Hopefully some useful links to other websites.
First a big thank you to Agilent Technologies www.home.agilent.com for providing so much information on obsolete Hewlett Packard equipment, an essential internet technical resource. Changed their name again to Keysight Technologies www.keysight.com
There are some excellent forums for Hewlett Packard and Tektronix equipment on Yahoo Groups http://groups.yahoo.com/ which provide lots of information and help with specific problems.
Equipment manuals are often available for free download in .pdf format by searching in www.google.com or other search engines. I have also had very good service from www.artekmanuals.com with their ftp downloads.
Although expensive, www.glkinst.com manufacture test equipment inter-connecting cables of good quality.