The 256x and the 293x, that is, at:
http://www.assertiveincompetence.com/
Click on the left side button for "MPE iX & OS/390" to take you to the HP3000 site.
On the left are the "256x power" and "293x power" buttons respectively which will take you to the page with the instructions with the pictures.
The pages were provided by Terry Simpkins, as mentioned in a previous e-mail on the HP3000-L.
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Sidebar: I have posted the beta version of the Apache Java Web Server, but have not gotten around to creating a page with the instructions to set it up yet with a sample working configuration, but plan to shortly.