diff --git a/gr-sim/tfv_flying_6502.c b/gr-sim/tfv_flying_6502.c
index dbe54eb5..16f8d142 100644
--- a/gr-sim/tfv_flying_6502.c
+++ b/gr-sim/tfv_flying_6502.c
@@ -783,12 +783,12 @@ static void draw_background_mode7(void) {
 		fixed_mul(CONST_LOWRES_HALF_I,CONST_LOWRES_HALF_F,
 			ram[DX_I],ram[DX_F],
 			&ram[TEMP_I],&ram[TEMP_F],0);
-							cycles.mode7+=40;
+							cycles.mode7+=38;
 
 		fixed_add(ram[SPACEX_I],ram[SPACEX_F],
 			ram[TEMP_I],ram[TEMP_F],
 			&ram[SPACEX_I],&ram[SPACEX_F]);
-							cycles.mode7+=20;
+							cycles.mode7+=16;
 		if (!displayed) {
 			printf("SPACEX! %x:%x\n",
 			ram[SPACEX_I],ram[SPACEX_F]);
@@ -802,13 +802,14 @@ static void draw_background_mode7(void) {
 		fixed_add(ram[SPACEY_I],ram[SPACEY_F],
 			ram[TEMP_I],ram[TEMP_F],
 			&ram[SPACEY_I],&ram[SPACEY_F]);
-							cycles.mode7+=22;
+							cycles.mode7+=16;
 		if (!displayed) {
 			printf("SPACEY! %x:%x\n",ram[SPACEY_I],ram[SPACEY_F]);
 		}
 
 		// go through all points in this screen line
-		ram[SCREEN_X] = 0;
+		ram[SCREEN_X] = LOWRES_W;
+							cycles.mode7+=2;
 
 		while(1) {
 			// get a pixel from the tile and put it on the screen
@@ -842,8 +843,8 @@ match:
 				ram[DY_I],ram[DY_F],
 				&ram[SPACEY_I],&ram[SPACEY_F]);
 
-			ram[SCREEN_X]++;
-			if (ram[SCREEN_X] >= LOWRES_W) break;
+			ram[SCREEN_X]--;
+			if (ram[SCREEN_X]== 0) break;
 							cycles.mode7+=41;
 
 
diff --git a/tfv/OPTIMIZATION b/tfv/OPTIMIZATION
index f4042697..68343e8b 100644
--- a/tfv/OPTIMIZATION
+++ b/tfv/OPTIMIZATION
@@ -218,12 +218,13 @@ This looks like a pessimization, but it's because the cycle counting code
 	Cycles: getkey=              46
 	Cycles: page_flip=           26
 	Cycles: multiply=        40,680
-	Cycles: mode7=          115,470
+	Cycles: mode7=          115,150
 	Cycles: lookup_map=      22,747
 	Cycles: put_sprite=       2,561
 	================================
-	Total =                 181,717
-	Frame Rate = 5.50 fps
+	Total =                 181,397
+	Frame Rate = 5.51 fps
+
 
 
 Each cycle removed from inner X loop saves
diff --git a/tfv/tfv_flying.s b/tfv/tfv_flying.s
index 0f92ef2c..d1fad4e6 100644
--- a/tfv/tfv_flying.s
+++ b/tfv/tfv_flying.s
@@ -885,10 +885,10 @@ spacez_shifted:
 								;==========
 								;	 16
 ; mul7
-	; fixed_mul(&temp,&dx,&temp);
-	lda	#CONST_LOWRES_HALF_I					; 3
+	; fixed_mul(&lowres_half,&dx,&temp);
+	lda	#CONST_LOWRES_HALF_I					; 2
 	sta	NUM1H							; 3
-	lda	#CONST_LOWRES_HALF_F					; 3
+	lda	#CONST_LOWRES_HALF_F					; 2
 	sta	NUM1L							; 3
 	lda	DX_I							; 3
 	sta	NUM2H							; 3
@@ -896,26 +896,24 @@ spacez_shifted:
 	lda	DX_F							; 3
 	sta	dxf_label+1	; for self modify			; 4
 	sta	NUM2L							; 3
-	sec								; 2
+	sec			; don't reuse previous num1		; 2
 	jsr	multiply						; 6
-;	stx	TEMP_I							;
-;	sta	TEMP_F							;
+				; TEMP_I in X				;
+				; TEMP_F in A				;
 								;==========
-								;	 40
+								;	 38
 
 
-
-	clc		; fixed_add(&space_x,&temp,&space_x);		; 2
-	lda	SPACEX_F						; 3
-;	adc	TEMP_F							;
-	adc	RESULT+1						; 3
+	; fixed_add(&space_x,&temp,&space_x);
+	clc								; 2
+				; TEMP_F in A
+	adc	SPACEX_F						; 3
 	sta	SPACEX_F						; 3
-	lda	SPACEX_I						; 3
-;	adc	TEMP_I							; 
-	adc	RESULT+2						; 3
+	txa			; TEMP_I in X				; 2
+	adc	SPACEX_I						; 3
 	sta	SPACEX_I						; 3
 								;==========
-								;	 20
+								;	 16
 
 ;mul8
 	; fixed_mul(&fixed_temp,&dy,&fixed_temp);
@@ -925,28 +923,30 @@ spacez_shifted:
 	lda	DY_F							; 3
 	sta	NUM2L							; 3
 	sta	dyf_label+1	; for self modify			; 4
-	clc	; reuse LOWRES_HALF_I from last time			; 2
+	clc	; reuse CONST_LOWRES_HALF from last time		; 2
 	jsr	multiply						; 6
-;	stx	TEMP_I							;
-;	sta	TEMP_F							;
+			; TEMP_I in X
+			; TEMP_F in A
 								;==========
 								;	 28
 
-	clc		; fixed_add(&space_y,&temp,&space_y);		; 2
-	lda	SPACEY_F						; 3
-;	adc	TEMP_F							;
-	adc	RESULT+1						; 3
+	; fixed_add(&space_y,&temp,&space_y);
+	clc								; 2
+			; TEMP_F in A
+	adc	SPACEY_F						; 3
 	sta	SPACEY_F						; 3
-	lda	SPACEY_I						; 3
-;	adc	TEMP_I							;
-	adc	RESULT+2						; 3
+
+	txa		; TEMP_I in X					; 2
+	adc	SPACEY_I						; 3
 	sta	SPACEY_I						; 3
 
-	; brk	; space_y = f7:04
+								;==========
+								;	 16
+
 
 	ldx	#40	; was SCREEN_X					; 2
 								;==========
-								;	 22
+								;	  2
 screenx_loop: