diff --git a/gscats.2mg b/gscats.2mg
index ecb8390..fafc475 100644
Binary files a/gscats.2mg and b/gscats.2mg differ
diff --git a/gscats.s b/gscats.s
index bb04d9e..4a291e7 100644
--- a/gscats.s
+++ b/gscats.s
@@ -40,32 +40,15 @@ mainGameLoop:
 
 	jsr syncVBL
 
-;	lda scrollV
-;	bmi negV
-
-;	clc
-;	lda mapScrollPos
-;	adc scrollV
-;	cmp #COMPILEDTERRAINROW-80
-;	beq reverseScroll
-;	sta mapScrollPos
-	bra render
-
-negV:
-	clc
-	lda mapScrollPos
-	adc scrollV
-	beq reverseScroll
-	sta mapScrollPos
-
-render:
-	tay
 	jsr renderTerrain
 	jsr kbdScan
 
 	lda mapScrollRequested
 	bpl scrollMap
 
+	lda angleDeltaRequested
+	bne changeAngle
+
 	lda #gameobjectData
 	sta PARAML0
 	jsr renderGameobject
@@ -82,7 +65,6 @@ scrollMap:
 
 	sta mapScrollPos
 	asl
-	asl
 	sta leftScreenEdge
 
 	jsr clipTerrain
@@ -90,6 +72,17 @@ scrollMap:
 	sta mapScrollRequested
 	jmp mainGameLoop
 
+changeAngle:
+	ldy #0
+	tax
+	jsr playerDeltaAngle
+
+	ldy #0
+	jsr renderPlayerHeader
+
+	stz angleDeltaRequested
+	jmp mainGameLoop
+
 reverseScroll:
 	lda scrollV
 	eor #$ffff
@@ -117,12 +110,14 @@ kbdScanLoop:
 
 	cmp #(8 + $80)
 	beq kbdScanLeftArrow
-
 	cmp #(21 + $80)
 	beq kbdScanRightArrow
-
-	cmp #(32 + $80)
+	cmp #(' ' + $80)
 	beq kbdScanSpace
+	cmp #('a' + $80)
+	beq kbdScanA
+	cmp #('z' + $80)
+	beq kbdScanZ
 
 kbdScanDone:
 	NATIVE
@@ -153,6 +148,17 @@ kbdScanSpace:
 	sta quitRequested
 	rts
 
+kbdScanA:
+	NATIVE
+	lda #1
+	sta angleDeltaRequested
+	rts
+
+kbdScanZ:
+	NATIVE
+	lda #-1
+	sta angleDeltaRequested
+	rts
 
 
 
@@ -162,6 +168,8 @@ quitRequested:
 	.word $0000
 mapScrollRequested:
 	.word $FFFF
+angleDeltaRequested:
+	.word $0000
 
 
 ; Position of map viewing window. Can be visualized in two ways:
diff --git a/player.s b/player.s
index 87c0fd9..e4bc392 100644
--- a/player.s
+++ b/player.s
@@ -14,6 +14,48 @@ playerData:
 	.word 45		; Angle in degrees from +X
 	.word 50		; Power
 
+PD_ANGLE = 4	; Byte offsets into player data structure
+PD_POS = 6
+
+.macro PLAYERPTR_Y
+	tya		; Pointer to player structure from index
+	asl
+	asl
+	asl
+	tay
+.endmacro
+
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+; playerDeltaAngle
+;
+; Y = Player index
+; X = Delta
+;
+playerDeltaAngle:
+	SAVE_AXY
+	PLAYERPTR_Y
+
+	txa
+	clc
+	adc playerData+PD_ANGLE,y
+	bmi playerDeltaAngleClampLow
+	cmp #180
+	bpl playerDeltaAngleClampHigh
+
+playerDeltaAngleStore:
+	sta playerData+PD_ANGLE,y
+	RESTORE_AXY
+	rts
+
+playerDeltaAngleClampLow:
+	lda #0
+	bra playerDeltaAngleStore
+
+playerDeltaAngleClampHigh:
+	lda #180
+	bra playerDeltaAngleStore
+
 
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 ; renderPlayerHeader
@@ -22,18 +64,13 @@ playerData:
 ;
 renderPlayerHeader:
 	SAVE_AXY
-
-	tya		; Index to player structure
-	asl
-	asl
-	asl
-	tay
+	PLAYERPTR_Y
 
 	ldx #0
 	lda #angleStr
 	jsr DrawString
 
-	lda playerData+4,y
+	lda playerData+PD_ANGLE,y
 	ldx #24
 	jsr drawNumber
 
@@ -41,4 +78,4 @@ renderPlayerHeader:
 	rts
 
 angleStr:
-	pstring "ANGLE:"
+	pstring "ANGLE:   "
diff --git a/utility.s b/utility.s
index 092db98..f654a59 100644
--- a/utility.s
+++ b/utility.s
@@ -69,6 +69,7 @@ intToStringFullDigitsLoop:
 	lsr
 	lsr
 	lsr
+	clc
 	adc #'0'
 	sta intToStringResult,y
 	iny