diff --git a/teensy/RA8875_t4.cpp b/teensy/RA8875_t4.cpp
index 5cdb6c7..3288242 100644
--- a/teensy/RA8875_t4.cpp
+++ b/teensy/RA8875_t4.cpp
@@ -79,6 +79,10 @@
 
 #define TCR_MASK  (LPSPI_TCR_PCS(3) | LPSPI_TCR_FRAMESZ(31) | LPSPI_TCR_CONT | LPSPI_TCR_RXMSK )
 
+#define _565toR(c) ( ((c) & 0xF800) >> 8 )
+#define _565toG(c) ( ((c) & 0x07E0) >> 3 )
+#define _565toB(c) ( ((c) & 0x001F) << 3 )
+
 static  RA8875_t4 *_dmaActiveDisplay[3];
 
 RA8875_t4::RA8875_t4(const uint8_t cs_pin, const uint8_t rst_pin, const uint8_t mosi_pin, const uint8_t sck_pin, const uint8_t miso_pin)
@@ -95,7 +99,6 @@ RA8875_t4::RA8875_t4(const uint8_t cs_pin, const uint8_t rst_pin, const uint8_t
   _pspi = NULL;
   _pfbtft = NULL;
   _dma_state = 0;
-  pending_rx_count = 0;
   _frame_complete_callback = NULL;
   _frame_callback_on_HalfDone = false;
   _dma_frame_count = 0;
@@ -146,7 +149,6 @@ void RA8875_t4::begin(uint32_t spi_clock, uint32_t spi_clock_read)
   //  DIRECT_WRITE_HIGH(_csport, _cspinmask);
   digitalWriteFast(_cs, HIGH);
 
-  pending_rx_count = 0; // Make sure it is zero if we we do a second begin...
   _spi_tcr_current = _pimxrt_spi->TCR; // get the current TCR value
   
   maybeUpdateTCR(LPSPI_TCR_PCS(3)|LPSPI_TCR_FRAMESZ(7));
@@ -348,11 +350,10 @@ bool RA8875_t4::updateScreenAsync(bool update_cont)
   while (pftbft < pfbtft_end) {
     _pspi->transfer(*pftbft++);
   }
-  pending_rx_count++; // waiting for one more full transaction to complete
-  waitTransmitComplete();
   _endSend();
 
-  return;
+  return true;
+  // DEBUG END
   
   if (!_pfbtft) return false;
 
@@ -427,9 +428,9 @@ void RA8875_t4::fillWindow(uint16_t color)
   _writeRegister(RA8875_DLVER0 + 1,y1 >> 8);
   
   // Set the color
-  _writeRegister(RA8875_FGCR0,((color & 0xF800) >> 11)); // 5 bits red
-  _writeRegister(RA8875_FGCR0+1,((color & 0x07E0) >> 5)); // 6 bits green
-  _writeRegister(RA8875_FGCR0+2,((color & 0x001F)     )); // 5 bits blue
+  _writeRegister(RA8875_FGCR0,_565toR(color) >> 2); // 5 bits red -> 3 bits red
+  _writeRegister(RA8875_FGCR0+1,_565toG(color) >> 3); // 6 bits green -> 3 bits green
+  _writeRegister(RA8875_FGCR0+2,_565toB(color) >> 3); // 5 bits blue -> 2 bits blue
 
   // Send fill
   writeCommand(RA8875_DCR); // draw control register
@@ -619,18 +620,6 @@ void RA8875_t4::process_dma_interrupt(void) {
   }
 }
 
-void RA8875_t4::waitTransmitComplete(void)  {
-  uint32_t tmp __attribute__((unused));
-
-  while (pending_rx_count) {
-    if ((_pimxrt_spi->RSR & LPSPI_RSR_RXEMPTY) == 0)  {
-      tmp = _pimxrt_spi->RDR;  // Read any pending RX bytes in            
-      pending_rx_count--; //decrement count of bytes still levt           
-    }
-  }
-  _pimxrt_spi->CR = LPSPI_CR_MEN | LPSPI_CR_RRF; // Clear receive FIFO and leave module enabled
-}
-
 // Other possible methods, that I don't think we'll need:
 // void RA8875_t4::setFrameCompleteCB(void (*pcb)(), bool fCallAlsoHalfDone)
 
diff --git a/teensy/RA8875_t4.h b/teensy/RA8875_t4.h
index 81867f1..33f86bf 100644
--- a/teensy/RA8875_t4.h
+++ b/teensy/RA8875_t4.h
@@ -49,7 +49,6 @@ private:
   // These are the old style RA8875 calls -- replace them ***
   void writeCommand(const uint8_t d);
   void writeData16(uint16_t data);
-  void waitTransmitComplete(void);
   
   void _writeData(uint8_t data);
   void _writeRegister(const uint8_t reg, uint8_t val);
@@ -91,7 +90,6 @@ private:
   uint32_t _spi_fcr_save;
   uint8_t *_pfbtft;
   volatile uint8_t _dma_state;
-  uint8_t pending_rx_count;
   uint32_t _spi_tcr_current;
   volatile uint32_t _dma_frame_count;
   volatile uint16_t _dma_sub_frame_count;
diff --git a/teensy/teensy-display.cpp b/teensy/teensy-display.cpp
index 27ae33f..7272fd9 100644
--- a/teensy/teensy-display.cpp
+++ b/teensy/teensy-display.cpp
@@ -80,7 +80,7 @@ TeensyDisplay::~TeensyDisplay()
 
 void TeensyDisplay::flush()
 {
-  // Nothing to flush, b/c there's no DMA in this driver and we draw it all in real-time. (Eww.)
+  tft.updateScreenAsync(false);
 }
 
 void TeensyDisplay::redraw()
@@ -114,7 +114,10 @@ void TeensyDisplay::blit()
   // Start updates, if they're not running already
   //  if (!tft.asyncUpdateActive())
   //    tft.updateScreenAsync(true);
-  tft.updateScreenAsync(false);
+  // DEBUGGING: not refreshing every time so I can see the machine boot
+  static uint32_t ctr = 0;
+  if (((ctr++) & 0x0F) == 0)
+    tft.updateScreenAsync(false);
   
   // draw overlay, if any, occasionally
   {
@@ -209,12 +212,12 @@ void TeensyDisplay::clrScr(uint8_t coloridx)
   if (coloridx == c_black) {
     tft.fillWindow();
   } else if (coloridx == c_white) {
-    tft.fillWindow();
+    tft.fillWindow(loresPixelColors[c_white]);
   } else {
     uint16_t color16 = loresPixelColors[c_black];
     if (coloridx < 16)
       color16 = loresPixelColors[coloridx];
-    tft.fillWindow();
+    tft.fillWindow(color16);
   }
 }