DEC TU56 dual drive and it's modules - test-drb@ccmp.vtda.org

16 May 2014

...
  Date: Fri, 16 May 2014 08:42:57 +0200
 From: Marco Rauhut <marco at familie-rauhut.eu>
 To: General Discussion: On-Topic and Off-Topic Posts
 	<cctalk at classiccmp.org>
 Subject: DEC TU56 dual drive and it's modules
 Message-ID: <5375B371.6090107 at familie-rauhut.eu>
 Content-Type: text/plain; charset=ISO-8859-15; format=flowed

 My question before first "smoke test" is done is....
 In the engeneering drawings "Module Utilization" are shown special
 places for each module. In my drive the Modules on different places
 then in the drawing.
 Is the backplane a real bussystem or got i use the ports shown in
 drawings?
  Congratulations, the TU56 is quite sought after.

The TU56 backplane isn't a bussystem as you describe it (i.e. not like the
pdp8 omnibus). The wiring is point to point between the various module
positions and the modules have predetermined positions. There will likely be
some differently coloured wiring modifications too.

If yours are in different places to the engineering drawings it may be
wrongly assembled - check some intermodule signals to confirm.

You may or may not need some G888 modules depending on which controller you
have or plan to use.

Bob