18-bit
DEC PDP-1, PDP-1 Documentation, PDP-1 Emulation, PDP-1 Music, PDP-1 Restoration Project portal
36-bit
DEC 36-bit Computers, Joe Smith's PDP-10, Nocrew's PDP-10 Stuff, PDP-10 Software Archive, PDP-6 Home Page
PDP-11
Field Guide to Qbus and Unibus Modules, Mentec, Metalab.unc.edu, PDP11 RT11 Games, pdp11.co.uk, Pdp11.org, RSTS-11 Library Entries, The PDP-11 FAQ, The PDP-11 Unix Preservation Society, Trailing-edge.com
Classic Computer Document Archive
1000's of scanned in documents relating to classic computers from the 1950s through 80s.
Classic Computing Mailing List
Mailing list of nearly 1000 members dedicated to preserve and archive classic computer documentation and software.
Digital Computer Collection and Info
Shows his collection of Digital Equipment Computers.
Doug Jones's DEC PDP-8 Index
All about the PDP-8 computer; emulators, documentation and history.
Highgate's PDP-8 Page
Documents for PDP-8 minicomputer, covering hardware, software, and supporting materials.
PDP-8 , PDP-15, PDP-1 Computer Restoration Informa
Pictures, interviews, and information about PDP-1 through PDP-15 computers.