diff --git a/scorch.asm b/scorch.asm
index f03b425..16efc67 100644
--- a/scorch.asm
+++ b/scorch.asm
@@ -175,14 +175,14 @@ START
     jsr Options  ;startup screen
 	mva #0 dmactls		; dark screen
 	jsr WaitOneFrame
-    lda escFlag
-    bne START
+    bit escFlag
+    bmi START
 
     jsr EnterPlayerNames
 	mva #0 dmactls		; dark screen
 	jsr WaitOneFrame
-    lda escFlag
-    bne START
+    bit escFlag
+    bmi START
 
     jsr RandomizeSequence
     ; for the round #1 shooting sequence is random
@@ -199,8 +199,9 @@ MainGameLoop
     jsr RoundInit
     
     jsr MainRoundLoop
-    lda escFlag
-    bne START
+    bit escFlag
+    bmi START
+	jvs GoGameOver
     
     mva #0 TankNr  ; 
     
@@ -316,6 +317,7 @@ eskipzeroing
 
     lda GameIsOver
 	beq NoGameOverYet
+GoGameOver
 	mva #0 dmactls		; dark screen
 	jsr WaitOneFrame
 	jsr GameOverScreen
@@ -514,8 +516,8 @@ RoboTanks
     cmp #28  ; ESC
     bne @+
       jsr AreYouSure
-      lda escFlag
-      seq:rts
+      bit escFlag
+	  spl:rts
 @
 
     jmp AfterManualShooting
@@ -525,7 +527,7 @@ ManualShooting
     jsr WaitForKeyRelease
     jsr BeforeFire
     lda escFlag
-    seq:rts
+    seq:rts		; keys Esc or O
 
 AfterManualShooting
     mva #0 plot4x4color
@@ -1459,7 +1461,7 @@ nextishigher
       and #$3f ;CTRL and SHIFT ellimination
       cmp #28  ; ESC
       bne getkeyend
-        mvx #1 escFlag
+        mvx #$80 escFlag
       bne getkeyend
 
 checkJoyGetKey
diff --git a/scorch.xex b/scorch.xex
index 115752d..d490e93 100644
Binary files a/scorch.xex and b/scorch.xex differ
diff --git a/textproc.asm b/textproc.asm
index 624071c..55311dd 100644
--- a/textproc.asm
+++ b/textproc.asm
@@ -63,8 +63,8 @@
 OptionsMainLoop
     jsr OptionsInversion
     jsr getkey
-    ldx escFlag
-    seq:rts
+    bit escFlag
+    spl:rts
        
     cmp #$f  ;cursor down
     bne OptionsNoDown
@@ -255,7 +255,7 @@ OptionsYLoop
 ManualPurchase
       jsr Purchase
       ldx escFlag
-      seq:rts
+      spl:rts
 AfterManualPurchase
 
       inc:lda TankNr
@@ -658,8 +658,8 @@ ChoosingItemForPurchase
     
     jsr PutLitteChar ; Places pointer at the right position
     jsr getkey
-    ldx escFlag
-    seq:jmp WaitForKeyRelease  ; like jsr ... : rts
+    bit escFlag
+    spl:jmp WaitForKeyRelease  ; like jsr ... : rts
     cmp #$2c ; Tab
     jeq ListChange
     cmp #$06  ; cursor left
@@ -1025,8 +1025,8 @@ NoArrowDown
       lda TankStatusColoursTable,x
       sta colpf2s  ; set color of player name line
       jsr EnterPlayerName
-      lda escFlag
-      seq:rts
+      bit escFlag
+      spl:rts
       inc TankNr
       lda TankNr
       cmp NumberOfPlayers
@@ -1085,8 +1085,8 @@ endOfTankName
 
 CheckKeys
     jsr getkey
-    ldx escFlag
-    seq:rts
+    bit escFlag
+    spl:rts
     
     ; is the char to be recorded?
     ldx #keycodesEnd-keycodes ;table was 38 chars long
@@ -1614,11 +1614,11 @@ EndOfTypeLine4x4
     jsr GetKey
     cmp #$2b  ; "Y"
     bne @+
-    mva #1 escFlag
+    mva #$80 escFlag
     bne skip01
 @    mva #0 escFlag
-     jsr WaitForKeyRelease
 skip01
+    jsr WaitForKeyRelease
     
     ;clean
     mva #3 di
diff --git a/variables.asm b/variables.asm
index 4ca5481..4e367e8 100644
--- a/variables.asm
+++ b/variables.asm
@@ -352,7 +352,7 @@ TankTempY
 ;----------------------------------------------------
 singleRoundVars
 ;-------------- 
-escFlag .ds 1
+escFlag .ds 1	; 0 - Esc or O not pressed, $80 - Esc pressed, $40 - O pressed
 ;-------------- 
 CurrentResult
     .DS 1
diff --git a/weapons.asm b/weapons.asm
index e29d5f6..a04e04c 100644
--- a/weapons.asm
+++ b/weapons.asm
@@ -1191,11 +1191,20 @@ notpressed
     lda kbcode
     and #%10111111 ; SHIFT elimination
 
+    cmp #$08  ; O
+    bne @+
+    jsr AreYouSure
+    bit escFlag
+    bpl notpressed
+    ;---O pressed-quit game to game over screen---
+	mva #$40 escFlag
+    rts
+@
     cmp #28  ; ESC
     bne @+
     jsr AreYouSure
-    lda escFlag
-    beq notpressed
+    bit escFlag
+    bpl notpressed
     ;---esc pressed-quit game---
     rts