diff --git a/src/main.c b/src/main.c
index 9c87a7b..2dadbdf 100644
--- a/src/main.c
+++ b/src/main.c
@@ -127,14 +127,14 @@
 //#define PICO_CLOCK_PLL 984000000 // 328MHz - 1.15v
 //#define PICO_CLOCK_PLL_DIV1 3
 
-//#define PICO_CLOCK_PLL 1056000000 // 352MHz - 1.3v
-//#define PICO_CLOCK_PLL_DIV1 3
+#define PICO_CLOCK_PLL 1056000000 // 352MHz - 1.3v
+#define PICO_CLOCK_PLL_DIV1 3
 
 //#define PICO_CLOCK_PLL 1128000000 // 376MHz - 1.3v
 //#define PICO_CLOCK_PLL_DIV1 3
 
-#define PICO_CLOCK_PLL 1512000000 // 378MHz - 1.3v
-#define PICO_CLOCK_PLL_DIV1 4
+//#define PICO_CLOCK_PLL 1512000000 // 378MHz - 1.3v
+//#define PICO_CLOCK_PLL_DIV1 4
 
 //#define PICO_CLOCK_PLL 804000000 // 402MHz - DOES NOT WORK
 //#define PICO_CLOCK_PLL_DIV1 2
@@ -364,15 +364,8 @@ inline uint32_t bigRgb2LittleBgr(uint32_t val)
   return val | ((val >> 12) << 4);
 }
 
-static void tmsPorch(uint16_t* pixels)
+static void tmsPorch()
 {
-  uint32_t* dPixels = (uint32_t*)pixels;
-  //bg = bigRgb2LittleBgr(tms9918->pram[vrEmuTms9918RegValue(TMS_REG_FG_BG_COLOR) & 0x0f]);
-  bg = 0;//bg | (bg << 16);
-  dma_channel_wait_for_finish_blocking(dma32);
-  dma_channel_set_write_addr(dma32, dPixels, false);
-  dma_channel_set_trans_count(dma32, VIRTUAL_PIXELS_X / 2, true);
-
   tms9918->blanking = 1; // V
   tms9918->scanline = 255; // F18A value for vsync
   tms9918->status [0x03] = 255;
diff --git a/src/vga/vga.c b/src/vga/vga.c
index c4963e8..ffbf315 100644
--- a/src/vga/vga.c
+++ b/src/vga/vga.c
@@ -329,6 +329,7 @@ static void __isr __time_critical_func(dmaIrqHandler)(void)
       if (currentTimingLine + 2 == (vgaParams.params.vSyncParams.syncPixels + vgaParams.params.vSyncParams.backPorchPixels))
       {
         multicore_fifo_push_timeout_us(0, 0);
+        multicore_fifo_push_timeout_us(1, 0);
       }
     }
     else if (currentTimingLine < (vgaParams.params.vSyncParams.totalPixels - vgaParams.params.vSyncParams.frontPorchPixels))
@@ -340,7 +341,7 @@ static void __isr __time_critical_func(dmaIrqHandler)(void)
       dma_channel_set_read_addr(syncDmaChan, syncDataPorch, true);
       if (currentTimingLine == (vgaParams.params.vSyncParams.totalPixels - vgaParams.params.vSyncParams.frontPorchPixels) + 2)
       {
-        multicore_fifo_push_timeout_us(FRONT_PORCH_MSG | 1, 0);
+        multicore_fifo_push_timeout_us(FRONT_PORCH_MSG, 0);
       }
     }
 #if VGA_SCANLINE_CB_ENABLE    
@@ -352,6 +353,7 @@ static void __isr __time_critical_func(dmaIrqHandler)(void)
   {
     dma_hw->ints0 = rgbDmaChanMask;
 
+    currentDisplayLine++;
 #if VGA_HARDCODED_640
     uint32_t pxLine = currentDisplayLine >> 1;
     uint32_t pxLineRpt = currentDisplayLine & 0x01;
@@ -362,7 +364,6 @@ static void __isr __time_critical_func(dmaIrqHandler)(void)
 #endif
 
     uint32_t* currentBuffer = (uint32_t*)rgbDataBuffer[pxLine & 0x01];
-    currentDisplayLine++;
 
 #if VGA_CRT_EFFECT
     if (vgaParams.scanlines && pxLineRpt != 0)
@@ -382,22 +383,16 @@ static void __isr __time_critical_func(dmaIrqHandler)(void)
     }
 #endif
 
-    if (currentDisplayLine == VIRTUAL_PIXELS_Y * 2)
-    {
-      currentBuffer [0] = 0;
-      currentBuffer [1] = 0;
-      currentBuffer [2] = 0;
-      currentBuffer [3] = 0;
-      currentBuffer [4] = 0;
-    }
     dma_channel_set_read_addr(rgbDmaChan, currentBuffer, true);
 
     // need a new line every X display lines
-    if ((pxLineRpt == 0))
+    if (pxLineRpt == 0)
     {
       uint32_t requestLine = pxLine + 1;
       if (requestLine < VIRTUAL_PIXELS_Y)
+      {
         multicore_fifo_push_timeout_us(requestLine, 0);
+      }
 
 #if VGA_SCANLINE_TIME_DEBUG
       hasRenderedNext = false;
@@ -449,11 +444,11 @@ void __time_critical_func(vgaLoop)()
   {
     uint32_t message = multicore_fifo_pop_blocking();
 
-    if ((message & ~1) == FRONT_PORCH_MSG)
+    if (message == FRONT_PORCH_MSG)
     {
       if (vgaParams.porchFn)
       {
-        vgaParams.porchFn(rgbDataBuffer[message & 1]);
+        vgaParams.porchFn();
       }
     }
     else if (message == END_OF_FRAME_MSG)
@@ -476,16 +471,19 @@ void __time_critical_func(vgaLoop)()
     else
     {
       bool doEof = false;
-      while (multicore_fifo_rvalid()) // if we dropped a scanline, no point rendering it now
+      if (message != 0)
       {
-        uint32_t nextMessage = sio_hw->fifo_rd;
-        if (nextMessage == END_OF_FRAME_MSG)
-        {
-          doEof = true;
-        }
-        else
+        while (multicore_fifo_rvalid()) // if we dropped a scanline, no point rendering it now
         {
-          message = nextMessage;
+          uint32_t nextMessage = sio_hw->fifo_rd;
+          if (nextMessage == END_OF_FRAME_MSG)
+          {
+            doEof = true;
+          }
+          else
+          {
+            message = nextMessage;
+          }
         }
       }
 
diff --git a/src/vga/vga.h b/src/vga/vga.h
index 1130319..8441361 100644
--- a/src/vga/vga.h
+++ b/src/vga/vga.h
@@ -43,7 +43,7 @@ typedef struct
 
 typedef void (*vgaScanlineRgbFn)(uint16_t y, VgaParams* params, uint16_t* pixels);
 typedef void (*vgaEndOfFrameFn)(uint32_t frameNumber);
-typedef void (*vgaPorchFn)(uint16_t* pixels);
+typedef void (*vgaPorchFn)();
 typedef void (*vgaInitFn)();
 typedef void (*vgaEndOfScanlineFn)();
 
diff --git a/submodules/vrEmuTms9918 b/submodules/vrEmuTms9918
index 874e1d0..91c0737 160000
--- a/submodules/vrEmuTms9918
+++ b/submodules/vrEmuTms9918
@@ -1 +1 @@
-Subproject commit 874e1d0f02946b203d93fb8d0a0246aaa55ba636
+Subproject commit 91c073770ee13abff04bd8463b75f3d88f771107