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electronic:equipment:h500 [2021/06/13 23:20] – tonyelectronic:equipment:h500 [2026/10/12 21:02] (current) – tony
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 <html><p style="text-align:right;">Published 13 Jun 2021</p></html> <html><p style="text-align:right;">Published 13 Jun 2021</p></html>
 <html><p style="text-align:center;"><b><font size="6">DEC H-500 Computer Lab</font></b></p></html> <html><p style="text-align:center;"><b><font size="6">DEC H-500 Computer Lab</font></b></p></html>
-{{ :electronic:equipment:h500:dsc_2571a.jpg?200|DEC H-500}} 
 \\ \\
  
 ===== Overview ===== ===== Overview =====
-($445) H-500 110V, H-500-A 240V, with ($30) Computer Lab 916 patchcord assortment (107 of assorted lengths), and B-350 Computer Lab workbook. +To help train electrical engineers in digital electronics Digital Equipment Corporation (DEC) produced a digital logic trainer together with a training course.  It allows students to connect up various configurations of basic logic gates following a workbook to get a hands on idea of what it was all about. 
-($5) Computer Lab Teachers' Guide (8 1/2" x 11"), + 
-($3) Computer Lab Teaching Wall Poster (24" x 36")+<HTML> 
 +  <div class="shadows" style="text-align:center" class="media"> 
 +    <a href="/dokuwiki/_media/electronic/equipment/h500/dsc_2571a.jpg"><img src="/dokuwiki/_media/electronic/equipment/h500/dsc_2571a.jpg" width="80%" class="media" title=H-500 overview" alt="H-500 overview" /></a> 
 +     <div class="container"> 
 +      DEC H-500 Digital Logic Trainer 
 +    </div> 
 +  </div> 
 +</HTML> 
 + 
 +There is a 110V version (H-500) and a 240V version (H-500-A), but all the logic runs on 5V.  It came with a Computer Lab workbook (item B-350) and an assortment of 107 patch cords of assorted lengths from 2.75" to 24.75" (item "916").  There was also a Computer Lab Teaching Wall Poster (24" x 36"). 
 + 
 +{{ :electronic:equipment:h500:dec-clw-3.gif?300|H-500 Computer Lab Poster}} 
 ===== Hardware description ===== ===== Hardware description =====
 +The logic gates are provided by 12 TTL logic chips: 7473, 7400, 7420, 7450, 7400, 7473, 7473, 7410, 7420, 7450, 7410, 7473.  The chips are mounted on the under side of a PCB (item H500 PATCHCORD PANEL5004577 5404576B).  There is a separate PCB containing the input switches, output lights, oscillator, and power supply (**BEWARE** mains voltages are present on this board).
  
-====== References and Additional Resources ====== +There are 8 rocker switches for providing logic 0 or 1 inputs, and 3 momentary rocker switches to provide pulsed inputs.  Additionally there is also a variable resistor control for an oscillator that has 6 selectable clock ranges, 3 "fine" and 3 "coarse" 
-  * {{electronic:equipment:h500:computer_lab_workbook.pdf|H-500 Computer Lab Workbook}} +\\ 
-  * {{electronic:equipment:h500:digital_computer_lab_workbook_1969.pdf|H-500 Computer Lab Workbook}} copy 2 +\\ 
-  * {{electronic:equipment:h500:computerlabteachersguide.pdf|H500 Computer Lab Teachers Guide}}+\\ 
 +\\
  
-  * [[https://archive.org/details/bitsavers_dechandboobWorkbook1969_6837997|Some Thoughts from the Author of workbook]] +The patch cords are colour coded according to length: 
-  * [[https://www.instructables.com/DEC-H-500-Computer-Lab-Reproduction/|DEC H-500 Computer Lab Reproduction]] +{{ :electronic:equipment:h500:p6148949a.jpg}} 
-  * [[https://so-much-stuff.com/pdp8/computerlab/computerlab.php|DEC "Computer Lab"]]+ 
 +^Colour^Length^Quantity| 
 +^Brown|2.75"|20| 
 +^Red|4.75"|30| 
 +^Orange|6.75"|25| 
 +^Yellow|8.75"|20| 
 +^Green|16.75"|10| 
 +^Blue|24.75"|2| 
 + 
 +And they have uncommon tapered pins crimped onto each end: 
 + 
 +{{:electronic:equipment:h500:p6148952a.jpg?200}}{{:electronic:equipment:h500:p6148953a.jpg?100}}{{:electronic:equipment:h500:p6148956a.jpg?100}} 
 + 
 +\\ 
 +\\ 
 +I've got two versions, one with light bulbs as output, the other with red LEDs.  I'm not entirely sure whether the LEDs were a standard version, or whether someone has retrofitted them (possibly to replace failing light bulbs).
  
