diff --git a/rtl/config.vhd b/rtl/config.vhd
index 2e10475..d95bd99 100644
--- a/rtl/config.vhd
+++ b/rtl/config.vhd
@@ -234,21 +234,18 @@ package config is
   );
 
   constant RYGAR_GAME_CONFIG : game_config_t := (
-    cpu_freq   => 4,
     mem_map    => RYGAR_MEM_MAP,
     snd_map    => RYGAR_SND_MAP,
     gpu_config => (DEFAULT_TILE_CONFIG, DEFAULT_TILE_CONFIG, DEFAULT_TILE_CONFIG, DEFAULT_SPRITE_CONFIG)
   );
 
   constant GEMINI_GAME_CONFIG : game_config_t := (
-    cpu_freq   => 6,
     mem_map    => GEMINI_MEM_MAP,
     snd_map    => GEMINI_SND_MAP,
     gpu_config => (DEFAULT_TILE_CONFIG, GEMINI_TILE_CONFIG, GEMINI_TILE_CONFIG, GEMINI_SPRITE_CONFIG)
   );
 
   constant SILKWORM_GAME_CONFIG : game_config_t := (
-    cpu_freq   => 6,
     mem_map    => SILKWORM_MEM_MAP,
     snd_map    => GEMINI_SND_MAP,
     gpu_config => (DEFAULT_TILE_CONFIG, DEFAULT_TILE_CONFIG, DEFAULT_TILE_CONFIG, GEMINI_SPRITE_CONFIG)
diff --git a/rtl/tecmo.vhd b/rtl/tecmo.vhd
index bc20bba..01e3a5c 100644
--- a/rtl/tecmo.vhd
+++ b/rtl/tecmo.vhd
@@ -119,7 +119,6 @@ architecture arch of tecmo is
   signal game_config : game_config_t;
 
   -- CPU signals
-  signal cpu_cen     : std_logic;
   signal cpu_addr    : unsigned(CPU_ADDR_WIDTH-1 downto 0);
   signal cpu_din     : byte_t;
   signal cpu_dout    : byte_t;
@@ -332,7 +331,7 @@ begin
   port map (
     RESET_n     => not reset,
     CLK         => clk,
-    CEN         => cpu_cen,
+    CEN         => cen_6,
     WAIT_n      => not (gpu_busy or pause_reg),
     INT_n       => cpu_int_n,
     M1_n        => cpu_m1_n,
@@ -523,12 +522,6 @@ begin
   -- set game config
   game_config <= select_game_config(to_integer(game_index));
 
-  -- Set CPU clock enable
-  --
-  -- Different games run the CPU clock at different frequencies (i.e. 4Mhz or
-  -- 6Mhz).
-  cpu_cen <= cen_6 when game_config.cpu_freq = 6 else cen_4;
-
   -- set chip select signals
   prog_rom_1_cs  <= '1' when addr_in_range(cpu_addr, game_config.mem_map.prog_rom_1)  else '0';
   prog_rom_2_cs  <= '1' when addr_in_range(cpu_addr, game_config.mem_map.prog_rom_2)  else '0';
diff --git a/rtl/types.vhd b/rtl/types.vhd
index 48b75a0..aea49f8 100644
--- a/rtl/types.vhd
+++ b/rtl/types.vhd
@@ -192,7 +192,6 @@ package types is
 
   -- game configuration
   type game_config_t is record
-    cpu_freq   : natural;
     mem_map    : mem_map_t;
     snd_map    : snd_map_t;
     gpu_config : gpu_config_t;