diff --git a/f256lib/f256.c b/f256lib/f256.c
index 798b73f..bc9d2bf 100644
--- a/f256lib/f256.c
+++ b/f256lib/f256.c
@@ -23,17 +23,40 @@
 
 #include "f256.h"
 
+
+#ifndef WITHOUT_KERNEL
 #include "kernel.c"
+#endif
+#ifndef WITHOUT_DMA
 #include "dma.c"
+#endif
+#ifndef WITHOUT_MATH
 #include "math.c"
+#endif
+#ifndef WITHOUT_RANDOM
 #include "random.c"
+#endif
+#ifndef WITHOUT_TEXT
 #include "text.c"
+#endif
+#ifndef WITHOUT_BITMAP
 #include "bitmap.c"
+#endif
+#ifndef WITHOUT_TILE
 #include "tile.c"
+#endif
+#if  !(defined WITHOUT_BITMAP || defined WITHOUT_TILE || defined WITHOUT_SPRITE)
 #include "graphics.c"
+#endif
+#ifndef WITHOUT_SPRITE
 #include "sprite.c"
+#endif
+#ifndef WITHOUT_FILE
 #include "file.c"
+#endif
+#ifndef WITHOUT_PLATFORM
 #include "platform.c"
+#endif
 
 
 void f256Init(void) {
@@ -54,14 +77,30 @@ void f256Init(void) {
 	//POKE(MMU_MEM_BANK_6, 6);  // Don't use this - it's for the micro kernel.
 	//POKE(MMU_MEM_BANK_7, 7);  // Don't use this - it's for the micro kernel.
 
+#ifndef WITHOUT_KERNEL
 	kernelReset();
+#endif
+#if  !(defined WITHOUT_BITMAP || defined WITHOUT_TILE || defined WITHOUT_SPRITE)
 	graphicsReset();
+#endif
+#ifndef WITHOUT_TEXT
 	textReset();
+#endif
+#ifndef WITHOUT_BITMAP
 	bitmapReset();
+#endif
+#ifndef WITHOUT_TILE
 	tileReset();
+#endif
+#ifndef WITHOUT_SPRITE
 	spriteReset();
+#endif
+#ifndef WITHOUT_FILE
 	fileReset();
+#endif
+#ifndef WITHOUT_RANDOM
 	randomReset();
+#endif
 }
 
 
diff --git a/f256lib/f256.h b/f256lib/f256.h
index ceb4ecf..2d1f4d1 100644
--- a/f256lib/f256.h
+++ b/f256lib/f256.h
@@ -154,7 +154,58 @@ typedef struct colorS {
 #define SET_BIT(x, pos)     (x |= (1U << pos))
 
 
-extern byte SOF;
+// Work out configuration DEFINEs.
+#ifdef WITHOUT_GRAPHICS
+#define WITHOUT_BITMAP
+#define WITHOUT_TILE
+#define WITHOUT_SPRITE
+#endif
+
+#ifndef WITHOUT_FILE   // File requires Kernel
+#undef WITHOUT_KERNEL
+#endif
+
+#ifndef WITHOUT_TEXT   // Text requries Math
+#undef WITHOUT_MATH
+#endif
+
+#ifndef WITHOUT_BITMAP // Bitmap requries Math
+#undef WITHOUT_MATH
+#endif
+
+#ifndef WITHOUT_KERNEL
+#include "kernel.h"
+#endif
+#ifndef WITHOUT_DMA
+#include "dma.h"
+#endif
+#ifndef WITHOUT_MATH
+#include "math.h"
+#endif
+#ifndef WITHOUT_RANDOM
+#include "random.h"
+#endif
+#ifndef WITHOUT_TEXT
+#include "text.h"
+#endif
+#ifndef WITHOUT_BITMAP
+#include "bitmap.h"
+#endif
+#ifndef WITHOUT_TILE
+#include "tile.h"
+#endif
+#if  !(defined WITHOUT_BITMAP || defined WITHOUT_TILE || defined WITHOUT_SPRITE)
+#include "graphics.h"
+#endif
+#ifndef WITHOUT_SPRITE
+#include "sprite.h"
+#endif
+#ifndef WITHOUT_FILE
+#include "file.h"
+#endif
+#ifndef WITHOUT_PLATFORM
+#include "platform.h"
+#endif
 
 
 void     f256Init(void);
@@ -164,19 +215,6 @@ void     FAR_POKE(uint32_t address, byte value);
 void     FAR_POKEW(uint32_t address, uint16_t value);
 
 
-#include "kernel.h"
-#include "dma.h"
-#include "math.h"
-#include "random.h"
-#include "text.h"
-#include "bitmap.h"
-#include "tile.h"
-#include "graphics.h"
-#include "sprite.h"
-#include "file.h"
-#include "platform.h"
-
-
 #ifdef __cplusplus
 }
 #endif
diff --git a/f256lib/file.c b/f256lib/file.c
index 40727f4..4bbc9c9 100644
--- a/f256lib/file.c
+++ b/f256lib/file.c
@@ -178,17 +178,18 @@ char *fileOpenDir(char *name) {
 
 int16_t fileRead(void *buf, uint16_t nbytes, uint16_t nmemb, uint8_t *fd) {
 	char    *data     = (char *)buf;
-	int16_t  gathered = 0;
+	int16_t  read     = 0;
+	uint16_t bytes    = nbytes * nmemb;
 	int16_t  returned;
-	uint16_t bytes = nbytes * nmemb;
 
-	while (gathered < bytes) {
-		returned = kernelRead(*fd, data + gathered, bytes - gathered);
-		if (returned <= 0) return -1;
-		gathered += returned;
+	while (read < bytes) {
+		returned = kernelRead(*fd, data + read, bytes - read);
+		if (returned < 0) return -1;
+		if (returned == 0) break;
+		read += returned;
 	}
 
-	return nmemb;
+	return read / nbytes;
 }
 
 
@@ -384,7 +385,7 @@ int16_t fileWrite(void *buf, uint16_t nbytes, uint16_t nmemb, uint8_t *fd) {
 		bytes -= written;
 	}
 
-	return nmemb;
+	return total / nbytes;
 }