-
Notifications
You must be signed in to change notification settings - Fork 0
/
rk11.html
236 lines (190 loc) · 10.5 KB
/
rk11.html
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>fritzm.github.io - PDP-11/45: RK11</title>
<meta name="description" content="">
<meta name="author" content="Fritz Mueller">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<!-- Le HTML5 shim, for IE6-8 support of HTML elements -->
<!--[if lt IE 9]>
<script src="https://fritzm.github.io/theme/html5.js"></script>
<![endif]-->
<!-- Le styles -->
<link href="https://fritzm.github.io/theme/bootstrap.min.css" rel="stylesheet">
<link href="https://fritzm.github.io/theme/bootstrap.min.responsive.css" rel="stylesheet">
<link href="https://fritzm.github.io/theme/local.css" rel="stylesheet">
<link href="https://fritzm.github.io/theme/pygments.css" rel="stylesheet">
<!-- Photoswipe -->
<link rel="stylesheet" href="https://fritzm.github.io/theme/photoswipe.css">
<link rel="stylesheet" href="https://fritzm.github.io/theme/default-skin/default-skin.css">
<script src="https://fritzm.github.io/theme/photoswipe.min.js"></script>
<script src="https://fritzm.github.io/theme/photoswipe-ui-default.min.js"></script>
<script src="https://fritzm.github.io/galleries.js"></script>
<script type="text/javascript">
var pswipe = function(gname, index) {
var pswpElement = document.querySelectorAll('.pswp')[0];
var items = galleries[gname];
var options = { index: index };
var gallery = new PhotoSwipe(pswpElement, PhotoSwipeUI_Default, items, options);
gallery.init();
};
</script>
<!-- So Firefox can bookmark->"abo this site" -->
<link href="https://fritzm.github.io/feeds/all.rss.xml" rel="alternate" title="fritzm.github.io" type="application/rss+xml">
</head>
<body>
<div class="navbar">
<div class="navbar-inner">
<div class="container">
<a class="btn btn-navbar" data-toggle="collapse" data-target=".nav-collapse">
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</a>
<a class="brand" href="https://fritzm.github.io">fritzm.github.io</a>
<div class="nav-collapse">
<ul class="nav">
</ul>
</div>
</div>
</div>
</div>
<div class="container">
<div class="content">
<div class="row">
<div class="span9">
<div class='article'>
<div class="content-title">
<h1>PDP-11/45: RK11</h1>
Sun 29 January 2017
by <a class="url fn" href="https://fritzm.github.io/author/fritz-mueller.html">Fritz Mueller</a>
</div>
<div><p>Finished up the cleanup and rebuild of the H720E for the RK11-C controller: reformed the big electrolytics
over a couple of days, and swapped out the tantalum filters on the regulator board (one of which had started
to leak) for some replacements. Tantalums of the correct form and value are crazy expensive, and since these
caps (C11-C17, C23) are banked resevoirs on the regulated rails their exact values are not critical. Went
with some aluminum electrolytics instead that worked out to a little more aggregate capacity on each bank.</p>
<p>My H720E is missing its top cover plate, so there was about 40 years worth of accumulated dust in there -- a
lot to clean up! I'm not sure if the cover was customarily left off to facilitate cooling of the regulator
board, or if it is just genuinely missing. Will see if the forums/lists have any wisdom here. Should not be
hard to fab a replacement if it is really supposed to be there.</p>
<p>Routed the inter-cabinet power control wiring, racked the RK11, and cabled everything up. This included
moving the M9301 bootstrap terminator over to slot 0, then rummaging through a box of BC11 bus cables for one
that was both long enough and in decent enough shape to connect the CPU and the RK11. Some of these bus
cables had period-correct labeling (see picture below :-)) Got a good tip off the cctalk mailing list
(thanks, Jerry!) to drape the BC11 with a service loop from the top-rear of the CPU rack, thus avoiding any
entanglement with the rack slides while moving the CPU cabinet in and out.</p>
<p>A 2000pF cap that was flown over the RK11 backplane (+5V to DR BUS DC LO L) had broken free of its pin
connectors; jury-rigged this with some arduino jumpers I had lying around, until I can track down some
appropriate replacement connectors.</p>
<p>Good news is that after this the machine still booted the M9301 bootstrap, and was still able to run and
pass diagnostics loaded via PDP11GUI. So, Unibus still working with the BC11 cable in place and termination
out at the RK11.</p>
<p>Started in with diagnostic ZRKJE0.BIC, which is the controller-only static test. This indicated:</p>
<div class="highlight"><pre><span></span>REGISTER NOT CLEARED
