From 9e0e2313b00beba6d524228c3627a6beb8f57777 Mon Sep 17 00:00:00 2001
From: Jeff <Jeff@pcjs.org>
Date: Sat, 19 Nov 2016 12:07:59 -0800
Subject: [PATCH] More information about the 11/70 CPU exerciser test
 (paper-tape version)

---
 apps/pdp11/tapes/diags/README.md              | 21 ++++++++++---------
 .../1170/panel/debugger/cpuexer/README.md     | 12 +++++++++++
 .../1170/panel/debugger/cpuexer/machine.xml   | 13 ++++++++++++
 3 files changed, 36 insertions(+), 10 deletions(-)
 create mode 100644 devices/pdp11/machine/1170/panel/debugger/cpuexer/README.md
 create mode 100644 devices/pdp11/machine/1170/panel/debugger/cpuexer/machine.xml

diff --git a/apps/pdp11/tapes/diags/README.md b/apps/pdp11/tapes/diags/README.md
index 72879b922..32b753c2b 100644
--- a/apps/pdp11/tapes/diags/README.md
+++ b/apps/pdp11/tapes/diags/README.md
@@ -242,7 +242,7 @@ MD-11 11/70 CPU EXERCISER
 -------------------------
 
 When started in a PDP-11/70 machine with no disk drives attached (or only RL01/RL02 drives), this diagnostic
-displays the following startup text:
+displays the following startup information:
 
 	MAINDEC-11-DEQKC-B...PDP 11/70 CPU EXERCISOR
 	OPT.CP=145406
@@ -336,15 +336,16 @@ Here's an excerpt:
 	        MOV     @#20000,20000(SP)
 	        BR      3$              ; BRANCH OVER NON KERNEL MODE TESTS
 
-In my case, after executing:
+This test uncovered a number of stack overflow-related issues that PDPjs needed to resolve,
+including the fact that none of the "deferred" addressing modes (3, 5, or 7) apparently trigger a
+stack overflow; eg:
 
-    021734: 057636 000000          BIS   @000000(SP),@(SP)+     ;cycles=17
+	R0=000000 R1=154112 R2=155754 R3=000376 R4=160316 R5=153412
+	SP=000376 PC=021734 PS=000340 IR=000000 SL=000377 T0 N0 Z0 V0 C0
+    021734: 057636 000000          BIS   @000000(SP),@(SP)+
 
-the code trapped to vector 4:
+whereas mode 6 *does*; eg:
 
-    trapped to 004 (YELLOW)
-    R0=000000 R1=154112 R2=155754 R3=000376 R4=160316 R5=153412
-    SP=000372 PC=022014 PS=000340 IR=000000 SL=000377 T0 N0 Z0 V0 C0
-    022014: 012600                 MOV   (SP)+,R0               ;cycles=0
-
-where it then dropped into an `EMT` instruction and reported an error.
+	R0=001437 R1=154112 R2=000040 R3=000376 R4=160316 R5=153412 
+	SP=000376 PC=022074 PS=000340 IR=000000 SL=000377 T0 N0 Z0 V0 C0 
+	022074: 050666 177776          BIS   SP,177776(SP)
diff --git a/devices/pdp11/machine/1170/panel/debugger/cpuexer/README.md b/devices/pdp11/machine/1170/panel/debugger/cpuexer/README.md
new file mode 100644
index 000000000..f67ee1582
--- /dev/null
+++ b/devices/pdp11/machine/1170/panel/debugger/cpuexer/README.md
@@ -0,0 +1,12 @@
+---
+layout: page
+title: PDP-11/70 with Front Panel and Debugger
+permalink: /devices/pdp11/machine/1170/panel/debugger/cpuexer/
+machines:
+  - id: test1170
+    type: pdp11
+    debugger: true
+    autoStart: true
+---
+
+{% include machine.html id="test1170" %}
diff --git a/devices/pdp11/machine/1170/panel/debugger/cpuexer/machine.xml b/devices/pdp11/machine/1170/panel/debugger/cpuexer/machine.xml
new file mode 100644
index 000000000..59582cd13
--- /dev/null
+++ b/devices/pdp11/machine/1170/panel/debugger/cpuexer/machine.xml
@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<?xml-stylesheet type="text/xsl" href="/versions/pdpjs/1.30.3/machine.xsl"?>
+<machine id="test1170" class="pdp11" border="1" pos="center" background="#FAEBD7">
+	<name pos="center">PDP-11/70 with 256Kb, Front Panel and Debugger</name>
+	<computer id="computer" busWidth="22"/>
+	<cpu id="cpu" model="1170" cycles="6666667"/>
+	<ram id="ram" addr="0x00000" size="0x40000" file="/apps/pdp11/tapes/diags/MAINDEC-11-DEQKC-B1-PB.json"/>
+	<device id="default" type="default"/>
+	<serial id="dl11" adapter="0" binding="print" upperCase="true"/>
+	<panel ref="/devices/pdp11/panel/1170/debugger/front.xml"/>
+	<debugger id="debugger" base="8" messages="" commands="bp 023534"/>
+	<device ref="/devices/pdp11/pc11/default.xml"/>
+</machine>