diff --git a/res/dsk/mr. do PRODOS (san inc pack).po b/res/dsk/mr. do PRODOS (san inc pack).po
index 69604e6b7..51cd10c9c 100644
Binary files a/res/dsk/mr. do PRODOS (san inc pack).po and b/res/dsk/mr. do PRODOS (san inc pack).po differ
diff --git a/res/dsk/tetris 128k PRODOS (san inc crack).po b/res/dsk/tetris 128k PRODOS (san inc crack).po
deleted file mode 100644
index ae68371d3..000000000
Binary files a/res/dsk/tetris 128k PRODOS (san inc crack).po and /dev/null differ
diff --git a/res/dsk/tetris 48k PRODOS (san inc crack).po b/res/dsk/tetris 48k PRODOS (san inc crack).po
deleted file mode 100644
index 846a69619..000000000
Binary files a/res/dsk/tetris 48k PRODOS (san inc crack).po and /dev/null differ
diff --git a/res/dsk/tetris PRODOS (san inc crack).po b/res/dsk/tetris PRODOS (san inc crack).po
new file mode 100644
index 000000000..5a5729f60
Binary files /dev/null and b/res/dsk/tetris PRODOS (san inc crack).po differ
diff --git a/src/4cade.a b/src/4cade.a
index 48aa29a6f..892031022 100644
--- a/src/4cade.a
+++ b/src/4cade.a
@@ -116,6 +116,8 @@ gGamesListStore
 SwitchToBank2
          +READ_RAM2_WRITE_RAM2
          rts
+MachineStatus
+         !byte 0                     ; SMC, fixed location for games to check it
          !word Reenter               ; NMI vector ($FFFA-B)
          !word Reenter               ; reset vector ($FFFC-D)
          !word Reenter               ; IRQ vector ($FFFE-F)
diff --git a/src/ui.common.a b/src/ui.common.a
index c08deeea1..51424b1fd 100644
--- a/src/ui.common.a
+++ b/src/ui.common.a
@@ -60,8 +60,7 @@ SoftBell
 ; out:   $0106..$011F clobbered
 ;------------------------------------------------------------------------------
 Home
-MachineStatus = *+1
-         lda   #$D1                  ; SMC
+         lda   MachineStatus
          and   #SUPPORTS_SHR
          beq   @noSHR
          lda   NEWVIDEO