Many years ago my father recovered a big lot of documentation for a PDP-15 system that had been in use at Philips in Sweden. Since the manuals also included the source listings for REDAC SOFTWARE LIMITED PCB layout suite REDAL 3 MARK 7, it appears to be likely that this PDP-15 once was used for PCB layout. However the actual hardware were already scrapped or given away. The lot includes documentation on the RSX-PLUS-III operating system and XVM/DOS. General PDP-15 documentation
DOS-15 Documentation
DOS/XVM documentation:
RSX-PLUS III
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