diff --git a/include/mgba/internal/gba/renderers/video-software.h b/include/mgba/internal/gba/renderers/video-software.h
index 623d6857f..4bc644b5e 100644
--- a/include/mgba/internal/gba/renderers/video-software.h
+++ b/include/mgba/internal/gba/renderers/video-software.h
@@ -103,7 +103,7 @@ struct WindowControl {
 #define MAX_WINDOW 5
 
 struct Window {
-	uint8_t endX;
+	uint16_t endX;
 	struct WindowControl control;
 };
 
@@ -117,8 +117,8 @@ struct GBAVideoSoftwareRenderer {
 
 	GBARegisterDISPCNT dispcnt;
 
-	uint32_t row[VIDEO_HORIZONTAL_PIXELS];
-	uint32_t spriteLayer[VIDEO_HORIZONTAL_PIXELS];
+	uint32_t row[256];
+	uint32_t spriteLayer[256];
 	int32_t spriteCyclesRemaining;
 
 	// BLDCNT
@@ -159,6 +159,7 @@ struct GBAVideoSoftwareRenderer {
 
 	int start;
 	int end;
+	int masterEnd;
 };
 
 void GBAVideoSoftwareRendererCreate(struct GBAVideoSoftwareRenderer* renderer);
diff --git a/src/ds/renderers/software.c b/src/ds/renderers/software.c
index 8ffb45315..bc5b8a842 100644
--- a/src/ds/renderers/software.c
+++ b/src/ds/renderers/software.c
@@ -41,10 +41,10 @@ static void DSVideoSoftwareRendererInit(struct DSVideoRenderer* renderer) {
 	struct DSVideoSoftwareRenderer* softwareRenderer = (struct DSVideoSoftwareRenderer*) renderer;
 	softwareRenderer->engA.d.palette = &renderer->palette[0];
 	softwareRenderer->engA.d.oam = &renderer->oam->oam[0];
-	// TODO: VRAM
+	softwareRenderer->engA.masterEnd = DS_VIDEO_HORIZONTAL_PIXELS;
 	softwareRenderer->engB.d.palette = &renderer->palette[512];
 	softwareRenderer->engB.d.oam = &renderer->oam->oam[1];
-	// TODO: VRAM
+	softwareRenderer->engB.masterEnd = DS_VIDEO_HORIZONTAL_PIXELS;
 
 	DSVideoSoftwareRendererReset(renderer);
 }
@@ -96,7 +96,6 @@ static uint16_t DSVideoSoftwareRendererWriteVideoRegister(struct DSVideoRenderer
 	case DS9_REG_A_DISPCNT_LO:
 		softwareRenderer->dispcntA &= 0xFFFF0000;
 		softwareRenderer->dispcntA |= value;
-		softwareRenderer->engA.d.writeVideoRegister(&softwareRenderer->engA.d, address, value & 0xFF87);
 		GBAVideoSoftwareRendererUpdateDISPCNTA(softwareRenderer);
 		break;
 	case DS9_REG_A_DISPCNT_HI:
diff --git a/src/gba/renderers/software-bg.c b/src/gba/renderers/software-bg.c
index 5cbc9e49a..21ce149d1 100644
--- a/src/gba/renderers/software-bg.c
+++ b/src/gba/renderers/software-bg.c
@@ -99,10 +99,10 @@ void GBAVideoSoftwareRendererDrawBackgroundMode3(struct GBAVideoSoftwareRenderer
 	int outX;
 	uint32_t* pixel;
 	for (outX = renderer->start, pixel = &renderer->row[outX]; outX < renderer->end; ++outX, ++pixel) {
-		BACKGROUND_BITMAP_ITERATE(VIDEO_HORIZONTAL_PIXELS, VIDEO_VERTICAL_PIXELS);
+		BACKGROUND_BITMAP_ITERATE(renderer->masterEnd, VIDEO_VERTICAL_PIXELS);
 
 		if (!mosaicWait) {
-			LOAD_16(color, ((localX >> 8) + (localY >> 8) * VIDEO_HORIZONTAL_PIXELS) << 1, renderer->d.vramBG[0]);
+			LOAD_16(color, ((localX >> 8) + (localY >> 8) * renderer->masterEnd) << 1, renderer->d.vramBG[0]);
 #ifndef COLOR_16_BIT
 			unsigned color32;
 			color32 = 0;
@@ -152,10 +152,10 @@ void GBAVideoSoftwareRendererDrawBackgroundMode4(struct GBAVideoSoftwareRenderer
 	int outX;
 	uint32_t* pixel;
 	for (outX = renderer->start, pixel = &renderer->row[outX]; outX < renderer->end; ++outX, ++pixel) {
-		BACKGROUND_BITMAP_ITERATE(VIDEO_HORIZONTAL_PIXELS, VIDEO_VERTICAL_PIXELS);
+		BACKGROUND_BITMAP_ITERATE(renderer->masterEnd, VIDEO_VERTICAL_PIXELS);
 
