0 +1,3 @@
+G21 G90 G17
+G41 D1
+M48
diff --git a/tests/gcode/linuxcnc_cutter_comp_m64_error.ngc b/tests/gcode/linuxcnc_cutter_comp_m64_error.ngc
new file mode 100644
index 0000000..91f2c1a
--- /dev/null
+++ b/tests/gcode/linuxcnc_cutter_comp_m64_error.ngc
@@ -0,0 +1,3 @@
+G21 G90 G17
+G41 D1
+M64 P1
diff --git a/tests/gcode/linuxcnc_cutter_comp_m65_error.ngc b/tests/gcode/linuxcnc_cutter_comp_m65_error.ngc
new file mode 100644
index 0000000..5e9344f
--- /dev/null
+++ b/tests/gcode/linuxcnc_cutter_comp_m65_error.ngc
@@ -0,0 +1,3 @@
+G21 G90 G17
+G41 D1
+M65 P1
diff --git a/tests/gcode/linuxcnc_cutter_comp_m68_error.ngc b/tests/gcode/linuxcnc_cutter_comp_m68_error.ngc
new file mode 100644
index 0000000..b7154f7
--- /dev/null
+++ b/tests/gcode/linuxcnc_cutter_comp_m68_error.ngc
@@ -0,0 +1,3 @@
+G21 G90 G17
+G41 D1
+M68 E0 Q1