PC REGADD RECVD
002560 177416 040000
</pre></div>
<p>This is the RKDB register, implemented by two M203 R/S flip-flop modules in slots A21 and B21 (see sheet
RK11-C-10 in the RK11-C engineering drawings). Swapped these, and the stuck bit moved to the other half of
of the register, so looks like failed gate. Pulled, socketed, replaced, and diagnostic no longer reports
any stuck bits. Next diagnostic fail is:</p>
<div class="highlight"><pre><span></span>UNEXPECTED TIME OUT AT PC=004300
</pre></div>
<p>This is test #21 of the diagnostic, testing controller reset. Will need to do some reading up on the design
of the controller and the diagnostic source to understand how to troubleshoot it further. All for now!</p>
<p><img src='/images/pdp11/720e-caps_thumbnail_tall.jpg' title='H720e regulator card with refreshed caps' onclick='pswipe("pdp11",42);'/>
<img src='/images/pdp11/rk11-racked_thumbnail_tall.jpg' title='RK11-C controller installed in rack, with temporary jumper hack for flown cap' onclick='pswipe("pdp11",43);'/>
<img src='/images/pdp11/bc11-good_thumbnail_tall.jpg' title='A BC11-A bus cable, with vintage label' onclick='pswipe("pdp11",44);'/>
<img src='/images/pdp11/rk11-back_thumbnail_tall.jpg' title='RK11-C controller from the back, flipchips and cabling visible' onclick='pswipe("pdp11",45);'/>
<img src='/images/pdp11/m203_thumbnail_tall.jpg' title='A failing M203, the cause of a stuck bit in RK11 register RKDB' onclick='pswipe("pdp11",46);'/></p></div>
<hr>
</div>
</div>
<div class="span3">
<div class="well" style="padding: 8px 0; background-color: #FBFBFB;">
<ul class="nav nav-list">
<li class="nav-header">
Site
</li>
<li><a href="https://fritzm.github.io/archives.html">Archives</a>
<li><a href="https://fritzm.github.io/tags.html">Tags</a>
<li><a href="https://fritzm.github.io/feeds/all.rss.xml" rel="alternate">RSS feed</a></li>
</ul>
</div>
<div class="well" style="padding: 8px 0; background-color: #FBFBFB;">
<ul class="nav nav-list">
<li class="nav-header">
Categories
</li>
<li><a href="https://fritzm.github.io/category/arcade-games.html">Arcade Games</a></li>
<li><a href="https://fritzm.github.io/category/math.html">Math</a></li>
<li><a href="https://fritzm.github.io/category/micros.html">Micros</a></li>
<li><a href="https://fritzm.github.io/category/pdp-11.html">PDP-11</a></li>
<li><a href="https://fritzm.github.io/category/programming.html">Programming</a></li>
<li><a href="https://fritzm.github.io/category/radios.html">Radios</a></li>
</ul>
</div>
<div class="social">
<div class="well" style="padding: 8px 0; background-color: #FBFBFB;">
<ul class="nav nav-list">
<li class="nav-header">
Social
</li>
<li><a href="http://facebook.com/fritzmueller">facebook</a></li>
<li><a href="http://instagram.com/infrafritz">Instagram</a></li>
<li><a href="http://www.linkedin.com/pub/fritz-mueller/a/679/62/">LinkedIn</a></li>
<li><a href="http://jsfiddle.net/user/fritzm/fiddles/">JSFiddle</a></li>
<li><a href="https://github.com/fritzm">GitHub</a></li>
</ul>
</div>
</div>
</div>
</div> </div>
<footer>
<br />
<p><a href="https://fritzm.github.io">fritzm.github.io</a> © Fritz Mueller 2023</p>
</footer>
</div> <!-- /container -->
<!-- Photoswipe -->
<div class="pswp" tabindex="-1" role="dialog" aria-hidden="true">
<div class="pswp__bg"></div>
<div class="pswp__scroll-wrap">
<div class="pswp__container">
<div class="pswp__item"></div>
<div class="pswp__item"></div>
<div class="pswp__item"></div>
</div>
<div class="pswp__ui pswp__ui--hidden">
<div class="pswp__top-bar">
<div class="pswp__counter"></div>
<button class="pswp__button pswp__button--close" title="Close (Esc)"></button>
<button class="pswp__button pswp__button--share" title="Share"></button>
<button class="pswp__button pswp__button--fs" title="Toggle fullscreen"></button>
<button class="pswp__button pswp__button--zoom" title="Zoom in/out"></button>
<div class="pswp__preloader">
<div class="pswp__preloader__icn">
<div class="pswp__preloader__cut">
<div class="pswp__preloader__donut"></div>
</div>
</div>
</div>
</div>
<div class="pswp__share-modal pswp__share-modal--hidden pswp__single-tap">
<div class="pswp__share-tooltip"></div>
</div>
<button class="pswp__button pswp__button--arrow--left" title="Previous (arrow left)">
</button>
<button class="pswp__button pswp__button--arrow--right" title="Next (arrow right)">
</button>
<div class="pswp__caption">
<div class="pswp__caption__center"></div>
</div>
</div>
</div>
</div>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script>
<script src="https://fritzm.github.io/theme/bootstrap-collapse.js"></script>
</body>
</html>