DPS8/70M is a descendant of the 645. The /70 is a particular model in the line (speed, memory size, etc.) The M is the Mulitx suffix.

After the "merger" when Honeywell bought the GE computer dept, the Phoenix operation became Honeywell Large Information Systems Division, and they brought out a medium-scale integrated version of the GE 600 line as the Honeywell 6000 line. The Multics machine in this line was the Honeywell 6180, an improvement over the 645 in many areas. Subsequent Multics machines used the same processor architecture, with various master-mode-only tweaks to accommodate I/O evolution. But all were 36-bit, 8 index-register, A and Q register machines with many instructions in common.

One thing that changed in the 6180 and its descendants was that the GIOC was eliminated. The 6180 used a standard GCOS IOM plus a Datanet-30 descendant called a Datanet-355. Later Multics machines such as the DPS8/70M used other I/O arrangements inherited from GCOS. If you follow the Multics links page to the History of Bull, you'll find a French view of the subsequent history, and some information on John Couleur's disastrous "New System Architecture" which wasted many millions on features that were never used by GCOS and which caused the demise of Multics.

It could run Multics.

See System Design of a Computer for Time Sharing Applications and Multics Home

In an attempt at humor - one could say
" This particular DPS8/70M was born on a little ranch in Arizona and sold to the no-talk folks out by Friendship Airport, worked hard all its life and was retired, given to the NCM, loaned to CHM. "

• Multics Home
• Multics Hardware Features
• System Design of a Computer for Time Sharing Applications by E. L. Glaser and J. F. Couleur and G. A. Oliver
• "GE-635 Reference Manual" (preview version this site) from the transcriber Hans B Pufal
  The GE 625/635 instructon set was a non-virtual memory subset of the GE 645 and Dockmaster