I remember buying a bulky external 2MB RAM extension (I think I bought another 2MB) before that for my Amiga 500 running a full desktop OS already on 512k 'Chipmemory' using it mostly to actually as a TempFS to accelerate loading. That was beginning to mid 90s, I guess. But running netbsd on the Amiga meant that you would already at that time need 16MB of RAM and a CPU with an MMU as well as an HDD (my friend across the street did that with his A1200 I think I remember). You would only do it if you wanted more networking beyond BBS I guess.