@runequester
OS 3.1 should be fine for Final Writer 97. Not sure how much RAM is required. My manual is from an earlier version and says "Final Writer will work on any Amiga with at least 2.5 megabytes of available internal memory." For sure, it requires a hard disk.
I used Final Writer on my A2000HD with 5 megabytes of RAM and no accelerator card (using the stock 68000 CPU). I went through a few upgrades to Final Writer 97 and it worked fine.
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redfox