M devices/terminal.c → devices/terminal.c

@@ -4,6 +4,7 @@ 
 /* terminal device */
 #define TERMINAL_INPUT 0x0
 #define TERMINAL_OUTPUT 0x1
+#define TERMINAL_ON_KEYPRESS 0x2
 
 void terminal_output(xyw_byte *data, xyw_byte addr, xyw_byte *error)
 {
@@ -16,3 +17,20 @@ fflush(stdout);
         break;
     }
 }
+
+void terminal_input(xyw_byte *data, xyw_byte addr, xyw_byte *error)
+{
+    (void)error;
+    switch (addr)
+    {
+    case TERMINAL_INPUT:
+        data[addr] = (xyw_byte)getchar();
+        // If on keypress word is set, trigger jump to address at that location
+        if (data[TERMINAL_ON_KEYPRESS] != 0)
+        {
+            xyw_word jump_addr = XYW_PEEKW(&data[TERMINAL_ON_KEYPRESS]);
+            // Todo: execute code at address
+        }
+        break;
+    }
+}

M xyw.h → xyw.h

@@ -15,7 +15,6 @@ 
 typedef unsigned char xyw_byte;
 typedef unsigned short xyw_word;
 
-// Device contract
 typedef xyw_byte (*xyw_input)(xyw_byte *data, xyw_byte addr, xyw_byte *error);
 typedef void (*xyw_output)(xyw_byte *data, xyw_byte addr, xyw_byte *error);
 typedef void (*xyw_init)(xyw_byte *data);