As promised I've modified a version of pdisk so that it properly sets the 
partition flags as required by NetBSD (both mac68k and macppc).  This 
should allow users with IDE disks on 68k Macs and users with PPC Macs who 
want dual boot capability to set up their disks so that NetBSD can be 
installed with sysinst.

The function only works when you attempt to rename a UNIX type partition. 
 It will then prompt you for options.  You can set the partiton to be 
SWAP or it will default to a Usr type partition.  For Usr type partitions 
you will be asked if you want the partition to also carry the "root" 
attribute.  You will need at least one partition with "root" and at least 
one "SWAP".  If you use sysinst you will also need a separate "usr" 
partition.

The basic process is:

  1) Back up your disk!
  2) Invoke pdisk - both 68k and ppc versions are available
  3) Optionally delete any unused partitions to free up disk space
  4) Create new partitions for NetBSD.  If you use the "c" option they 
will
     default to be MkLinux partitions which will work for NetBSD.  If you 
use
     the "C" (capital) option you will need to specify the partition type
     which must be "Apple_UNIX_SVR2".
  5) Rename the UNIX partition(s) to force the flags to be set for NetBSD.
     Note: If you new partition name includes special characters like 
blanks
           you will need to enclose the name in quotes, i.e. "NetBSD 
Root".
  6) Write the modified partition map back to the disk with the "w" 
option.
  7) Re-boot and attempt installing NetBSD!

You can use the "V" option at the top level of pdisk to verify that the 
partitions really have been created on the disk and that they have the 
proper NetBSD flags.

Remember to back up your disks before starting!!!
Hope this helps, and good luck!
-bob

p.s.  The new sources and pre-built execuatables are at:
      ftp://murphy.dyndns.org/pub/map/pdisk.sea.hqx