diff --git a/atkbd.pio b/atkbd.pio
index f8a4d80..18d3e90 100644
--- a/atkbd.pio
+++ b/atkbd.pio
@@ -32,7 +32,7 @@ send_byte:
 
 send_bit:
     wait 0 pin 1
-    out pins 1
+    out pindirs 1
     wait 1 pin 1
     jmp x-- send_bit
 
diff --git a/keyboard.c b/keyboard.c
index b51f24f..5a846a8 100644
--- a/keyboard.c
+++ b/keyboard.c
@@ -43,7 +43,7 @@ static int parity(int x) {
 }
 static void kbd_write_blocking(int value) {
     value = value | (parity(value) << 8);
-    pio_sm_put_blocking(kbd_pio, kbd_sm, value);
+    pio_sm_put_blocking(kbd_pio, kbd_sm, ~value);
 }
 
 static bool expect(int expected, const char *msg) {