From 56eae1aca17d9cc91e95f1704c1c3b682729a9b0 Mon Sep 17 00:00:00 2001
From: Maurizio Porrato <maurizio.porrato@gmail.com>
Date: Wed, 22 Jan 2020 08:01:09 +0000
Subject: [PATCH] Added debug hardware IRQ to replace non standard HLT opcode

---
 dsim.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/dsim.c b/dsim.c
index 017ce46..883a0ee 100644
--- a/dsim.c
+++ b/dsim.c
@@ -62,8 +62,13 @@ struct dev_entry {
     void (*tick)();
 };
 
+void debug_irqh()
+{
+    running = false;
+}
+
 struct dev_entry iodevs[] = {
-    { 0, 0, 0, NULL, NULL, NULL, NULL}
+    { 0x6d53647c, 0x62e037d3, 0x00000000, debug_irqh, NULL, NULL, NULL },     /* Debug device */
 };
 
 uint16_t lit[] = {
@@ -421,11 +426,6 @@ void oHWI(uint16_t *a, uint16_t *b)
     }
 }
 
-void oHLT(uint16_t *a, uint16_t *b)
-{
-    running = false;
-}
-
 typedef void (*op_t)(uint16_t *, uint16_t *);
 
 const op_t ops[] = {
@@ -439,7 +439,7 @@ const op_t sops[] = {
     oNOP, oJSR, oNOP, oNOP, oNOP, oNOP, oNOP, oNOP,     /* 00-07 */
     oINT, oIAG, oIAS, oRFI, oIAQ, oNOP, oNOP, oNOP,     /* 08-0f */
     oHWN, oHWQ, oHWI, oNOP, oNOP, oNOP, oNOP, oNOP,     /* 10-17 */
-    oNOP, oNOP, oNOP, oNOP, oNOP, oNOP, oNOP, oHLT      /* 18-1f */
+    oNOP, oNOP, oNOP, oNOP, oNOP, oNOP, oNOP, oNOP      /* 18-1f */
 };
 
 void dumpregs()