diff --git a/compiler/characterizer/delay.py b/compiler/characterizer/delay.py
index a6edeb8f..dfb05db3 100644
--- a/compiler/characterizer/delay.py
+++ b/compiler/characterizer/delay.py
@@ -782,7 +782,7 @@ class delay(simulation):
         # sys.exit(1)
 
         self.write_power_stimulus(trim=True)
-        self.stim.run_sim()
+        self.stim.run_sim(self.power_stim_sp)
         trim_leakage_power=parse_spice_list("timing", "leakage_power")
         debug.check(trim_leakage_power!="Failed", "Could not measure leakage power.")
         debug.info(1, "Leakage power of trimmed array is {0} mW".format(trim_leakage_power * 1e3))
diff --git a/compiler/characterizer/setup_hold.py b/compiler/characterizer/setup_hold.py
index c61e556e..f3b9541c 100644
--- a/compiler/characterizer/setup_hold.py
+++ b/compiler/characterizer/setup_hold.py
@@ -218,7 +218,7 @@ class setup_hold():
                                                                                                  infeasible_bound,
                                                                                                  feasible_bound))
 
-            self.stim.run_sim()
+            self.stim.run_sim(self.stim_sp)
             clk_to_q = convert_to_float(parse_spice_list("timing", "clk2q_delay"))
             setuphold_time = convert_to_float(parse_spice_list("timing", "setup_hold_time"))
             if type(clk_to_q) == float and (clk_to_q < 1.1 * ideal_clk_to_q) and type(setuphold_time)==float:
diff --git a/compiler/globals.py b/compiler/globals.py
index 23bb5bfb..c6980d9e 100644
--- a/compiler/globals.py
+++ b/compiler/globals.py
@@ -469,7 +469,7 @@ def set_default_corner():
         if OPTS.nominal_corner_only:
             OPTS.process_corners = ["TT"]
         else:
-            OPTS.process_corners = tech.spice["fet_models"].keys()
+            OPTS.process_corners = list(tech.spice["fet_models"].keys())
 
     if (OPTS.supply_voltages == ""):
         if OPTS.nominal_corner_only:
diff --git a/compiler/tests/22_sram_1bank_4mux_func_test.py b/compiler/tests/22_sram_1bank_4mux_func_test.py
index ee7795c0..2065a4a2 100755
--- a/compiler/tests/22_sram_1bank_4mux_func_test.py
+++ b/compiler/tests/22_sram_1bank_4mux_func_test.py
@@ -46,8 +46,7 @@ class sram_1bank_4mux_func_test(openram_test):
         tempspice = OPTS.openram_temp + "sram.sp"
         s.sp_write(tempspice)
 
-        corner = (OPTS.process_corners[0], OPTS.supply_voltages[0], OPTS.temperatures[0])
-        f = functional(s.s, tempspice, corner)
+        f = functional(s.s, tempspice)
         (fail, error) = f.run()
         self.assertTrue(fail, error)
 
diff --git a/compiler/tests/22_sram_1bank_8mux_func_test.py b/compiler/tests/22_sram_1bank_8mux_func_test.py
index 7600b7c0..a4f2ca31 100755
--- a/compiler/tests/22_sram_1bank_8mux_func_test.py
+++ b/compiler/tests/22_sram_1bank_8mux_func_test.py
@@ -49,8 +49,7 @@ class sram_1bank_8mux_func_test(openram_test):
         tempspice = OPTS.openram_temp + "sram.sp"
         s.sp_write(tempspice)
 
-        corner = (OPTS.process_corners[0], OPTS.supply_voltages[0], OPTS.temperatures[0])
-        f = functional(s.s, tempspice, corner)
+        f = functional(s.s, tempspice)
         (fail, error) = f.run()
         self.assertTrue(fail, error)
 
diff --git a/compiler/tests/22_sram_1bank_nomux_1rw_1r_func_test.py b/compiler/tests/22_sram_1bank_nomux_1rw_1r_func_test.py
index fbeb08c5..4f3368c2 100755
--- a/compiler/tests/22_sram_1bank_nomux_1rw_1r_func_test.py
+++ b/compiler/tests/22_sram_1bank_nomux_1rw_1r_func_test.py
@@ -49,8 +49,7 @@ class psram_1bank_nomux_func_test(openram_test):
         tempspice = OPTS.openram_temp + "sram.sp"
         s.sp_write(tempspice)
 
-        corner = (OPTS.process_corners[0], OPTS.supply_voltages[0], OPTS.temperatures[0])
-        f = functional(s.s, tempspice, corner)
+        f = functional(s.s, tempspice)
         (fail, error) = f.run()
         self.assertTrue(fail, error)
 
diff --git a/compiler/tests/22_sram_1bank_nomux_func_test.py b/compiler/tests/22_sram_1bank_nomux_func_test.py
index 27dfc4e5..17d3c951 100755
--- a/compiler/tests/22_sram_1bank_nomux_func_test.py
+++ b/compiler/tests/22_sram_1bank_nomux_func_test.py
@@ -45,8 +45,7 @@ class sram_1bank_nomux_func_test(openram_test):
         tempspice = OPTS.openram_temp + "sram.sp"
         s.sp_write(tempspice)
 