 		if (!mosaicWait) {
-			color = ((uint8_t*)renderer->d.vramBG[0])[offset + (localX >> 8) + (localY >> 8) * VIDEO_HORIZONTAL_PIXELS];
+			color = ((uint8_t*)renderer->d.vramBG[0])[offset + (localX >> 8) + (localY >> 8) * renderer->masterEnd];
 
 			mosaicWait = mosaicH;
 		} else {
diff --git a/src/gba/renderers/software-mode0.c b/src/gba/renderers/software-mode0.c
index c8f6a4f36..b61d55cf3 100644
--- a/src/gba/renderers/software-mode0.c
+++ b/src/gba/renderers/software-mode0.c
@@ -366,7 +366,7 @@
 	if (background->mosaic && GBAMosaicControlGetBgH(renderer->mosaic)) { \
 		int mosaicH = GBAMosaicControlGetBgH(renderer->mosaic) + 1; \
 		int x; \
-		int mosaicWait = (mosaicH - outX + VIDEO_HORIZONTAL_PIXELS * mosaicH) % mosaicH; \
+		int mosaicWait = (mosaicH - outX + renderer->masterEnd * mosaicH) % mosaicH; \
 		int carryData = 0; \
 		paletteData = 0; /* Quiets compiler warning */ \
 		DRAW_BACKGROUND_MODE_0_MOSAIC_ ## BPP (BLEND, OBJWIN) \
@@ -401,7 +401,7 @@
 	/*! TODO: Make sure these lines can be removed */ \
 	/*!*/ pixel = &renderer->row[outX]; \
 	outX += (tileEnd - tileX) * 8; \
-	/*!*/ if (VIDEO_CHECKS &&  UNLIKELY(outX > VIDEO_HORIZONTAL_PIXELS)) { \
+	/*!*/ if (VIDEO_CHECKS &&  UNLIKELY(outX > renderer->masterEnd)) { \
 	/*!*/	mLOG(GBA_VIDEO, FATAL, "Out of bounds background draw would occur!"); \
 	/*!*/	return; \
 	/*!*/ } \
@@ -419,7 +419,7 @@
 	if (VIDEO_CHECKS && UNLIKELY(&renderer->row[outX] != pixel)) { \
 		mLOG(GBA_VIDEO, FATAL, "Background draw ended in the wrong place! Diff: %" PRIXPTR, &renderer->row[outX] - pixel); \
 	} \
-	if (VIDEO_CHECKS && UNLIKELY(outX > VIDEO_HORIZONTAL_PIXELS)) { \
+	if (VIDEO_CHECKS && UNLIKELY(outX > renderer->masterEnd)) { \
 		mLOG(GBA_VIDEO, FATAL, "Out of bounds background draw occurred!"); \
 		return; \
 	}
diff --git a/src/gba/renderers/software-obj.c b/src/gba/renderers/software-obj.c
index a9d6d368e..79afadde1 100644
--- a/src/gba/renderers/software-obj.c
+++ b/src/gba/renderers/software-obj.c
@@ -279,8 +279,8 @@ int GBAVideoSoftwareRendererPreprocessSprite(struct GBAVideoSoftwareRenderer* re
 				SPRITE_TRANSFORMED_LOOP(256, NORMAL);
 			}
 		}
-		if (x + totalWidth > VIDEO_HORIZONTAL_PIXELS) {
-			renderer->spriteCyclesRemaining -= (x + totalWidth - VIDEO_HORIZONTAL_PIXELS) * 2;
+		if (x + totalWidth > renderer->masterEnd) {
+			renderer->spriteCyclesRemaining -= (x + totalWidth - renderer->masterEnd) * 2;
 		}
 	} else {
 		int outX = x >= start ? x : start;
@@ -340,8 +340,8 @@ int GBAVideoSoftwareRendererPreprocessSprite(struct GBAVideoSoftwareRenderer* re
 				SPRITE_NORMAL_LOOP(256, NORMAL);
 			}
 		}
-		if (x + width > VIDEO_HORIZONTAL_PIXELS) {
-			renderer->spriteCyclesRemaining -= x + width - VIDEO_HORIZONTAL_PIXELS;
+		if (x + width > renderer->masterEnd) {
+			renderer->spriteCyclesRemaining -= x + width - renderer->masterEnd;
 		}
 	}
 	return 1;
diff --git a/src/gba/renderers/video-software.c b/src/gba/renderers/video-software.c
index 231552826..9cd9423d2 100644
--- a/src/gba/renderers/video-software.c
+++ b/src/gba/renderers/video-software.c
@@ -63,6 +63,7 @@ void GBAVideoSoftwareRendererCreate(struct GBAVideoSoftwareRenderer* renderer) {
 	renderer->d.disableBG[3] = false;
 	renderer->d.disableOBJ = false;
 	renderer->tileStride = 0x20;
+	renderer->masterEnd = VIDEO_HORIZONTAL_PIXELS;
 
