Code:

if c.uae_cpu_24bit_addressing.explicit:
    c.uae_cpu_24bit_addressing = c.uae_cpu_24bit_addressing.explicit
elif c.cpu == "68000":
    c.uae_cpu_24bit_addressing = "true"
elif c.cpu == "68010":
    c.uae_cpu_24bit_addressing = "true"
elif c.cpu == "68EC020":
    c.uae_cpu_24bit_addressing = "true"
elif c.cpu == "68020":
    c.uae_cpu_24bit_addressing = "false"
elif c.cpu == "68EC030":
    c.uae_cpu_24bit_addressing = "false"
elif c.cpu == "68030":
    c.uae_cpu_24bit_addressing = "false"
elif c.cpu == "68EC040":
    c.uae_cpu_24bit_addressing = "false"
elif c.cpu == "68LC040":
    c.uae_cpu_24bit_addressing = "false"
elif c.cpu == "68040-NOMMU":
    c.uae_cpu_24bit_addressing = "false"
elif c.cpu == "68040":
    c.uae_cpu_24bit_addressing = "false"
elif c.cpu == "68EC060":
    c.uae_cpu_24bit_addressing = "false"
elif c.cpu == "68LC060":
    c.uae_cpu_24bit_addressing = "false"
elif c.cpu == "68060-NOMMU":
    c.uae_cpu_24bit_addressing = "false"
elif c.cpu == "68060":
    c.uae_cpu_24bit_addressing = "false"
else:
    f.fail("Unknown CPU")