diff --git a/pc-dos/convert.c b/pc-dos/convert.c
new file mode 100644
index 00000000..c995ea31
--- /dev/null
+++ b/pc-dos/convert.c
@@ -0,0 +1,30 @@
+#include <stdio.h>
+
+#define PIXELS 320*200
+
+int main(void) {
+    FILE *fin;
+    FILE *fout;
+    int i;
+
+    fin = fopen("1.bmp", "r");
+    fseek(fin, 1162, SEEK_SET);
+
+    fout = fopen("image.bin", "w");
+
+    for (i=0; i<PIXELS/4; i++) {
+        unsigned char pixels[4];
+        unsigned int out;
+        fread(pixels, 4, 1, fin);
+
+        out = pixels[3] & 0x03 |
+              ((pixels[2] & 0x03) << 2) |
+              ((pixels[1] & 0x03) << 4) |
+              ((pixels[0] & 0x03) << 6);
+        printf("%x ", out);
+        fputc(out, fout);
+    }
+
+    fclose(fin);
+    fclose(fout);
+}