-<html><small><p>If any referenced page no longer exists, try looking for its URL on <a href="http://archive.org">http://archive.org</a>.</p></small></html> 
 \\ \\
 ---- ----
-{{:electronic:equipment:h500:dsc_2570b.jpg?400|DEC H-500 top view - LEDs}} +===== Schematics ===== 
-{{:electronic:equipment:h500:dsc_2573b.jpg?400|DEC H-500 bottom view}}+^DEC H-500 schematic :^ 
 +{{electronic:equipment:h500:h500_computer_lab.png|DEC H-500 schematic}} ((From Glenn Axelrod)) 
 +/* is this https://www.axelrodbroadcastsolutions.com Glen? */ 
 +/* Old image was electronic:equipment:h500:h500_schematic.png */ 
 +\\ 
 +---- 
 + 
 +===== Examples ===== 
 +^Example 1^ 
 +{{:electronic:equipment:h500:p6148894a.jpg?200|DEC H-500 label}} {{:electronic:equipment:h500:dsc_2578a.jpg?200|DEC H-500 label}} 
 + 
 +{{:electronic:equipment:h500:dsc_2570b.jpg?400|DEC H-500 top view - LEDs}} {{:electronic:equipment:h500:dsc_2573b.jpg?400|DEC H-500 bottom view}}
  
 {{:electronic:equipment:h500:dsc_2575a.jpg?200|DEC H-500 label}} {{:electronic:equipment:h500:dsc_2575a.jpg?200|DEC H-500 label}}
 {{:electronic:equipment:h500:dsc_2576a.jpg?200|DEC H-500 label}} {{:electronic:equipment:h500:dsc_2576a.jpg?200|DEC H-500 label}}
-{{:electronic:equipment:h500:dsc_2578a.jpg?200|DEC H-500 label}} 
  
 {{:electronic:equipment:h500:dsc_2579a.jpg?800|DEC H-500 disassembled view}} {{:electronic:equipment:h500:dsc_2579a.jpg?800|DEC H-500 disassembled view}}
  
 {{:electronic:equipment:h500:dsc_2580b.jpg?400|DEC H-500 inside view}} {{:electronic:equipment:h500:dsc_2580b.jpg?400|DEC H-500 inside view}}
 +
 +{{:electronic:equipment:h500:p6148885a.jpg?400|DEC H-500 mounting batten}} {{:electronic:equipment:h500:p6148883a.jpg?400|DEC H-500 mounting batten}}
 +
 +{{:electronic:equipment:h500:p6148886a.jpg?400|DEC H-500 led}}
 +
 +----
 +^Example 2^
 +{{:electronic:equipment:h500:p6148896a.jpg?200|DEC H-500 label}}
  
 {{:electronic:equipment:h500:dsc_2584b.jpg?400|DEC H-500 top view - incandescent}} {{:electronic:equipment:h500:dsc_2584b.jpg?400|DEC H-500 top view - incandescent}}
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 {{:electronic:equipment:h500:p6148898b.jpg?400|DEC H-500 inside view}} {{:electronic:equipment:h500:p6148898b.jpg?400|DEC H-500 inside view}}
  
 +{{:electronic:equipment:h500:p6148928a.jpg?400|DEC H-500 light}}
 +
 +\\
 +\\
 +
 +====== References and Additional Resources ======
 +  * {{electronic:equipment:h500:computer_lab_workbook.pdf|H-500 Computer Lab Workbook}}
 +  * {{electronic:equipment:h500:digital_computer_lab_workbook_1969.pdf|H-500 Computer Lab Workbook}} copy 2
 +  * {{electronic:equipment:h500:computerlabteachersguide.pdf|H500 Computer Lab Teachers Guide}}
 +
 +  * [[https://archive.org/details/bitsavers_dechandboobWorkbook1969_6837997|Some Thoughts from the Author of workbook, John Hughes]]
 +  * [[https://www.instructables.com/DEC-H-500-Computer-Lab-Reproduction/|DEC H-500 Computer Lab Reproduction]]
 +    * [[https://hackaday.io/project/170232-dec-h-500-computer-lab-reproduction/log/185600-the-designer-of-the-original-h-500-computer-lab-reaches-out|Notes from John Hughes about Computer Lab]]
 +    * [[https://hackaday.io/project/170232-dec-h-500-computer-lab-reproduction/log/185604-more-from-john-hughes|More notes from John Hughes]]
 +  * [[https://so-much-stuff.com/pdp8/computerlab/computerlab.php|Vince Slyngstad's DEC "Computer Lab" page]]
 +  * [[http://www.decodesystems.com/dec-clw.html|DEC Computer Lab]]
 +
 +<html><small><p>If any referenced page no longer exists, try looking for its URL on <a href="http://archive.org">http://archive.org</a>.</p></small></html>
 +\\
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electronic/equipment/h500.1623626408.txt.gz · Last modified: 2021/06/13 23:20 by tony
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