diff --git a/asm/doorrando.asm b/asm/doorrando.asm
index d5788d22..f8a4b5a3 100644
--- a/asm/doorrando.asm
+++ b/asm/doorrando.asm
@@ -4,8 +4,8 @@
 !blt = "bcc"
 
 ; Free RAM notes
-; Normal doors use $FE for scrolling indicator
-; Normal doors use $AB to store the trap door indicator
+; Normal doors use $AB-AC for scrolling indicator
+; Normal doors use $FE to store the trap door indicator
 ; Spiral doors use $045e to store stair type
 ; Gfx uses $b1 to for sub-sub-sub-module thing
 
@@ -20,6 +20,7 @@ incsrc gfx.asm
 incsrc keydoors.asm
 incsrc overrides.asm
 incsrc edges.asm
+incsrc math.asm
 warnpc $279000
 
 ; Data Section
diff --git a/asm/doortables.asm b/asm/doortables.asm
index e9000f5c..2aed2bf3 100644
--- a/asm/doortables.asm
+++ b/asm/doortables.asm
@@ -497,7 +497,7 @@ db $00,$80,$11, $00,$80,$11, $00,$80,$11, $00,$80,$11
 db $00,$80,$11, $00,$80,$11, $00,$80,$11, $00,$80,$11
 db $00,$80,$11, $00,$80,$11, $00,$80,$11
 SouthOpenEdge:
-db $00,$80,$11, $00,$80,$11, $00,$80,$11, $00,$80,$11
+db $83,$a2,$11, $00,$80,$11, $00,$80,$11, $00,$80,$11
 db $00,$80,$11, $00,$80,$11, $00,$80,$11, $00,$80,$11
 db $00,$80,$11, $00,$80,$11, $00,$80,$11
 WestOpenEdge:
@@ -538,4 +538,6 @@ db $40,$20,$30 ; DP North Hall
 db $68,$10,$60, $84,$18,$78 ; HC Guards
 db $a0,$a0,$50 ; DP Main Lobby
 db $58,$50,$30, $98,$50,$70 ; TT Ambush
-db $58,$50,$30 ; TT Nook
\ No newline at end of file
+db $58,$50,$30 ; TT Nook
+MultDivInfo: ; (1placeholder, 1, 2, 3, 4, 5, 6, 10, 20)
+db $01, $01, $02, $03, $04, $05, $06, $0a, $14
\ No newline at end of file
diff --git a/asm/edges.asm b/asm/edges.asm
index 54454179..69a23809 100644
--- a/asm/edges.asm
+++ b/asm/edges.asm
@@ -3,7 +3,7 @@ HorzEdge:
         jsr DetectWestEdge : bra ++
     + jsr DetectEastEdge
     ++ cmp #$ff : beq +
-        sta $00 : asl : !add $00: tax
+        sta $00 : asl : !add $00 : tax
         cpy #$ff : beq ++
             jsr LoadWestData : bra .main
         ++ jsr LoadEastData
@@ -22,14 +22,10 @@ VertEdge:
             jsr LoadNorthData : bra .main
         ++ jsr LoadSouthData
         .main
-        ; todo: work to do
+        jsr LoadEdgeRoomVert
         sec : rts
     + clc : rts
 
-; todo: LoadVert
-; todo: FixAdjustTrans
-; todo: Fix ab fe swap in normal
-
 LoadEdgeRoomHorz:
     lda $03 : sta $a0
     sty $09
@@ -44,11 +40,12 @@ LoadEdgeRoomHorz:
     ++
     lda $00 : sta $21 : sta $0601 : sta $0605
     lda $01 : sta $aa : lsr : sta $01 : stz $00
+    lda $0a : sta $20
 
     stz $0e
     rep #$30
-    lda $e8 : sta $02
-    lda $06 : and #$00ff : !add $00 : sta $00
+    lda $e8 : and #$01ff : sta $02
+    lda $0a : and #$00ff : !add $00 : sta $00
 
     cmp #$006c : !bge +
         lda #$0077 : bra ++
@@ -68,51 +65,116 @@ LoadEdgeRoomHorz:
     cmp $02 : bne +
         lda #$0000 : bra .done
     + !blt +
-        !sub $02 : bra .done
-    + lda $02 : !sub $00 : inc $0e
+        !sub $02 : inc $0e : bra .done
+    + lda $02 : !sub $00
 
