diff --git a/src/crab/gba.cr b/src/crab/gba.cr
index 3449ef2..a0f962d 100644
--- a/src/crab/gba.cr
+++ b/src/crab/gba.cr
@@ -3,6 +3,7 @@ require "./util"
 require "./scheduler"
 require "./cartridge"
 require "./mmio"
+require "./keypad"
 require "./bus"
 require "./interrupts"
 require "./cpu"
@@ -13,6 +14,7 @@ class GBA
   getter scheduler : Scheduler
   getter cartridge : Cartridge
   getter mmio : MMIO { MMIO.new self }
+  getter keypad : Keypad { Keypad.new }
   getter bus : Bus { Bus.new self }
   getter interrupts : Interrupts { Interrupts.new }
   getter cpu : CPU { CPU.new self }
@@ -36,7 +38,7 @@ class GBA
       when SDL::Event::Quit then exit 0
       when SDL::Event::Keyboard,
            SDL::Event::JoyHat,
-           SDL::Event::JoyButton
+           SDL::Event::JoyButton then keypad.handle_keypad_event event
       else nil
       end
     end
diff --git a/src/crab/keypad.cr b/src/crab/keypad.cr
new file mode 100644
index 0000000..9410465
--- /dev/null
+++ b/src/crab/keypad.cr
@@ -0,0 +1,97 @@
+class Keypad
+  class KEYINPUT < BitField(UInt16)
+    num not_used, 6
+    bool l
+    bool r
+    bool down
+    bool up
+    bool left
+    bool right
+    bool start
+    bool :select
+    bool b
+    bool a
+  end
+
+  class KEYCNT < BitField(UInt16)
+    bool irq_condition
+    bool irq_enable
+    num not_used, 4
+    bool l
+    bool r
+    bool down
+    bool up
+    bool left
+    bool right
+    bool start
+    bool :select
+    bool b
+    bool a
+  end
+
+  @keyinput = KEYINPUT.new 0xFFFF_u16
+  @keycnt = KEYCNT.new 0xFFFF_u16
+
+  def read_io(io_addr : Int) : Byte
+    case io_addr
+    when 0x130 then 0xFF_u8 & @keyinput.value
+    when 0x131 then 0xFF_u8 & @keyinput.value >> 8
+    when 0x132 then 0xFF_u8 & @keycnt.value
+    when 0x133 then 0xFF_u8 & @keycnt.value >> 8
+    else            raise "Unimplemented keypad read ~ addr:#{hex_str io_addr.to_u8!}"
+    end
+  end
+
+  def write_io(io_addr : Int, value : Byte) : Nil
+    case io_addr
+    when 0x130 then nil
+    when 0x131 then nil
+    else            raise "Unimplemented keypad write ~ addr:#{hex_str io_addr.to_u8!}, val:#{value}"
+    end
+  end
+
+  def handle_keypad_event(event : SDL::Event) : Nil
+    case event
+    when SDL::Event::Keyboard
+      bit = !event.pressed?
+      case event.sym
+      when .down?, .d?  then @keyinput.down = bit
+      when .up?, .e?    then @keyinput.up = bit
+      when .left?, .s?  then @keyinput.left = bit
+      when .right?, .f? then @keyinput.right = bit
+      when .semicolon?  then @keyinput.start = bit
+      when .l?          then @keyinput.select = bit
+      when .b?, .j?     then @keyinput.b = bit
+      when .a?, .k?     then @keyinput.a = bit
+      when .w?          then @keyinput.l = bit
+      when .r?          then @keyinput.r = bit
+      else                   nil
+      end
+    when SDL::Event::JoyHat
+      @keyinput.value |= 0x00F0
+      case event.value
+      when LibSDL::HAT_DOWN      then @keyinput.down = false
+      when LibSDL::HAT_UP        then @keyinput.up = false
+      when LibSDL::HAT_LEFT      then @keyinput.left = false
+      when LibSDL::HAT_RIGHT     then @keyinput.right = false
+      when LibSDL::HAT_LEFTUP    then @keyinput.left = true; @keyinput.up = true
+      when LibSDL::HAT_LEFTDOWN  then @keyinput.left = true; @keyinput.down = true
+      when LibSDL::HAT_RIGHTUP   then @keyinput.right = true; @keyinput.up = true
+      when LibSDL::HAT_RIGHTDOWN then @keyinput.right = true; @keyinput.down = true
+      else                            nil
+      end
+    when SDL::Event::JoyButton
+      bit = !event.pressed?
+      case event.button
+      when 0 then @keyinput.b = bit
+      when 1 then @keyinput.a = bit
+      when 4 then @keyinput.l = bit
+      when 5 then @keyinput.r = bit
+      when 6 then @keyinput.select = bit
+      when 7 then @keyinput.start = bit
+      else        nil
+      end
+    else nil
+    end
+  end
+end
diff --git a/src/crab/mmio.cr b/src/crab/mmio.cr
index e15a48e..6a5ce83 100644
--- a/src/crab/mmio.cr
+++ b/src/crab/mmio.cr
@@ -8,8 +8,8 @@ class MMIO
       @gba.ppu.read_io io_addr
     elsif (io_addr >= 0x200 && io_addr <= 0x203) || (io_addr >= 0x208 && io_addr <= 0x209)
       @gba.interrupts.read_io io_addr
-    elsif io_addr >= 0x130 && io_addr <= 0x133 # todo keypad
-      0xFF_u8
+    elsif io_addr >= 0x130 && io_addr <= 0x133
+      @gba.keypad.read_io io_addr
     elsif not_used? io_addr
       0xFF_u8 # todo what is returned here?
     else
@@ -23,6 +23,8 @@ class MMIO
       @gba.ppu.write_io io_addr, value
     elsif (io_addr >= 0x200 && io_addr <= 0x203) || (io_addr >= 0x208 && io_addr <= 0x209)
       @gba.interrupts.write_io io_addr, value
+    elsif io_addr >= 0x130 && io_addr <= 0x133
+      @gba.keypad.read_io io_addr
     elsif not_used? io_addr
     else
       raise "Unmapped MMIO write: #{hex_str index.to_u32}"