diff --git a/rom.py b/rom.py
index 21d7707..d588912 100644
--- a/rom.py
+++ b/rom.py
@@ -39,6 +39,10 @@ segment_font = {
     "o": 0b01011100,
     "p": 0b01110011,
     "t": 0b01111000,
+    "a": 0b01110111,
+    "b": 0b01111100,
+    "c": 0b01011000,
+    "d": 0b01011110,
 }
 
 
diff --git a/rom/config_ihp.json b/rom/config_ihp.json
new file mode 100644
index 0000000..e1ce42a
--- /dev/null
+++ b/rom/config_ihp.json
@@ -0,0 +1,28 @@
+{
+  "DESIGN_NAME": "tt_um_chip_rom",
+  "VERILOG_FILES": "dir::tt_um_chip_rom.v",
+
+  "FP_SIZING": "absolute",
+  "DIE_AREA": [0, 0, 202.08, 154.98],
+  "FP_DEF_TEMPLATE": "ref::$DESIGN_DIR/../ihp/def/tt_block_1x1_pgvdd.def",
+
+  "FP_IO_HLENGTH": 2,
+  "FP_IO_VLENGTH": 2,
+
+  "//": "period is in ns, so 20ns == 50mHz",
+  "CLOCK_PERIOD": 20,
+  "CLOCK_PORT": "clk",
+
+  "//": "don't use power rings or TopMetal",
+  "DESIGN_IS_CORE": false,
+  "RT_MAX_LAYER": "Metal5",
+
+  "//": "save some time",
+  "RUN_KLAYOUT_XOR": false,
+
+  "//": "reduce wasted space",
+  "TOP_MARGIN_MULT": 1,
+  "BOTTOM_MARGIN_MULT": 1,
+  "LEFT_MARGIN_MULT": 6,
+  "RIGHT_MARGIN_MULT": 6
+}