     .done sta $ab : sep #$30
     lda $0e : asl : ora $ac : sta $ac
-    lda $0601 : sta $e9
+    lda $0603 : sta $e9
 
     lda $04 : and #$80 : lsr #4 : sta $ee ; layer stuff
     rts
 
+LoadEdgeRoomVert:
+    lda $03 : sta $a0
+    sty $09
+    and.b #$f0 : lsr #3 : !sub $21 : !add $09 : sta $02
+    ldy #$01 : jsr ShiftVariablesMainDir
+    lda $a0 : and.b #$0f : asl : sta $060b : inc : sta $060f
+
+
+    lda $04 : and #$20 : bne +
+        lda $60b : sta $00 : stz $01 : bra ++
+    +   lda $60f : sta $00 : lda #$01 : sta $01
+    ++ ; $01 now contains 0 or 1
+    lda $00 : sta $23 : sta $0609 : sta $060d
+    lda $01 : sta $a9 : stz $00 ; setup for 16 bit ops
+    lda $0a : sta $22
+
+    stz $0e ; pos/neg indicator
+    rep #$30
+    lda $e2 : and #$01ff : sta $02
+    lda $0a : and #$00ff : !add $00 : sta $00
+
+    cmp #$0078 : !bge +
+        lda #$007f : bra ++
+    + cmp #$0178 : !blt +
+        lda #$017f : bra ++
+    + !add #$0007
+    ++ sta $061c : inc #2 : sta $061e
+
+    lda $00 : cmp #$0078 : !bge +
+        lda #$0000 : bra ++
+    + cmp #$0178 : !blt +
+        lda #$0100 : bra ++
+    + !sub #$0078
+    ++ sta $00
+
+    ; figures out scroll amt
+    cmp $02 : bne +
+        lda #$0000 : bra .done
+    + !blt +
+        !sub $02 : inc $0e : bra .done
+    + lda $02 : !sub $00
+
+    .done sta $ab : sep #$30
+    lda $0e : asl : ora $ac : sta $ac
+    lda $060b : sta $e3
+
+    lda $04 : and #$10 : lsr #4 : sta $ee ; layer stuff
+    rts
+
 
 LoadNorthData:
-    lda NorthEdgeInfo x, sta $06
-    lda NorthEdgeInfo x+1, sta $07
-    lda NorthEdgeInfo x+2, sta $08
-    lda NorthOpenEdge x, sta $03
-    lda NorthOpenEdge x+1, sta $04
-    lda NorthOpenEdge x+2, sta $05
+    lda NorthEdgeInfo, x : sta $06 ; not needed I think
+    lda NorthOpenEdge, x : sta $03 : inx
+    lda NorthEdgeInfo, x : sta $07 ;probably needed for maths - unsure
+    lda NorthOpenEdge, x : sta $04 : inx
+    lda NorthEdgeInfo, x : sta $08 ; needed for maths
+    lda NorthOpenEdge, x : sta $05
+    lda $04 : and #$0f : sta $00 : asl : !add $00 : tax
+    lda SouthEdgeInfo, x : sta $0a : inx ; needed now, and for nrml transition
+    lda SouthEdgeInfo, x : sta $0b : inx ; probably not needed - unsure
+    lda SouthEdgeInfo, x : sta $0c ; needed for maths
     rts
 
