Add conio

Also removes print statements from the interrupt handler (except for the
button interrupt)

sw/main.c

@@ -1,24 +1,20 @@
 #include <stdint.h>
+#include <conio.h>
 
 #include "sevenseg.h"
 #include "uart.h"
 
-void puts(const char* s)
-{
-    while (*s) {
-        uart_txb_block(*s);
-        if (*s == '\n')
-            uart_txb_block('\r');
-
-        s++;
-    }
-}
-
 int main() {
-    hex_enable(0x3f);
-    hex_set_24(0xabcdef);
+    char s[16];
+
+    clrscr();
+    cprintf("Hello, world!\n");
+
+    while (1) {
+        cscanf("%15s", s);
+        cprintf("Read string: %s\n", s);
+    }
+
 
-    puts("Hello, World!\n");
-    while(1);
     return 0;
 }