Possible partitions are:
Device hd1: No known filesystem detected - Sector size 512B - Total
size 78150744KiB
Partition hd1,netbsd1: Filesystem type ufs1, (various fs stats)
Partition hd1,netbsd2: No known filesystem detected, ...
Partition hd1,netbsd4: No known filesystem detected, ...
Partition hd1,netbsd5: Filesystem type ufs1, ...
Partition hd1,msdos1: Filesystem type ufs1, (same stats as netbsd1)
So, I tried
grub> set root=(hd1,netbsd1)
grub> ls /
And it gives a list of what is/should be in the root directory.
However,
grub> chainloader +1
error: not a valid root device
grub> kernel netbsd-GENERIC
error: can't find command `kerne;'