-        corner = (OPTS.process_corners[0], OPTS.supply_voltages[0], OPTS.temperatures[0])
-        f = functional(s.s, tempspice, corner)
+        f = functional(s.s, tempspice)
         (fail, error) = f.run()
         self.assertTrue(fail, error)
 
diff --git a/compiler/tests/22_sram_1bank_nomux_sparecols_func_test.py b/compiler/tests/22_sram_1bank_nomux_sparecols_func_test.py
index 0df39226..5199da62 100755
--- a/compiler/tests/22_sram_1bank_nomux_sparecols_func_test.py
+++ b/compiler/tests/22_sram_1bank_nomux_sparecols_func_test.py
@@ -46,8 +46,7 @@ class sram_1bank_nomux_sparecols_func_test(openram_test):
         tempspice = OPTS.openram_temp + "sram.sp"
         s.sp_write(tempspice)
 
-        corner = (OPTS.process_corners[0], OPTS.supply_voltages[0], OPTS.temperatures[0])
-        f = functional(s.s, tempspice, corner)
+        f = functional(s.s, tempspice)
         (fail, error) = f.run()
         self.assertTrue(fail, error)
 
diff --git a/compiler/tests/22_sram_1bank_wmask_1rw_1r_func_test.py b/compiler/tests/22_sram_1bank_wmask_1rw_1r_func_test.py
index f5573ae2..1af4846d 100755
--- a/compiler/tests/22_sram_1bank_wmask_1rw_1r_func_test.py
+++ b/compiler/tests/22_sram_1bank_wmask_1rw_1r_func_test.py
@@ -52,8 +52,7 @@ class sram_wmask_1w_1r_func_test(openram_test):
         tempspice = OPTS.openram_temp + "sram.sp"
         s.sp_write(tempspice)
 
-        corner = (OPTS.process_corners[0], OPTS.supply_voltages[0], OPTS.temperatures[0])
-        f = functional(s.s, tempspice, corner)
+        f = functional(s.s, tempspice)
         (fail, error) = f.run()
         self.assertTrue(fail, error)
 
diff --git a/compiler/tests/22_sram_wmask_func_test.py b/compiler/tests/22_sram_wmask_func_test.py
index dd3ac8d7..d921ade8 100755
--- a/compiler/tests/22_sram_wmask_func_test.py
+++ b/compiler/tests/22_sram_wmask_func_test.py
@@ -48,8 +48,7 @@ class sram_wmask_func_test(openram_test):
         tempspice = OPTS.openram_temp + "sram.sp"
         s.sp_write(tempspice)
 
-        corner = (OPTS.process_corners[0], OPTS.supply_voltages[0], OPTS.temperatures[0])
-        f = functional(s.s, tempspice, corner)
+        f = functional(s.s, tempspice)
         (fail, error) = f.run()
         self.assertTrue(fail, error)
 
diff --git a/compiler/tests/26_hspice_pex_pinv_test.py b/compiler/tests/26_hspice_pex_pinv_test.py
index 74f1ae9c..425c14fe 100755
--- a/compiler/tests/26_hspice_pex_pinv_test.py
+++ b/compiler/tests/26_hspice_pex_pinv_test.py
@@ -77,7 +77,7 @@ class hspice_pex_pinv_test(openram_test):
         sim_file = OPTS.openram_temp + "stim.sp"
         log_file_name = "timing"
         test_sim = self.write_simulation(sim_file, test_module, top_level_name)
-        test_sim.run_sim()
+        test_sim.run_sim("stim.sp")
         delay = parse_spice_list(log_file_name, "pinv_delay")
         return delay
 
diff --git a/compiler/tests/26_ngspice_pex_pinv_test.py b/compiler/tests/26_ngspice_pex_pinv_test.py
index 7e3800ec..233e3f5e 100755
--- a/compiler/tests/26_ngspice_pex_pinv_test.py
+++ b/compiler/tests/26_ngspice_pex_pinv_test.py
@@ -76,7 +76,7 @@ class ngspice_pex_pinv_test(openram_test):
         sim_file = OPTS.openram_temp + "stim.sp"
         log_file_name = "timing"
         test_sim = self.write_simulation(sim_file, test_module, top_level_name)
-        test_sim.run_sim()
+        test_sim.run_sim("stim.sp")
         delay = parse_spice_list(log_file_name, "pinv_delay")
         return delay
 
diff --git a/compiler/verify/__init__.py b/compiler/verify/__init__.py
index b084f053..8b7a6233 100644
--- a/compiler/verify/__init__.py
+++ b/compiler/verify/__init__.py
@@ -40,7 +40,7 @@ else:
         OPTS.magic_exe = get_tool("GDS", ["magic"])
 
 if not OPTS.drc_exe:
-    from .none import run_drc, print_drc_stats
+    from .none import run_drc, print_drc_stats, write_drc_script
 elif "calibre"==OPTS.drc_exe[0]:
     from .calibre import run_drc, print_drc_stats, write_drc_script
 elif "assura"==OPTS.drc_exe[0]: