144 lines
6.8 KiB
Markdown
144 lines
6.8 KiB
Markdown
---
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layout: post
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title: "PDP-11 Operator's Console (Front Panel) Demo"
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date: 2017-02-09 15:00:00
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permalink: /blog/2017/02/09/
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machines:
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- id: test1170
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type: pdp11
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debugger: true
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config: /devices/pdp11/machine/1170/panel/debugger/machine-slim.xml
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sticky: top
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---
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As I mentioned in the "[PDP-11 Tutorials](http://www.pcjs.org/blog/2017/01/03/)" blog post, I've been working on
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some methods for visually illustrating how machine components work. And the PDP-11/70 Operator's Console,
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with its daunting number of lights and switches, seemed like a good candidate.
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NOTE: I prefer the generic term "Front Panel" to describe DEC's Operator's Console, because it's less ambiguous and
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more generally recognized and understood.
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I still haven't written a *real* tutorial on the PDP-11/70 Front Panel, which will require starting at a much more
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fundamental level, explaining and demonstrating each switch in turn. However, I have made more progress on the basic
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elements that any tutorial or demo will need: allowing the user to walk through a step-by-step demonstration of some
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procedure.
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To illustrate, I've copied a multi-step procedure from the page on [Toggle-Ins](/devices/pdp11/machine/1170/panel/debugger/#toggle-ins)
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that shows how to use the PDP-11/70 Front Panel to verify that the Memory Management Unit (MMU) is operating properly.
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The procedure requires you to enter a small 3-instruction program at address 200 that will write a value (070707) to
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address 200, execute the program, and then verify that the MMU relocated that value to address 300 instead.
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As you click through each of the steps below, pay attention to the Front Panel. You should see all the switches being
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toggled at each stage. And as you complete each step, the button for that step will be disabled, so that you don't
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forget your place or accidentally repeat a step. And as you scroll through the steps, the machine should always remain
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visible.
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Give it a try!
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{% include machine.html id="test1170" %}
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### MMU Relocation Test
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From DEC's [PDP-11/70 Maintenance Service Guide](http://archive.pcjs.org/pubs/dec/pdp11/1170/PDP1170_Maintenance_Service_Guide_Apr88.pdf),
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Chapter 4:
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Use the following toggle-in to verify the correct operation of Memory Management Relocation.
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200/012737 MOV #400,@#177572 (load maint. bit in MMRO)
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202/000400
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204/177572
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206/012737 MOV #070707,@#200 (move 070707 to virtual 200)
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210/070707
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212/000200
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214/000000 HLT
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300/000300 Preset loc 300 to 300
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17772300/077406 Set Kernel I PDR 0 to R/W 4K page
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17772340/000001 Set Kernel I PAR 0 to (Base address 100)
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Load Address 200
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Start Display = 000216 (Halt@214)
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Load Address 300
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Exam Display = 070707 ... Relocation works
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The above "toggle-in" can broken down into the following steps.
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Step 1: Load ADDRESS register with 200.
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{% include machine-command.html type='clickOnce' label='LOAD 200' machine='test1170' command='script' value='set Panel SR 200; sleep 500; hold Panel LOAD 250' %}
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Step 2: Deposit 012737 at ADDRESS 200.
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{% include machine-command.html type='clickOnce' label='DEPOSIT 012737' machine='test1170' command='script' value='set Panel SR 012737; sleep 500; hold Panel DEP 250' %}
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Step 3: Deposit 000400 at ADDRESS 202.
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{% include machine-command.html type='clickOnce' label='DEPOSIT 000400' machine='test1170' command='script' value='set Panel SR 000400; sleep 500; hold Panel DEP 250' %}
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Step 4: Deposit 177572 at ADDRESS 204.
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{% include machine-command.html type='clickOnce' label='DEPOSIT 177572' machine='test1170' command='script' value='set Panel SR 177572; sleep 500; hold Panel DEP 250' %}
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Step 5: Deposit 012737 at ADDRESS 206.
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{% include machine-command.html type='clickOnce' label='DEPOSIT 012737' machine='test1170' command='script' value='set Panel SR 012737; sleep 500; hold Panel DEP 250' %}
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Step 6: Deposit 070707 at ADDRESS 210.
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{% include machine-command.html type='clickOnce' label='DEPOSIT 070707' machine='test1170' command='script' value='set Panel SR 070707; sleep 500; hold Panel DEP 250' %}
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Step 7: Deposit 000200 at ADDRESS 212.
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{% include machine-command.html type='clickOnce' label='DEPOSIT 000200' machine='test1170' command='script' value='set Panel SR 000200; sleep 500; hold Panel DEP 250' %}
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Step 8: Deposit 000000 at ADDRESS 214.
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{% include machine-command.html type='clickOnce' label='DEPOSIT 000000' machine='test1170' command='script' value='set Panel SR 000000; sleep 500; hold Panel DEP 250' %}
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Step 9: Load ADDRESS register with 300.
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{% include machine-command.html type='clickOnce' label='LOAD 300' machine='test1170' command='script' value='set Panel SR 300; sleep 500; hold Panel LOAD 250' %}
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Step 10: Deposit 300 at ADDRESS 300.
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{% include machine-command.html type='clickOnce' label='DEPOSIT 300' machine='test1170' command='script' value='hold Panel DEP 250' %}
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Step 11: Load ADDRESS register with 17772300.
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{% include machine-command.html type='clickOnce' label='LOAD 17772300' machine='test1170' command='script' value='set Panel SR 17772300; sleep 500; hold Panel LOAD 250' %}
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Step 12: Deposit 077406 at ADDRESS 17772300 ("Set Kernel I PDR 0 to R/W 4K page").
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{% include machine-command.html type='clickOnce' label='DEPOSIT 077406' machine='test1170' command='script' value='set Panel SR 077406; sleep 500; hold Panel DEP 250' %}
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Step 13: Load ADDRESS register with 17772340.
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{% include machine-command.html type='clickOnce' label='LOAD 17772340' machine='test1170' command='script' value='set Panel SR 17772340; sleep 500; hold Panel LOAD 250' %}
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Step 14: Deposit 000001 at ADDRESS 17772340 ("Set Kernel I PAR 0 to (Base address 100").
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{% include machine-command.html type='clickOnce' label='DEPOSIT 000001' machine='test1170' command='script' value='set Panel SR 000001; sleep 500; hold Panel DEP 250' %}
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Step 15: Load ADDRESS register with 200.
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{% include machine-command.html type='clickOnce' label='LOAD 200' machine='test1170' command='script' value='set Panel SR 200; sleep 500; hold Panel LOAD 250' %}
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Step 16: Set ENABLE and toggle START.
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{% include machine-command.html type='clickOnce' label='START' machine='test1170' command='script' value='set Panel ENABLE 1; sleep 500; hold Panel START 250' %}
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Step 17: Load ADDRESS register with 300.
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{% include machine-command.html type='clickOnce' label='LOAD 300' machine='test1170' command='script' value='set Panel SR 300; sleep 500; hold Panel LOAD 250' %}
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Step 18: Examine ADDRESS 300.
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{% include machine-command.html type='clickOnce' label='EXAM' machine='test1170' command='script' value='hold Panel EXAM 250' %}
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At this point, the DATA register should display `070707`. You can also use the PCjs Debugger's `rm` command to verify
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the contents of the DATA register, or use a Dump command (`dw 300 l1`) to dump memory location 300.
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*[@jeffpar](http://twitter.com/jeffpar)*
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*Feb 9, 2017*
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