diff --git a/hw/blank.h b/hw/blank.h
index 0e58af1..8fd85e6 100644
--- a/hw/blank.h
+++ b/hw/blank.h
@@ -10,6 +10,7 @@
 
 // SPI-RAM
 #undef USE_SPIRAM
+#define SPIRAM_SIZE	0u
 
 // "tape" storage...
 #undef USE_SD
diff --git a/hw/esp32-espi-dac.h b/hw/esp32-espi-dac.h
index c55a7d2..67c050e 100644
--- a/hw/esp32-espi-dac.h
+++ b/hw/esp32-espi-dac.h
@@ -19,6 +19,7 @@
 
 // SPI-RAM
 #undef USE_SPIRAM
+#define SPIRAM_SIZE	0u
 
 // "tape" storage...
 #undef USE_SD
diff --git a/hw/esp32-utft-dac.h b/hw/esp32-utft-dac.h
index 6b101fe..0e6b89f 100644
--- a/hw/esp32-utft-dac.h
+++ b/hw/esp32-utft-dac.h
@@ -15,6 +15,7 @@
 
 // SPI-RAM
 #undef USE_SPIRAM
+#define SPIRAM_SIZE	0u
 
 // "tape" storage...
 #undef USE_SD
diff --git a/hw/esp8266-pwm-fs.h b/hw/esp8266-pwm-fs.h
index aafeef0..75267ed 100644
--- a/hw/esp8266-pwm-fs.h
+++ b/hw/esp8266-pwm-fs.h
@@ -19,6 +19,7 @@
 
 // SPI-RAM
 #undef USE_SPIRAM
+#define SPIRAM_SIZE	0u
 
 // "tape" storage...
 #undef USE_SD
diff --git a/hw/esp8266-pwm-sd.h b/hw/esp8266-pwm-sd.h
index 838ea84..fe4f20e 100644
--- a/hw/esp8266-pwm-sd.h
+++ b/hw/esp8266-pwm-sd.h
@@ -19,6 +19,7 @@
 
 // SPI-RAM
 #undef USE_SPIRAM
+#define SPIRAM_SIZE	0u
 
 // "tape" storage...
 #define USE_SD
diff --git a/hw/esp8266-pwm.h b/hw/esp8266-pwm.h
index 55fee6a..b49962b 100644
--- a/hw/esp8266-pwm.h
+++ b/hw/esp8266-pwm.h
@@ -19,6 +19,7 @@
 
 // SPI-RAM
 #undef USE_SPIRAM
+#define SPIRAM_SIZE	0u
 
 // "tape" storage...
 #undef USE_SD
diff --git a/hw/lm4f-utft-sd.h b/hw/lm4f-utft-sd.h
index 5f0a204..1454125 100644
--- a/hw/lm4f-utft-sd.h
+++ b/hw/lm4f-utft-sd.h
@@ -21,7 +21,7 @@
 #define SPIRAM_DEV      SPI_for_SD
 #define SPIRAM_MODULE	1
 #define SPIRAM_CLKDIV	1
-#define SPIRAM_SIZE	65536
+#define SPIRAM_SIZE	65536u
 
 // "tape" storage...
 #define USE_SD
diff --git a/hw/lm4f-utft.h b/hw/lm4f-utft.h
index 03dded9..e9bcd3e 100644
--- a/hw/lm4f-utft.h
+++ b/hw/lm4f-utft.h
@@ -17,6 +17,7 @@
 
 // SPI-RAM
 #undef USE_SPIRAM
+#define SPIRAM_SIZE	0u
 
 // "tape" storage...
 #undef USE_SD