 LoadSouthData:
-    lda SouthEdgeInfo x, sta $06
-    lda SouthEdgeInfo x+1, sta $07
-    lda SouthEdgeInfo x+2, sta $08
-    lda SouthOpenEdge x, sta $03
-    lda SouthOpenEdge x+1, sta $04
-    lda SouthOpenEdge x+2, sta $05
+    lda SouthEdgeInfo, x : sta $06
+    lda SouthOpenEdge, x : sta $03 : inx
+    lda SouthEdgeInfo, x : sta $07
+    lda SouthOpenEdge, x : sta $04 : inx
+    lda SouthEdgeInfo, x : sta $08
+    lda SouthOpenEdge, x : sta $05
+    lda $04 : and #$0f : sta $00 : asl : !add $00 : tax
+    lda NorthEdgeInfo, x : sta $0a : inx
+    lda NorthEdgeInfo, x : sta $0b : inx
+    lda NorthEdgeInfo, x : sta $0c
     rts
 
 LoadWestData:
-    lda WestEdgeInfo x, sta $06
-    lda WestEdgeInfo x+1, sta $07
-    lda WestEdgeInfo x+2, sta $08
-    lda WestOpenEdge x, sta $03
-    lda WestOpenEdge x+1, sta $04
-    lda WestOpenEdge x+2, sta $05
+    lda WestEdgeInfo, x : sta $06
+    lda WestOpenEdge, x : sta $03 : inx
+    lda WestEdgeInfo, x : sta $07
+    lda WestOpenEdge, x : sta $04 : inx
+    lda WestEdgeInfo, x : sta $08
+    lda WestOpenEdge, x : sta $05
+    lda $04 : and #$0f : sta $00 : asl : !add $00 : tax
+    lda EastEdgeInfo, x : sta $0a : inx
+    lda EastEdgeInfo, x : sta $0b : inx
+    lda EastEdgeInfo, x : sta $0c
     rts
 
 LoadEastData:
-    lda EastEdgeInfo x, sta $06
-    lda EastEdgeInfo x+1, sta $07
-    lda EastEdgeInfo x+2, sta $08
-    lda EastOpenEdge x, sta $03
-    lda EastOpenEdge x+1, sta $04
-    lda EastOpenEdge x+2, sta $05
+    lda EastEdgeInfo, x : sta $06
+    lda EastOpenEdge, x : sta $03 : inx
+    lda EastEdgeInfo, x : sta $07
+    lda EastOpenEdge, x : sta $04 : inx
+    lda EastEdgeInfo, x : sta $08
+    lda EastOpenEdge, x : sta $05
+    lda $04 : and #$0f : sta $00 : asl : !add $00 : tax
+    lda WestEdgeInfo, x : sta $0a : inx
+    lda WestEdgeInfo, x : sta $0b : inx
+    lda WestEdgeInfo, x : sta $0c
     rts
 
