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> first I've heard of COS and (b) I cant find jack on it.

If you can lay your hands on some issues of BYTE and PC Magazine (Ziff Davis) dated between 1985 and 1990, you would find plenty on RM COBOL.

That's another angle of the confusion. Most of the search results are old magazines with basically the same advertisements. They advertise both RM/COBOL and RM/COS. They're different products. There's a bit of RM/COBOL information given it basically worked its way into MicroFocus. It's RM/COS that they never describe past "an operating system specifically for COBOL."

Note: It's going to be irritating if I find it's another DOS variant after all this work haha.

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