Yes there is AmigaOS 2.1, 3.0, 3.1, 3.5 and 3.9!
Any some UNIX/LINIX .
Your 600HD is eating some RAM so you really need to get that 1MB Chip RAM expansion to get games to run from HD, you can also get a SRAM PCMCIA card (upto 4MB) for 16-bit Fast RAM.