 
@@ -142,7 +204,7 @@ DetectNorthEdge:
         ++ ldx #$07 : bra .end
     + cmp #$dc : bne .end
         lda $a9 : bne ++
-            lda $22 : bcs #$b0 : bcs ++
+            lda $22 : cmp #$b0 : bcs ++
                 ldx #$09 : bra .end
         ++ ldx #$0a
     .end txa : rts
@@ -173,7 +235,7 @@ DetectSouthEdge:
         ++ ldx #$07 : bra .end
     + cmp #$cc : bne .end
         lda $a9 : bne ++
-            lda $22 : bcs #$b0 : bcs ++
+            lda $22 : cmp #$b0 : bcs ++
                 ldx #$09 : bra .end
         ++ ldx #$0a
     .end txa : rts
diff --git a/asm/math.asm b/asm/math.asm
new file mode 100644
index 00000000..3ea48668
--- /dev/null
+++ b/asm/math.asm
@@ -0,0 +1,61 @@
+;divide by 2 example
+;    0   1   2   3   4   5   6   7   8   9   a   b   c   d   e   f  10--Offset Ruler
+;v  00  01  01  02  02  03  03  04  04  04  05  05  06  06  07  07  08
+
+;divide by 3 example
+; 0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f 10 11 12 13 14 15 16 17 18
+;00 00 01 01 01 02 02 02 03 03 03 04 04 04 05 05 05 06 06 06 07 07 07 08 08
+
+MultiplyByY:
+.loop cpy #$0001 : beq .done
+cpy #$0003 : bne ++
+    jsr MultiBy3 : bra .done
+++ cpy #$0005 : bne ++
+    jsr MultiBy5 : bra .done
+++ asl : sta $00 : tya : lsr : tay : lda $00 : bra .loop
+.done rts
+
+;todo -- width in X?
+DivideByY:
+.loop cpy #$0001 : beq .done
+cpy #$0003 : bne ++
+    jsr DivideBy3 : bra .done
+++ cpy #$0005 : bne ++
+    jsr DivideBy5 : bra .done
+; todo -- alter - width
+++ tyx : jsr DivideBy2 : sta $00 : tya : lsr : tay : lda $00 : bra .loop
+.done rts
+
+MultiBy3:
+sta $00 : asl : !add $00
+rts
+
+MultiBy5:
+sta $00 : asl #2 : !add $00
+rts
+
+;width of divison in x
+DivideBy2:
+sta $00
+lsr : bcc .done
+sta $02 : txa : lsr : cmp $00 : !bge .done
+lda $02 : inc
+.done rts
+
+DivideBy3:
+sta $00
+ldx #$0000
+lda #$0002
+.loop cmp $00 : !bge .store
+    inx : !add #$0003 : bra .loop
+.store txa
+rts
+
+DivideBy5:
+sta $00
+ldx #$0000
+lda #$0003
+.loop cmp $00 : !bge .store
+    inx : !add #$0005 : bra .loop
+.store txa
+rts
\ No newline at end of file
diff --git a/asm/normal.asm b/asm/normal.asm
index c32eb1d5..fde06011 100644
--- a/asm/normal.asm
+++ b/asm/normal.asm
@@ -89,6 +89,7 @@ LoadRoomHorz:
 	jsr ShiftQuad
 	jsr ShiftCameraBounds
 	ldy #$01 : jsr ShiftVariablesSubDir ; flip direction
+	jsr SetupScrollIndicator
 	lda $01 : sta $fe : and #$04 : lsr #2
 	sta $ee
 	lda $01 : and #$10 : beq .end : stz $0468
@@ -116,6 +117,7 @@ LoadRoomVert:
 	jsr ShiftQuad
 	jsr ShiftCameraBounds
 	ldy #$00 : jsr ShiftVariablesSubDir ; flip direction
+	jsr SetupScrollIndicator
 	lda $01 : sta $fe : and #$04 : lsr #2
 	sta $ee
 	.end
@@ -123,6 +125,12 @@ LoadRoomVert:
 	rts
 }
 
+SetupScrollIndicator:
+    lda $ab : and #$01 : asl : sta $ac
+    lda $ab : and #$40 : clc : rol #3 : ora $ac : sta $ac
+    lda $ab : and #$20 : asl #2 : sta $ab
+    rts
+
 LookupNewRoom: ; expects data offset to be in A
 {
     rep #$30 : and #$00FF ;sanitize A reg (who knows what is in the high byte)
@@ -157,7 +165,7 @@ ShiftLowCoord:
 {
 	lda $01 : and.b #$03 ; high byte index
 	jsr CalcOpposingShift
-	lda $fe : and.b #$f0 : cmp.b #$20 : bne .lowDone
+	lda $ab : and.b #$f0 : cmp.b #$20 : bne .lowDone
 	lda OppCoordIndex,y : tax
 	lda #$80 : !add $20,x : sta $20,x
 	.lowDone
@@ -165,13 +173,13 @@ ShiftLowCoord:
 }
 
 ; expects A to be (0,1,2) (dest number) and (0,1,2) (src door number) to be stored in $04
-; $0127 will be set to a bitmask aaaa qxxf
+; $ab will be set to a bitmask aaaa qxxf
 ; a - amount of adjust
 ; f - flag, if set, then amount is pos, otherwise neg.
 ; q - quadrant, if set, then quadrant needs to be modified
 CalcOpposingShift:
 {
-	stz $fe ; set up (can you zero out 127 alone?)
+	stz $ab : stz $ac ; set up
 	cmp.b $04 : beq .noOffset ; (equal, no shifts to do)
 	phy : tay ; reserve these
 	lda $04 : tax : tya : !sub $04 : sta $04 : cmp.b #$00 : bpl .shiftPos
@@ -179,8 +187,8 @@ CalcOpposingShift:
 	cpx.b #$01 : beq .skipNegQuad
 	ora #$08
 	.skipNegQuad
-	sta $fe : lda $04 : cmp.b #$FE : beq .done ;already set $0127
-	lda $fe : eor #$60
+	sta $ab : lda $04 : cmp.b #$FE : beq .done ;already set $ab
+	lda $ab : eor #$60
 	bra .setDone
 
