my name is marco. I`am a "new" PDP8 User.
Cool!
  I have an PDP8 with no software and documentation came
with it.
 Now im digging around the web for the MAINDEC-8E-D1AB-PB 4K Memory
 Checkboard test.
 Could somebody have an Image of that papertape for me? 
I have the earlier version (D1AA) here:
http://www.so-much-stuff.com/pdp8/tapes/maindec.html
The -pb should be ready to use.
    Vince