Thanks Bob, the answer for your question is not ready,
for I am not sure the reproducing the same situation.
(I will do that later anyway.)

I wrote:
>   +-------------------------------+
>   |  Select your choice           |
>   |                               |
>   | >a: Use only part of the disk |
>   |  b: Use the entire disk       |
>   +-------------------------------+

> (ii)
>  Edit Disk Partition Map: The Map on the disk has been scanned for all
>  user-level partitions, but only those usable by NetBSD are displayed. 
>  The
>  partition table currently looks like:
>
>  Part      start       size fstype use       mount point (name)
>  ---- ---------- ---------- ------ --------- ------------------

One bad thing for me was that:
   >a: Use only part of the disk 
should NOT be selected unless we have any partitions on the disk.
If I got above empty partition table, I needed to back to select the
line 

>   |  b: Use the entire disk      

Am I right ?

(1) no APM disk                ... will take care and go to (2)
(2) APM disk but no partition  ... > b: Use the entire disk   
(3) APM disk with partition    ... > a: Use only part of the disk 
                             (or if scratching them out,go to (2))

In summary, (2) should select b: Use the entire disk   

May be I will find out the answer at port-mac68k ?
---
Makoto Fujiwara, 
Chiba, Japan, Narita Airport and Disneyland prefecture.