The files

    pdp11.ps
    pdp11_34.ps

are PostScript vector-graphic renditions of the "pdp11" and
"pdp11/34" logos, respectively.

The image is set to black; if you wish to change this, open
the file in a text editor, and look for the line(s) beginning
"0 0 0 C".  These set the R,G,B values of the following lines.
For example, setting "255 0 0 C" would make the image pure red,
while "255 0 127 C" will give a shade of magenta.

The fonts are slightly modified versions of Futura (to get the
correct ascender and descender height on "pdp" and Helvetica
(stretched to get the correct aspect ratio).  When scaled
appropriately, they match a genuine DIGITAL PDP11 logo.