Opty - thanks @Irgendwer

Atari/gr_basics.asm

@@ -463,20 +463,21 @@ Fast    ; Put char without coordinates check!
 
     ; and 8 bytes to the table
     ldy #7
+    ldx #$ff ; otimization - thanks @Irgendwer
 CopyChar
+    txa ; $ff
+    sta char2,y
     lda (fontind),y
     eor #$ff
     sta char1,y
-    lda #$ff
-    sta char2,y
     dey
     bpl CopyChar
     ; and 8 subsequent bytes as a mask
     adw fontind #8
     ldy #7
 CopyMask
-    lda (fontind),y
-    eor #$ff
+    txa ; $ff
+    eor (fontind),y
     sta mask1,y
     lda #$00
     sta mask2,y

C64/gr_basics.asm

@@ -344,20 +344,21 @@ Fast    ; Put char without coordinates check!
 
     ; and 8 bytes to the table
     ldy #7
+    ldx #$ff ; otimization - thanks @Irgendwer
 CopyChar
+    txa ; $ff
+    sta char2,y
     lda (fontind),y
     eor #$ff
     sta char1,y
-    lda #$ff
-    sta char2,y
     dey
     bpl CopyChar
     ; and 8 subsequent bytes as a mask
     adw fontind #8
     ldy #7
 CopyMask
-    lda (fontind),y
-    eor #$ff
+    txa ; $ff
+    eor (fontind),y
     sta mask1,y
     lda #$00
     sta mask2,y

grafproc.asm

@@ -584,11 +584,14 @@ UnequalTanks
 ;-------------------------------------------------
 .proc ClearTanks
     jsr PMoutofScreen
-    mva #1 Erase    ; erase tanks flag
+    lda #1     ; erase tanks flag
+    bne drawtanks.era
 .endp
 ;-------------------------------------------------
 .proc drawtanks
 ;-------------------------------------------------
+    lda #0    ; no erase tanks flag
+era sta Erase
     lda TankNr
     pha
     ldx #$00
@@ -604,7 +607,6 @@ DrawNextTank
     pla
     sta TankNr
 
-    mva #0 Erase    ; no erase tanks flag
     rts
 .endp
 ;---------