A update

include/io.h

@@ -0,0 +1,16 @@
+/* Defines a abstract base for I/O in the Espresso kernel. */
+
+#ifndef ESPRESSO_IO_H
+#define ESPRESSO_IO_H
+
+#include <stdint.h>
+#include <text_display.h>
+
+void print(const char* str);
+
+char* input(uint8_t dev=0);
+
+void writefile(uint8_t mode, char* file, char* data);
+char* readfile(char* file);
+
+#endif