From 9428e4744a0d2f903ba7542c7b7d5641a76a2949 Mon Sep 17 00:00:00 2001
From: Neil Webber <neil@webber.com>
Date: Wed, 8 May 2024 17:59:35 -0500
Subject: [PATCH] Verifying with some test code, SIMH generates
 ReservedInstruction for things like JMP R0 ... and now this code does the
 same (was AddressError)

---
 machine.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/machine.py b/machine.py
index 4adb9f9..5d627a7 100644
--- a/machine.py
+++ b/machine.py
@@ -423,7 +423,7 @@ class PDP11:
         # Note that in all READ cases b6 will be the newb6 (reusable)
         if (b6 & 0o70) == 0:
             if justEA:
-                raise PDPTraps.AddressError
+                raise PDPTraps.ReservedInstruction    # validated via SIMH
 
             match b6 & 0o07, value, opsize:
                 case Rn, None, 2: