Running WHDLoad on Amiga 600 is not recommended. I have a system which has a stock 68000 CPU, 4MB PCMCIA Fast RAM, 2MB Chip RAM, 512MB hard drive, 3.1 ROM, OS3.1 installed. The 68000 CPU is missing some IMPORTANT functions which WHDLoad often requires, so a lot of installs simply refuse to work. There are games which work fine, but a lot of them would really benefit from at least an 020 accelerator or better.
