Re: What OS will work on this GS?

[Phoenyx <quazar@dcnet2000.com>]

As Mark mentioned, all the old 8 bit OS's. You should be able to boot
the GSOS disk to ProDos by holding the 8 key down while the system
starts up. You won't be able to do much but it will let you use
Applesoft Basic. IIRC, only two disks from that set are bootable, but
only one will boot ProDos.

-- 

Thank you for your time and interest. I hope it was helpful
or at least interesting.

Phoenyx,

Apple2 user since March 1984

Links to Phoenyx's pages:
preferred..... http://zip.to/Phoenyx_A2
alternate..... http://www.tinyangeldesigns.com/Apple2