diff --git a/src/4cade.a b/src/4cade.a
index 5e52054f3..6cee76d71 100644
--- a/src/4cade.a
+++ b/src/4cade.a
@@ -172,7 +172,7 @@ COPYSRC = *
          !source "src/hw.accel.lc2.a"
   STACKBASE = *
   LCRAM2_END = STACKBASE + 15
-  !if LCRAM2_END > DisableAccelerator {
+  !if LCRAM2_END >= DisableAccelerator {
     !error "code is too large: ends at ", LCRAM2_END
   }
   FONTDST = (LCRAM2_END + 255) and -256
@@ -191,7 +191,7 @@ EvenLasterMover
     !set PASS2=1
     !warn "ProRWTS ends at ", hdddataend - 1
     !warn "STACK at ", STACKBASE
-    !warn "LCRAM2 ends at ", LCRAM2_END - 1
+    !warn "LCRAM2 ends at ", LCRAM2_END
     !warn "RELBASE = ", $10000 - (LastMover - FirstMover)
   }
 }
diff --git a/src/constants.a b/src/constants.a
index 66a747667..99f2d9dc6 100644
--- a/src/constants.a
+++ b/src/constants.a
@@ -6,9 +6,9 @@
 ; YE OLDE GRAND UNIFIED MEMORY MAP
 ;
 ; LC RAM BANK 1
-; D000..E7E3 - persistent data structures (gGlobalPrefsStore, gGamesListStore)
+; D000..E7F9 - persistent data structures (gGlobalPrefsStore, gGamesListStore)
 ; ...unused...
-; E92B..FFF1 - main program code
+; E91E..FFF1 - main program code
 ; FFF2..FFF9 - API functions and global constants available for main program
 ;              code, prelaunchers, transition effects, &c.
 ;              (Wait/UnwaitForVBL, MockingboardStuff, MachineStatus)
@@ -17,9 +17,9 @@
 ; LC RAM BANK 2
 ; D000..D3FF - ProRWTS data
 ; D400..D66F - ProRWTS code
-; D670..DB9B - HGR font code & ProRWTS glue code
-; DB9C..DBAA - backup of stack (during gameplay and self-running demos)
-; ...unused...
+; D670..DBA2 - HGR font code & ProRWTS glue code
+; DBA3..DBB2 - backup of stack (during gameplay and self-running demos)
+; ...unused... yes, just one byte to spare
 ; DBB4..DBFF - (de)acceleration function
 ; DC00..DFFF - HGR font data
 ;------------------------------------------------------------------------------
@@ -141,3 +141,7 @@ IS_IIGS        = %00100000           ; /!\ do not use this to gate SHR, use SUPP
 HAS_VIDHD      = %00010000
 SUPPORTS_SHR   = %00110000
 CHEATS_ENABLED = %00001000
+
+; hacks
+LoadFileDirect = $DAFB
+launchpatch    = $D613
\ No newline at end of file
diff --git a/src/glue.launch.a b/src/glue.launch.a
index 75d7e9314..2016d8f70 100644
--- a/src/glue.launch.a
+++ b/src/glue.launch.a
@@ -253,4 +253,9 @@ PlayGame
          ; execution falls through here
 Launch
          jsr   SwitchToBank2
+         lda   #$BD
+         sta   launchpatch
+         jsr   saveslot              ; set proper slot information
+         lda   #$9D
+         sta   launchpatch
          jmp   LaunchInternal
diff --git a/src/glue.prorwts2.lc2.a b/src/glue.prorwts2.lc2.a
index 6d7d5ccbd..4ab01bddb 100644
--- a/src/glue.prorwts2.lc2.a
+++ b/src/glue.prorwts2.lc2.a
@@ -15,8 +15,8 @@ LoadFileAuxInternal
 !if RELBASE != $2000 {
   !ifdef PASS2 {
   } else { ;PASS2
-    !if * != $DAFD {
-      !error "LoadFileDirect=",*, ", adjust !if and fix Berzap"
+    !if * != LoadFileDirect {
+      !error "LoadFileDirect=",*, ", fix constants.a"
     }
   }
 }
diff --git a/src/prelaunch/berzap.a b/src/prelaunch/berzap.a
index a0cccd8e2..e4bb436e4 100644
--- a/src/prelaunch/berzap.a
+++ b/src/prelaunch/berzap.a
@@ -36,7 +36,7 @@ callback2
          pha
          lda   #<berzap_mb
          ldy   #>berzap_mb
-         jsr   $DAFD      ; ahem, LoadFileDirect
+         jsr   LoadFileDirect
          pla
          sta   $D403
          pla
diff --git a/src/prorwts2.a b/src/prorwts2.a
index b47ae0561..35f2dd2cf 100644
--- a/src/prorwts2.a
+++ b/src/prorwts2.a
@@ -2747,8 +2747,6 @@ encbufpatch1
       } ;allow_subdir = 1
       !if allow_aux = 0 {
                 rts
-      } else { ;allow_aux = 1
-                beq     hddrdwrdone
       } ;allow_aux = 0
     } ;one_shot = 0
   } else { ;aligned_read = 1
@@ -3264,6 +3262,13 @@ saveslot
                 lda     scrn_array, x
 initpatch       lda     ($48), y
                 pla
+
+!ifdef PASS2 {
+} else { ;PASS2
+  !if * != launchpatch {
+    !error "launchpatch=",*, ", fix constants.a"
+  }
+}
                 sta     scrn_array, x
                 inx
                 tya