 	renderer->temporaryBuffer = 0;
 }
@@ -73,10 +74,10 @@ static void GBAVideoSoftwareRendererInit(struct GBAVideoRenderer* renderer) {
 	struct GBAVideoSoftwareRenderer* softwareRenderer = (struct GBAVideoSoftwareRenderer*) renderer;
 
 	int y;
-	for (y = 0; y < VIDEO_VERTICAL_PIXELS; ++y) {
+	for (y = 0; y < softwareRenderer->masterEnd; ++y) {
 		color_t* row = &softwareRenderer->outputBuffer[softwareRenderer->outputBufferStride * y];
 		int x;
-		for (x = 0; x < VIDEO_HORIZONTAL_PIXELS; ++x) {
+		for (x = 0; x < softwareRenderer->masterEnd; ++x) {
 			row[x] = GBA_COLOR_WHITE;
 		}
 	}
@@ -271,26 +272,26 @@ static uint16_t GBAVideoSoftwareRendererWriteVideoRegister(struct GBAVideoRender
 	case REG_WIN0H:
 		softwareRenderer->winN[0].h.end = value;
 		softwareRenderer->winN[0].h.start = value >> 8;
-		if (softwareRenderer->winN[0].h.start > VIDEO_HORIZONTAL_PIXELS && softwareRenderer->winN[0].h.start > softwareRenderer->winN[0].h.end) {
+		if (softwareRenderer->winN[0].h.start > softwareRenderer->masterEnd && softwareRenderer->winN[0].h.start > softwareRenderer->winN[0].h.end) {
 			softwareRenderer->winN[0].h.start = 0;
 		}
-		if (softwareRenderer->winN[0].h.end > VIDEO_HORIZONTAL_PIXELS) {
-			softwareRenderer->winN[0].h.end = VIDEO_HORIZONTAL_PIXELS;
-			if (softwareRenderer->winN[0].h.start > VIDEO_HORIZONTAL_PIXELS) {
-				softwareRenderer->winN[0].h.start = VIDEO_HORIZONTAL_PIXELS;
+		if (softwareRenderer->winN[0].h.end > softwareRenderer->masterEnd) {
+			softwareRenderer->winN[0].h.end = softwareRenderer->masterEnd;
+			if (softwareRenderer->winN[0].h.start > softwareRenderer->masterEnd) {
+				softwareRenderer->winN[0].h.start = softwareRenderer->masterEnd;
 			}
 		}
 		break;
 	case REG_WIN1H:
 		softwareRenderer->winN[1].h.end = value;
 		softwareRenderer->winN[1].h.start = value >> 8;
-		if (softwareRenderer->winN[1].h.start > VIDEO_HORIZONTAL_PIXELS && softwareRenderer->winN[1].h.start > softwareRenderer->winN[1].h.end) {
+		if (softwareRenderer->winN[1].h.start > softwareRenderer->masterEnd && softwareRenderer->winN[1].h.start > softwareRenderer->winN[1].h.end) {
 			softwareRenderer->winN[1].h.start = 0;
 		}
-		if (softwareRenderer->winN[1].h.end > VIDEO_HORIZONTAL_PIXELS) {
-			softwareRenderer->winN[1].h.end = VIDEO_HORIZONTAL_PIXELS;
-			if (softwareRenderer->winN[1].h.start > VIDEO_HORIZONTAL_PIXELS) {
-				softwareRenderer->winN[1].h.start = VIDEO_HORIZONTAL_PIXELS;
+		if (softwareRenderer->winN[1].h.end > softwareRenderer->masterEnd) {
+			softwareRenderer->winN[1].h.end = softwareRenderer->masterEnd;
+			if (softwareRenderer->winN[1].h.start > softwareRenderer->masterEnd) {
+				softwareRenderer->winN[1].h.start = softwareRenderer->masterEnd;
 			}
 		}
 		break;
@@ -394,10 +395,10 @@ static void _breakWindow(struct GBAVideoSoftwareRenderer* softwareRenderer, stru
 	} else if (y >= win->v.end && y < win->v.start) {
 		return;
 	}
-	if (win->h.end > VIDEO_HORIZONTAL_PIXELS || win->h.end < win->h.start) {
+	if (win->h.end > softwareRenderer->masterEnd || win->h.end < win->h.start) {
 		struct WindowN splits[2] = { *win, *win };
 		splits[0].h.start = 0;
-		splits[1].h.end = VIDEO_HORIZONTAL_PIXELS;
+		splits[1].h.end = softwareRenderer->masterEnd;
 		_breakWindowInner(softwareRenderer, &splits[0]);
 		_breakWindowInner(softwareRenderer, &splits[1]);
 	} else {
@@ -487,21 +488,21 @@ static void GBAVideoSoftwareRendererDrawScanline(struct GBAVideoRenderer* render
 	color_t* row = &softwareRenderer->outputBuffer[softwareRenderer->outputBufferStride * y];
 	if (GBARegisterDISPCNTIsForcedBlank(softwareRenderer->dispcnt)) {
 		int x;
-		for (x = 0; x < VIDEO_HORIZONTAL_PIXELS; ++x) {
+		for (x = 0; x < softwareRenderer->masterEnd; ++x) {
 			row[x] = GBA_COLOR_WHITE;
 		}
 		return;
 	}
 
