The Compuserve Hard Drive

How I Couldn’t Stop Poking at Mysterious CompuServe Server Hard Disk Images
SC-40 booting (taken from Compuserve PDP-10 SC-40 Boot Up)Preface
This is about digital archeology. Manipulating the disk images
The CompuServe system used non-standard PDP-10-based hardware along with a custom version of TOPS-10. The differences in disk layout between a PDP-10 and a SC-40, presumably caused by the SCSI controller and/or the patches to the operating system, seemed impossible to overcome by trial and error.

Source: medium.com