From ef1f5b75b9d22b9c693f17af7727f32efa71ba61 Mon Sep 17 00:00:00 2001
From: Neil Webber <neil@webber.com>
Date: Mon, 4 Sep 2023 13:29:20 -0500
Subject: [PATCH] handle missing rp.disk

---
 machine.py | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/machine.py b/machine.py
index f69f10d..064a8ba 100644
--- a/machine.py
+++ b/machine.py
@@ -243,7 +243,14 @@ class PDP11:
         # but of course must be instantiated
         if console:                        # it's helpful to disable for tests
             self._KL = KL11(self.ub)
-        self._RP = RPRM(self.ub)
+        try:
+            rp = RPRM(self.ub)
+        except FileNotFoundError:
+            self.logger.info("NO DISK DRIVE FILE FOUND; DISK DISABLED")
+        else:
+            self._RP = rp
+
+        # line clock
         self._KW = KW11(self.ub)
 
     def physRW(self, physaddr, value=None):