Fixes to actually run code

This is the version to run the first (trivial) infinite loop
correctly.  I hacked up the loader slightly to replace one of the
(nonexistent) pages with a static byte array.

z80 code executed:

$4000:
	JP	$4000

4000  c3 40 00
4003

This version also draws the opcode executed on the screen, to aid in
debugging the emulator:

        move.b  d0,$4c00+32*(128/8)

Also, it turns out that I was mixing up the emulated SP (a4) and emulated
PC (a6).  That has been fixed.

Further, it seems that movea defaults to a word operation in a68k.
This led to pointer corruption, which has been fixed.

1 files changed, 17 insertions, 0 deletions

diff --git a/misc.c b/misc.c
new file mode 100644
index 0000000..9224145
--- /dev/null
+++ b/misc.c
@@ -0,0 +1,17 @@
+/* Miscellaneous C routines for 680 project.
+ *
+ * Error handling, for now.
+ *
+ * Copyright 2010, Duncan Smith
+ * GPL
+ */
+
+#include <tigcclib.h>
+#include "asm_vars.h"
+
+/* SOMETHING WENT HORRIBLY HORRIBLY WRONG
+ */
+void throw_error(char *message)
+{
+	return;
+}