You definitely need an accelerator if you want to run WHDLoad on A600. I have a similar A600 setup (check my sig file for details) and I find that very little installers work with 68000 CPU as it is missing some features which were only implemented with 68010 CPU (it says so in WHDLoad docs too, so I'm not suprised). Furthermore, I have 4MB of fast ram in my PCMCIA slot, and that doesn't help either. So with 4MB fast and 2MB chip ram, my memory requirements for WHDLoad are fine, however the stock 68000 CPU simply doesn't cut it, as the majority of stuff out there coded for WHDLoad requires at least 68010 CPU in order to work properly. For more info check out WHDLoad docs.