Is there any open source/freeware TSO/ISP clone for PC?

Free as in beer. I can live without the source code.

Ab开发者_如何学Cout 10 years ago I saw a commercial product. Is there anything free now?

I found Gispf on SourceForge, but there are no downloads. Otherwise, I can't find a thing.

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Edit: I'd prefer something approaching the whole system, but could manage to live with the editor

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Edit" TSO is "the old Time-Sharing Option on IBM mainframes"

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Have tried anything listed on Dave's SPF Editor page