While we do want to support GCOS, it'll be GCOS-3, and that is if we can find system tapes. We are actually planning another blog post soon that will touch on this.

Now, Multics does have GTSS (GCOS Time Sharing Simulator), which Dean has helped us get working.

There is an general information page available: https://dps8m.gitlab.io/sb/MR12.8/documentation/info_segment...

This facility is based on GCOS-3 4JS3, and it does work, although the software that we have available for it is minimal.

GCOS-8 is a different beast entirely. While there is the possibility that a future version of the simulator could theoretically run GCOS-8 in the future (as most of the work necessary overlaps with supporting CP-6), this is not something that we're going to support as GCOS-8 is a current commercial product.

If you want to run GCOS-8, you'll have to purchase an Atos BullSequana M9600 mainframe - https://atos.net/wp-content/uploads/2020/09/BullSequana_M_Br...

This is oriented towards Multics. As i understand it GCOS is heavily encumbered with license issues so it's pretty much inaccessible.