Entropy gathering on Mac OS 9?

[KOverton]

I'm not a Mac programmer, but I'm playing proxy for them.  We will need to support Mac down to OS9 and I'd like an idea how they will seed the PRNG.  For instance, on Windows there's at least a last resort of RAND_screen().  On the MacOS 10 systems they probably have some sort of /dev/random available.  But I have no idea what support (if any) exists for pre-Mach Macs.  Does anybody know?

-- kov