diff --git a/fuzzers/030-iob/Makefile b/fuzzers/030-iob/Makefile
index 3c7a4289..24e5cfd1 100644
--- a/fuzzers/030-iob/Makefile
+++ b/fuzzers/030-iob/Makefile
@@ -1,26 +1,16 @@
 N := 1
-SPECIMENS := $(addprefix build/specimen_,$(shell seq -f '%03.0f' $(N)))
-SPECIMENS_OK := $(addsuffix /OK,$(SPECIMENS))
+include ../fuzzer.mk
 
-database: $(SPECIMENS_OK)
-	${XRAY_SEGMATCH} -o build/segbits_ioblx.db $(addsuffix /segdata_liob33.txt,$(SPECIMENS))
+database: build/segbits_liob33.db
 
-#pushdb:
-#	${XRAY_MERGEDB} ioblm_l build/segbits_ioblx.db
-#	${XRAY_MERGEDB} ioblm_r build/segbits_ioblx.db
+build/segbits_liob33.rdb:
+	${XRAY_SEGMATCH} -o build/segbits_liob33.rdb $(addsuffix /segdata_liob33.txt,$(SPECIMENS))
 
-$(SPECIMENS_OK):
-	bash generate.sh $(subst /OK,,$@)
-	touch $@
+build/segbits_liob33.db: build/segbits_liob33.rdb
+	${XRAY_DBFIXUP} --db-root build --zero-db bits.dbf --seg-fn-in $^ --seg-fn-out $@
 
-run:
-	$(MAKE) clean
-	$(MAKE) database
-	$(MAKE) pushdb
-	touch run.ok
+pushdb:
+	${XRAY_MERGEDB} liob33 build/segbits_liob33.db
 
-clean:
-	rm -rf build
-
-.PHONY: database pushdb run clean
+.PHONY: database pushdb
 
diff --git a/fuzzers/030-iob/bits.dbf b/fuzzers/030-iob/bits.dbf
new file mode 100644
index 00000000..57741c98
--- /dev/null
+++ b/fuzzers/030-iob/bits.dbf
@@ -0,0 +1 @@
+38_98 39_97 39_99,LIOB33.IOB_Y1.PULLTYPE.PULLDOWN
diff --git a/fuzzers/030-iob/generate.py b/fuzzers/030-iob/generate.py
index 53d41f3f..a7055d1c 100644
--- a/fuzzers/030-iob/generate.py
+++ b/fuzzers/030-iob/generate.py
@@ -1,6 +1,7 @@
 #!/usr/bin/env python3
 
 from prjxray.segmaker import Segmaker
+from prjxray import segmaker
 
 segmk = Segmaker("design.bits")
 
@@ -22,7 +23,11 @@ for l in f:
     PULLDOWN
     PULLUP          X   X
     '''
-    segmk.add_site_tag(site, "PULL.NONE", val in ("", "KEEPER", "PULLUP"))
+    if val == "":
+        val = "NONE"
+    segmaker.add_site_group_zero(
+        segmk, site, "PULLTYPE.", ("NONE", "KEEPER", "PULLDOWN", "PULLUP"),
+        "PULLDOWN", val)
 
 segmk.compile()
 segmk.write()
diff --git a/fuzzers/030-iob/generate.tcl b/fuzzers/030-iob/generate.tcl
index 7d111506..171fec1a 100644
--- a/fuzzers/030-iob/generate.tcl
+++ b/fuzzers/030-iob/generate.tcl
@@ -55,10 +55,10 @@ proc loc_pins {} {
 
         set_property -dict "PACKAGE_PIN $pin IOSTANDARD LVCMOS33" $port
 
-        # list_property isn't working
+        # list_property isn't working (maybe due to empty?)
         # set keys [list_property_value PULLTYPE $port]
-        set keys "PULLUP PULLDOWN KEEPER"
-        # set keys "NONE KEEPER"
+        # NONE placeholder for ""
+        set keys "NONE PULLUP PULLDOWN KEEPER"
         set val [randsample_list 1 $keys]
         if { $val == "NONE" } {
             set val ""