Questa 2020.1: Error: (vsim-3296) Unknown option '-restore' - Questa 2020.1: Error: (vsim-3296) Unknown option '-restore' I'm trying to restore a checkpoint of a very long simulation using $ vsim -restore checkpoint Reading pref.tcl ** Error: (vsim-3296) Unknown option '-restore'. Use the -help option for complete vsim usage. Errors: 1, Warnings: 0 From the Questa SIM Command Reference Manual : restore Restores the state of a simulation that was saved with a checkpoint command during the current invocation of vsim (a “warm restore”). Syntax restore <pathname> Description The restored items are: simulation kernel state, vsim.wlf file, HDL objects listed in the List and Wave windows, file pointer positions for files opened under VHDL and under Verilog $fopen, and the saved state of foreign architectures. Use this command to restore while running vsim. To start up vsim and simultaneously restore a previously-saved checkpoint, use vsim -restore (called a "cold restore"). The last line: `use vsim -restore`. Opening vsim and then "restore checkpoint": ("checkpoint" is the filename) $ vsim -help restore Model Technology ModelSim - INTEL FPGA STARTER EDITION vsim 2020.1 Simulator 2020.02 Feb 28 2020 ** Error (suppressible): (vsim-13356) Option "restore" is unrecognized Category for vsim tool. What am I missing? Regards, Replies: Re: Questa 2020.1: Error: (vsim-3296) Unknown option '-restore' I’m glad that your question has been addressed, I now transition this thread to community support. If you have a new question, feel free to open a new thread to get the support from Intel experts. Otherwise, the community users will continue to help you on this thread. Thank you. p/s: If any answer from community or Intel support are helpful, please feel free to mark as solution and give Kudos. Replies: Re: Questa 2020.1: Error: (vsim-3296) Unknown option '-restore' @SyafieqS I've tried with Quartus and it has worked! Modelsim doesn't support this feature. Please feel free to close this ticket. Thank you for your help! Regards, Replies: Re: Questa 2020.1: Error: (vsim-3296) Unknown option '-restore' Alexis. Sure let me know if the issue still persist or any update Replies: Re: Questa 2020.1: Error: (vsim-3296) Unknown option '-restore' The PATH might have been mixed... (simulated and snapshot saved with Questa but tried to open it on a desktop with modelsim in the path...) Sorry about that @SyafieqS ! Let me try again with Questa. Replies: Re: Questa 2020.1: Error: (vsim-3296) Unknown option '-restore' Alexis, Are you using Modelsim or Questasim? The reason is from the image you attached seem like you are using Modelsim as mentioned ""Model Technology ModelSim - INTEL FPGA STARTER EDITION vsim 2020.1 Simulator 2020.02 Feb 28 2020"" ""Modelsim>"" Replies: Re: Questa 2020.1: Error: (vsim-3296) Unknown option '-restore' Hi @SyafieqS , this has nothing to do with Quartus, it's a questa/modelsim feature documented in its user manual. Please let me know since we need to be able to open results of a long running simulation in another computer, and eventually continue the simulation. Replies: Re: Questa 2020.1: Error: (vsim-3296) Unknown option '-restore' Alexis, As Questa is quite new to Quartus this might be a limitation. Let me try to reproduce the issue and let you know.