diff --git a/cime/cime_config/acme/machines/config_pio.xml b/cime/cime_config/acme/machines/config_pio.xml
index e1716e68c5b5..b7caef03cad4 100644
--- a/cime/cime_config/acme/machines/config_pio.xml
+++ b/cime/cime_config/acme/machines/config_pio.xml
@@ -46,6 +46,7 @@
     <values>
       <value>pnetcdf</value>
       <value mach="userdefined">netcdf</value>
+      <value mach="melvin">netcdf</value>
       <value mach="eastwind">netcdf</value>
       <value mach="constance">netcdf</value>
       <value mach="sooty">netcdf</value>
diff --git a/cime/cime_config/acme/testmods_dirs/allactive/cam/cosplite/user_nl_cam b/cime/cime_config/acme/testmods_dirs/allactive/cam/cosplite/user_nl_cam
new file mode 100644
index 000000000000..4cc984323767
--- /dev/null
+++ b/cime/cime_config/acme/testmods_dirs/allactive/cam/cosplite/user_nl_cam
@@ -0,0 +1 @@
+cosp_lite = .true.
\ No newline at end of file
diff --git a/cime/cime_config/acme/testmods_dirs/allactive/cam/cosplite/xmlchange_cmnds b/cime/cime_config/acme/testmods_dirs/allactive/cam/cosplite/xmlchange_cmnds
new file mode 100644
index 000000000000..87e28ea8cf51
--- /dev/null
+++ b/cime/cime_config/acme/testmods_dirs/allactive/cam/cosplite/xmlchange_cmnds
@@ -0,0 +1 @@
+./xmlchange --append CAM_CONFIG_OPTS='-cosp'
diff --git a/cime/cime_config/acme/testmods_dirs/allactive/cam/outfrq9s/xmlchange_cmnds b/cime/cime_config/acme/testmods_dirs/allactive/cam/outfrq9s/xmlchange_cmnds
index ac78d092c67a..0d976d6f0d0e 100644
--- a/cime/cime_config/acme/testmods_dirs/allactive/cam/outfrq9s/xmlchange_cmnds
+++ b/cime/cime_config/acme/testmods_dirs/allactive/cam/outfrq9s/xmlchange_cmnds
@@ -1,5 +1 @@
-if [ `./xmlquery MACH -value` = "melvin" ]; then
-    ./xmlchange PIO_TYPENAME=netcdf
-fi
-
 ./xmlchange ROF_NCPL=48