SunOS 4.x boot disk layout

27 Mar 2005

...
   Yes, if the
filesystem really is a SunOS 4.* filesystem, it will be
 big-endian. 
 Even a SunOS 4.* filesystem written by a Sun 386i? 
Woo, I forgot about the roadrunner.  A 386i-written filesystem will
quite likely be little-endian.  (While I haven't actually checked, I
don't think Sun had endianness-independent UFS.  But it's not too
implausible that they had always-byteswapped-UFS support on the 386i,
for compatability with 68k/SPARC filesystems.)

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SunOS 4.x boot disk layout