diff --git a/src/constants.a b/src/constants.a
index d527a87ac..825208f1b 100644
--- a/src/constants.a
+++ b/src/constants.a
@@ -9,14 +9,14 @@
 ; D000..E5F4 - persistent data structures (per-game cheat categories,
 ;              gGlobalPrefsStore, gGamesListStore)
 ; ...unused...
-; EAAE..FFF9 - main program code
+; EA5C..FFF9 - main program code
 ; FFFA..FFFF - NMI, reset, IRQ vectors
 ;
 ; LC RAM BANK 2
 ; D000..D3FF - ProRWTS data
 ; D400..D5FF - ProRWTS code
 ; D600..D9FF - HGR font data
-; DA00..DF83 - HGR font code & ProRWTS glue code
+; DA00..DF2F - HGR font code & ProRWTS glue code
 ; ...unused...
 ; DFF0..DFFF - backup of stack (during gameplay and self-running demos)
 ;------------------------------------------------------------------------------
diff --git a/src/glue.launch.a b/src/glue.launch.a
index 909c54791..7261fe989 100644
--- a/src/glue.launch.a
+++ b/src/glue.launch.a
@@ -216,10 +216,10 @@ gCurrentlyVisibleSlideshowIndex
 Launch
          jsr   SwitchToBank2
          jsr   SaveOrRestoreScreenHoles ; save screen hole contents
-         ldx   #$F1
--        lda   $100,x
-         sta   $DF00,x               ; back up stack
-         inx
+         ldy   #$F1
+-        lda   $100,y
+         sta   $DF00,y               ; back up stack
+         iny
          bne   -
          tsx                         ; back up stack pointer
          stx   $DFF0
@@ -231,5 +231,10 @@ Launch
          sta   $bf00,x
          dex
          bpl   -
+         tya
+         ldy   #$18
+-        sta   $bf57,y
+         dey
+         bne   -
          jmp   $106                  ; jump to pre-launch code
 }
diff --git a/src/prodos.impl.a b/src/prodos.impl.a
index 69970c5cd..99335a644 100644
--- a/src/prodos.impl.a
+++ b/src/prodos.impl.a
@@ -21,11 +21,8 @@ ProDOS_enter
 !set CloseHandles = @imp_close
     stx    ProDOS_savedX+1
     sty    ProDOS_savedY+1
-    pha
     jsr    @swap_zp
     pla
-    tax
-    pla
     tay
     pla
     sta    @fetchaddr+1
@@ -43,14 +40,11 @@ ProDOS_enter
     pha
     tya
     pha
-    php
-    txa
-    pha
 @request
     lda    #$d1
     cmp    #$80
     beq    @do_readblock
-    cmp    #$81 ;I don't remember if I used this, but it's cheap to add
+    cmp    #$81
     beq    @do_writeblock
     cmp    #$c4
     beq    @do_getattrib
@@ -69,9 +63,9 @@ ProDOS_enter
     cmp    #$ce
     beq    @do_seek
     cmp    #$d1
-    beq    @do_eof
-    ;;any others??
-    jmp    ProDOS_fatal
+    ;;bne    @do_fatal
+@do_eof
+    jmp    @imp_eof
 @do_readblock
 @do_writeblock
     jmp    @imp_rdwrblock
@@ -92,8 +86,8 @@ ProDOS_enter
     jmp    @restore_zp
 @do_seek
     jmp    @imp_seek
-@do_eof
-    jmp    @imp_eof
+@do_fatal
+    ;;jmp    ProDOS_fatal
 
 @imp_rdwrblock
     and    #$7f
@@ -345,15 +339,6 @@ ProDOS_enter
 
 @restore_zp
     jsr    @swap_zp
-    pla
-    lsr
-    lsr
-    lsr
-    lsr
-    and    #8
-    plp
-    adc    #0
-    tax
     jmp    ProDOS_exit
 
 @handle
@@ -492,54 +477,52 @@ promote
 !pseudopc $bf00 {
         php
         sei
-        lda    $c012
+        bit    $c083
         !byte  $24
   !if * != $bf06 {
     !error "$BF06 misplaced (",*,")"
   }
         rts ;clock interface, must be RTS on real ProDOS if program uses $20x
 
-        asl
-        lda    $c011
         bit    $c083
-        jmp    ProDOS_LC
-        !text  "4Q"
+        jmp    ProDOS_enter
+ProDOS_exit
+ProDOS_savedX
+        ldx    #$d1
+        plp
+        clc
+        bcc    ProDOS_savedY
   !if * != $bf13 {
     !error "$BF13 misplaced (",*,")"
   }
         !byte  $c1
         !word  $c2d1, $c3d1, $c4d1, $c5d1, $c6d1, $c7d1
-ProDOS_LC
-        bit    $c083
-        jmp    ProDOS_enter
-ProDOS_exit
-        sta    $c082, x
-ProDOS_savedX
-        ldx    #$d1
 ProDOS_savedY
         ldy    #$d1
-        plp
-        clc
-        !byte  $24
-ProDOS_unit
-  !if * != $bf30 {
-    !error "$BF30 misplaced (",*,")"
-  }
-        !byte  $d1
-
+        sta    $c081
         lda    #0
         rts
 
+ProDOS_unit
+  !if * > $bf30 {
+    !error "$BF30 misplaced (",*,")"
+  } else {
+    !if * != $bf30 {
+        !fill  $bf30-*
+    }
+  }
+        !byte  $d1
+
 ProDOS_fatal ;only for debugging, will be removed
-        bit    $c081
-        pha
-        jsr    $fe89
-        jsr    $fe93
-        pla
-        jsr    $fdda
-        jmp    $ff65
-*=$bf58
-        !fill  $18
+;;        bit    $c081
+;;        pha
+;;        jsr    $fe89
+;;        jsr    $fe93
+;;        pla
+;;        jsr    $fdda
+;;        jmp    $ff65
+;;*=$bf58
+;;        !fill  $18 ;filled by init instead
 
 ProDOS_prefix=$bfd0
 ;        !fill  $2e