diff --git a/firmware/FIRMWARE.ZX1 b/firmware/FIRMWARE.ZX1
index a543ba4..885ab07 100644
Binary files a/firmware/FIRMWARE.ZX1 and b/firmware/FIRMWARE.ZX1 differ
diff --git a/firmware/firmware.asm b/firmware/firmware.asm
index 3ba50d2..705913c 100644
--- a/firmware/firmware.asm
+++ b/firmware/firmware.asm
@@ -405,9 +405,7 @@ start5  djnz    start6
         jr      nz, start6
         ld      hl, $0017       ; Si se acaba el temporizador borrar
         ld      de, $2001       ; lo de presione Break
-        push    bc
         call    window
-        pop     bc
         ld      hl, (joykey)
         inc     h
         inc     l
@@ -417,8 +415,8 @@ start5  djnz    start6
         rlca
         rlca
         or      l
+        ld      bc, zxuno_port
         ld      de, joy_conf<<8 | scandbl_ctrl
-        dec     b
         out     (c), d
         inc     b
         out     (c), a