 	int x;
-	for (x = 0; x < VIDEO_HORIZONTAL_PIXELS; x += 4) {
+	for (x = 0; x < softwareRenderer->masterEnd; x += 4) {
 		softwareRenderer->spriteLayer[x] = FLAG_UNWRITTEN;
 		softwareRenderer->spriteLayer[x + 1] = FLAG_UNWRITTEN;
 		softwareRenderer->spriteLayer[x + 2] = FLAG_UNWRITTEN;
 		softwareRenderer->spriteLayer[x + 3] = FLAG_UNWRITTEN;
 	}
 
-	softwareRenderer->windows[0].endX = VIDEO_HORIZONTAL_PIXELS;
+	softwareRenderer->windows[0].endX = softwareRenderer->masterEnd;
 	softwareRenderer->nWindows = 1;
 	if (GBARegisterDISPCNTIsWin0Enable(softwareRenderer->dispcnt) || GBARegisterDISPCNTIsWin1Enable(softwareRenderer->dispcnt) || GBARegisterDISPCNTIsObjwinEnable(softwareRenderer->dispcnt)) {
 		softwareRenderer->windows[0].control = softwareRenderer->winout;
@@ -586,14 +587,14 @@ static void GBAVideoSoftwareRendererDrawScanline(struct GBAVideoRenderer* render
 
 #ifdef COLOR_16_BIT
 #if defined(__ARM_NEON) && !defined(__APPLE__)
-	_to16Bit(row, softwareRenderer->row, VIDEO_HORIZONTAL_PIXELS);
+	_to16Bit(row, softwareRenderer->row, softwareRenderer->masterEnd);
 #else
-	for (x = 0; x < VIDEO_HORIZONTAL_PIXELS; ++x) {
+	for (x = 0; x < softwareRenderer->masterEnd; ++x) {
 		row[x] = softwareRenderer->row[x];
 	}
 #endif
 #else
-	memcpy(row, softwareRenderer->row, VIDEO_HORIZONTAL_PIXELS * sizeof(*row));
+	memcpy(row, softwareRenderer->row, softwareRenderer->masterEnd * sizeof(*row));
 #endif
 }
 
@@ -601,7 +602,7 @@ static void GBAVideoSoftwareRendererFinishFrame(struct GBAVideoRenderer* rendere
 	struct GBAVideoSoftwareRenderer* softwareRenderer = (struct GBAVideoSoftwareRenderer*) renderer;
 
 	if (softwareRenderer->temporaryBuffer) {
-		mappedMemoryFree(softwareRenderer->temporaryBuffer, VIDEO_HORIZONTAL_PIXELS * VIDEO_VERTICAL_PIXELS * 4);
+		mappedMemoryFree(softwareRenderer->temporaryBuffer, softwareRenderer->masterEnd * VIDEO_VERTICAL_PIXELS * 4);
 		softwareRenderer->temporaryBuffer = 0;
 	}
 	softwareRenderer->bg[2].sx = softwareRenderer->bg[2].refx;
@@ -622,7 +623,7 @@ static void GBAVideoSoftwareRendererPutPixels(struct GBAVideoRenderer* renderer,
 	const color_t* colorPixels = pixels;
 	unsigned i;
 	for (i = 0; i < VIDEO_VERTICAL_PIXELS; ++i) {
-		memmove(&softwareRenderer->outputBuffer[softwareRenderer->outputBufferStride * i], &colorPixels[stride * i], VIDEO_HORIZONTAL_PIXELS * BYTES_PER_PIXEL);
+		memmove(&softwareRenderer->outputBuffer[softwareRenderer->outputBufferStride * i], &colorPixels[stride * i], softwareRenderer->masterEnd * BYTES_PER_PIXEL);
 	}
 }