diff --git a/firmware/FIRMWARE.ZX1 b/firmware/FIRMWARE.ZX1
index f868a93..3276e07 100644
Binary files a/firmware/FIRMWARE.ZX1 and b/firmware/FIRMWARE.ZX1 differ
diff --git a/firmware/firmware.asm b/firmware/firmware.asm
index 2110986..39b3b23 100644
--- a/firmware/firmware.asm
+++ b/firmware/firmware.asm
@@ -317,7 +317,11 @@ start5  in      a, (c)
         dec     (hl)
 star54  inc     hl
         ld      (hl), 'M'
-star55
+star55  ld      a, (outvid)
+        rrca
+        jr      nc, star56
+        wreg    master_conf, %01010000
+star56  
       IF  vertical=0
         ld      bc, $090b
         call_prnstr             ; CoreID