Attaching SIMH devices without halting simulation?

Paul Koning paulkoning at
Sun Dec 31 16:14:57 CST 2017

Typically you need to have devices online so the OS will see them at startup.  But for removable media devices (tapes and many disks) you may want to mount the media (image files) later on, and switch them at runtime, exactly as you would do with disk packs or tape reels on a real computer.


> On Dec 31, 2017, at 5:10 PM, william degnan via cctalk <cctalk at> wrote:
> I thought you set all devices you planned to use "online" so you could
> mount them later?  I don't simh vax much so thanks for the correction as to
> the procedure.  I mostly do pdp8 or pdp11 stuff, or esoteric hardware.
> Bill Degnan

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