 	.shiftPos
@@ -188,10 +196,10 @@ CalcOpposingShift:
 	cpy.b #$01 : beq .skipPosQuad
 	ora #$08
 	.skipPosQuad
-	sta $fe : lda $04 : cmp.b #$02 : bcs .done ;already set $0127
-	lda $fe : eor #$60
+	sta $ab : lda $04 : cmp.b #$02 : bcs .done ;already set $ab
+	lda $ab : eor #$60
 
-	.setDone  sta $fe
+	.setDone  sta $ab
 	.done     ply
 	.noOffset rts
 }
@@ -199,9 +207,9 @@ CalcOpposingShift:
 
 ShiftQuad:
 {
-	lda $fe : and #$08 : cmp.b #$00 : beq .quadDone
+	lda $ab : and #$08 : beq .quadDone
 	lda ShiftQuadIndex,y : tax ; X should be set to either 1 (vertical) or 2 (horizontal) (for a9,aa quadrant)
-	lda $fe : and #$01 : cmp.b #$00 : beq .decQuad
+	lda $ab : and #$01 : beq .decQuad
 	inc $02
 	txa : sta $a8, x ; alter a9/aa
 	bra .quadDone
@@ -229,8 +237,8 @@ ShiftCameraBounds:
 {
 	lda CamBoundIndex,y : tax ; should be 0 for horz travel (vert bounds) or 4 for vert travel (horz bounds)
 	rep #$30
-	lda $fe : and #$00f0 : asl #2 : sta $06
-	lda $fe : and #$0001 : cmp #$0000 : beq .subIt
+	lda $ab : and #$00f0 : asl #2 : sta $06
+	lda $ab : and #$0001 : cmp #$0000 : beq .subIt
 	lda $0618, x : !add $06 : sta $0618, x
 	lda $061A, x : !add $06 : sta $061A, x
 	sep #$30
@@ -244,19 +252,26 @@ ShiftCameraBounds:
 
 AdjustTransition:
 {
-	lda $fe : and #$00f0 : lsr
-	sep #$20 : cmp $0126 : bcc .reset
-	rep #$20
+	lda $ab : and #$01ff : beq .reset
 	phy : ldy #$06 ; operating on vertical registers during horizontal trans
 	cpx.b #$02 : bcs .horizontalScrolling
 	ldy #$00  ; operate on horizontal regs during vert trans
 	.horizontalScrolling
-	lda $fe : and #$0001 : asl : tax
-	lda.l OffsetTable,x : adc $00E2,y : and.w #$FFFE : sta $00E2,y : sta $00E0,y
+	cmp #$0008 : bcs +
+	    pha : lda $ab : and #$0200 : beq ++
+	        pla : bra .add
+	    ++ pla : eor #$ffff : inc ; convert to negative
+	    .add jsr AdjustCamAdd : ply : bra .reset
+	+ lda $ab : and #$0200 : xba : tax
+	lda.l OffsetTable,x : jsr AdjustCamAdd
+	lda $ab : !sub #$0008 : sta $ab
 	ply : bra .done
 	.reset ; clear the $ab variable so to not disturb intra-tile doors
-	stz $fe
+	stz $ab
 	.done
-	rep #$20 : lda $00 : and #$01fc
+	lda $00 : and #$01fc
 	rtl
-}
\ No newline at end of file
+}
+
+AdjustCamAdd:
+    !add $00E2,y : sta $00E2,y : sta $00E0,y : rts
\ No newline at end of file