booting rt11 v5.1 on an 11/45

28 Mar 2006

...

  If you don't then there's a wire-wrapped
jumper documented
 _somewhere_ in the printset that has to be in place to complete the grant
 chain over the slot where the KW11-L goes.  AHA! Now THAT is information I'd
like to know about. It sounds like if you 
 don't have an M787 and want to use the clock on the DW11-W, you need a 
 jumper to complete the grant chain over 1C. Sounds like I need that info! 
 Anyone know what the magic jumper is from/to? 
It's not just 'if you want to use a clock on a DL11-W'. That jumper 
completes the grant chain for one of the bus grant sigals (the one that 
is used by the line time clock interrupt), if you miss it out, then _no_ 
device on that priority level can interrup. It's like missing out a grant 
continuity card. 

Found it. It's C01R2 to C01V2. That is, it's on the C connector of the 
frontmost slot in the CPU backplane between pins R2 and V2.

You can check with an ohmmeter that those 2 pins are connected to see if 
the jumper is in place.

-tony

2025

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

2011

2010

2009

2008

2007

2006

2005

2004

2003

2002

2001

2000

1999

1998

1997

booting rt11 v5.1 on an 11/45