ProDOS is the name of the file system, just like Macs use HFS. GS/OS is the operating system which does the windows, toolbox, program launching, etc.

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Gotcha. Sounds like it is worthwhile dusting off that GS and getting GS/OS up and running. IIR it's still available from Apple's servers.

I'll do some poking around online and see what I need. Thanks.