diff --git a/configs/viewtool-stm32f107/src/stm32_ft80x.c b/configs/viewtool-stm32f107/src/stm32_ft80x.c
index 3d0ee13480..bca7fce58b 100644
--- a/configs/viewtool-stm32f107/src/stm32_ft80x.c
+++ b/configs/viewtool-stm32f107/src/stm32_ft80x.c
@@ -234,7 +234,7 @@ static void ft80x_clear(FAR const struct ft80x_config_s *lower)
 static void ft80x_pwrdown(FAR const struct ft80x_config_s *lower,
                           bool pwrdown)
 {
-  /* Powerdown pin is active low */
+  /* Powerdown pin is active low.  Hence, it is really a power up pin. */
 
   stm32_gpiowrite(GPIO_FT80_PD, !pwrdown);
 }
diff --git a/drivers/lcd/ft80x.c b/drivers/lcd/ft80x.c
index 0a06564d28..911a0e9b21 100644
--- a/drivers/lcd/ft80x.c
+++ b/drivers/lcd/ft80x.c
@@ -79,21 +79,27 @@
  * Pre-processor Definitions
  ****************************************************************************/
 
-#define CHIPID     0x7c
-#define ROMID_MASK 0x0000ffff
+#define CHIPID         0x7c
+#define ROMID_MASK     0x0000ffff
+#define VERSION_MASK   0xffff0000
 #if defined(CONFIG_LCD_FT800)
-#  define DEVNAME  "/dev/ft800"
-#  define ROMID    0x00000800
+#  define DEVNAME      "/dev/ft800"
+#  define ROM_CHIPID   0x00010008  /* Byte [0:1] Chip ID "0800" BCD
+                                    * Byte [2:3] Version "0100" BCD */
 #elif defined(CONFIG_LCD_FT801)
-#  define DEVNAME  "/dev/ft801"
-#  define ROMID    0x00000801
+#  define DEVNAME      "/dev/ft801"
+#  define ROM_CHIPID   0x00010108  /* Byte [0:1] Chip ID "0801" BCD
+                                    * Byte [2:3] Version "0100" BCD */
 #else
 #  error No FT80x device configured
 #endif
 
-#define MIN_FADE_DELAY 10     /* Milliseconds */
-#define MAX_FADE_DELAY 16700  /* Milliseconds */
-#define FADE_STEP_MSEC 10     /* Milliseconds */
+#define ROMID          (ROM_CHIPID & ROMID_MASK)
+#define VERSION        (ROM_CHIPID & VERSION_MASK)
+
+#define MIN_FADE_DELAY 10          /* Milliseconds */
+#define MAX_FADE_DELAY 16700       /* Milliseconds */
+#define FADE_STEP_MSEC 10          /* Milliseconds */
 
 /****************************************************************************
  * Private Function Prototypes
@@ -269,7 +275,7 @@ static void ft80x_notify(FAR struct ft80x_dev_s *priv,
 
   if (info->enable)
     {
-      DEBUGASSERT(info->signo > 0 && GOOD_SIGNAL(info->signo) && info->pid > 0);
+      DEBUGASSERT(info->signo > 0 && GOOD_SIGNO(info->signo) && info->pid > 0);
 
       /* Yes.. Signal the client */
 
diff --git a/drivers/lcd/ft80x_spi.c b/drivers/lcd/ft80x_spi.c
index 47193a4059..d1521ca734 100644
--- a/drivers/lcd/ft80x_spi.c
+++ b/drivers/lcd/ft80x_spi.c
@@ -113,21 +113,23 @@ static void ft80x_deselect(FAR struct ft80x_dev_s *priv)
  * Description:
  *   Send a host command to the FT80x
  *
- *   FFor a SPI write command write transaction, the host writes a zero bit
+ *   For an SPI write command write transaction, the host writes a zero bit
  *   followed by a one bit, followed by the 5-bit command, followed by two
  *   bytes of zero. All data is streamed with a single chip select.
  *
+ *   NOTE:  Commands are defined in ft80x.h with bit 7 = 0 and bit 6 = 1.
+ *
  ****************************************************************************/
 
 void ft80x_host_command(FAR struct ft80x_dev_s *priv, uint8_t cmd)
 {
   struct ft80x_hostwrite_s hostwrite;
 
-  DEBUGASSERT(priv != NULL && (cnd & 0xc0) == 0);
+  DEBUGASSERT(priv != NULL && (cmd == 0x00 || (cmd & 0xc0) == 0x40));
 
   /* Format the host write command */
 
-  hostwrite.cmd  = 0x40 | cmd;
+  hostwrite.cmd  = cmd;
   hostwrite.pad1 = 0;
   hostwrite.pad2 = 0;
 
@@ -162,7 +164,7 @@ void ft80x_read_memory(FAR struct ft80x_dev_s *priv, uint32_t addr,
   struct ft80x_spiread_s spiread;
 
   DEBUGASSERT(priv != NULL && (addr & 0xffc00000) == 0 &&
-              buffer != NULL && bulen > 0);
+              buffer != NULL && buflen > 0);
 
   /* Format the read header */
 
@@ -238,7 +240,7 @@ void ft80x_write_memory(FAR struct ft80x_dev_s *priv, uint32_t addr,
   struct ft80x_spiwrite_s spiwrite;
 
   DEBUGASSERT(priv != NULL && (addr & 0xffc00000) == 0 &&
-              buffer != NULL && bulen > 0);
+              buffer != NULL && buflen > 0);
 
   /* Format the write header */
 
diff --git a/include/nuttx/lcd/ft80x.h b/include/nuttx/lcd/ft80x.h
index fc09ea6093..3ef5c6bb69 100644
--- a/include/nuttx/lcd/ft80x.h
+++ b/include/nuttx/lcd/ft80x.h
@@ -634,15 +634,17 @@
 #define FT80X_INT(n)                   (1 << (n))
 
 /* FT80x Display List Commands **************************************************************/
-/* Host commands.  3 word commands.  The first word begins with 0b01, the next two are zero */
+/* Host commands.  3 byte commands.  The first byte begins with [7:6]==01.  Bits [5:0] of
+ * the first byte are actual command.  The following two bytes must be zero.
+ */
 
 #define FT80X_CMD_ACTIVE           0x00        /* Switch from Standby/Sleep modes to active mode */
 #define FT80X_CMD_STANDBY          0x41        /* Put FT80x core to standby mode */
 #define FT80X_CMD_SLEEP            0x42        /* Put FT80x core to sleep mode */
-#define FT80X_CMD_PWRDOWN          0x50        /* Switch off 1.2V internal regulator */
 #define FT80X_CMD_CLKEXT           0x44        /* Enable PLL input from oscillator or external clock */
-#define FT80X_CMD_CLK48M           0x62        /* Switch PLL output clock to 48MHz (default). */
+#define FT80X_CMD_PWRDOWN          0x50        /* Switch off 1.2V internal regulator */
 #define FT80X_CMD_CLK36M           0x61        /* Switch PLL output clock to 36MHz */
+#define FT80X_CMD_CLK48M           0x62        /* Switch PLL output clock to 48MHz (default). */
 #define FT80X_CMD_CORERST          0x68        /* Send reset pulse to FT800 core */
 
 /* Display list command encoding