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, 5 insertions, 2 deletions

diff --git a/loader.c b/loader.c
index 9cd16fd..bb7bd7b 100644
--- a/loader.c
+++ b/loader.c
@@ -8,9 +8,11 @@
 #include <tigcclib.h>
 #include "asm_vars.h"
 
+#include "680.h"
+
 HANDLE page_handles[256];
 
-char infloop[16] = { 0xc3, 0, 0, 0 };
+char infloop[16] = { 0xC3, 0x40, 0, 0, 0, 0 };
 
 void init_load(void);
 void *deref_page(int);
@@ -55,7 +57,8 @@ void init_load(void)
 
 	mem_page_0 = pages[0];
 	mem_page_loc_0 = 0;
-	mem_page_1 = pages[0x1f];
+//	mem_page_1 = pages[0x1f];
+	mem_page_1 = infloop;
 	mem_page_loc_1 = 0x1f;
 	mem_page_2 = pages[0];
 	mem_page_loc_2 = 0;