Jeremy, Thanks for instruction, I got everything OK.
install script runs OK and I used NFS to install and it is up NOW.
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tateyama# uname -a
NetBSD tateyama 1.2E NetBSD 1.2E (GENERIC) #0: Mon May 26 19:15:02 PDT 1997     jeremy@mobeius:/usr/home/netbsd/src/sys/arch/sun3x/compile/GENERIC sun3x
tateyama# 
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Terrific, Thanks a lot.

One thing, the text file
ftp://ftp.NetBSD.ORG/pub/NetBSD/NetBSD-1.2/sun3/INSTALL
should get patch

--- NetBSD-1.2--INSTALL-ooo	Tue Jul  1 23:50:30 1997
+++ NetBSD-1.2--INSTALL	Tue Jul  1 23:51:35 1997
@@ -560,7 +560,7 @@
 	set T = /dev/nrst0
 	mt -f $T rewind
 	foreach f (base etc comp games man misc text)
-	  gzip -d < $f.gz | dd of=$T bs=8k
+	  gzip -d < $f.tar.gz | dd of=$T bs=8k
 	end
 	mt -f $T rewind
 

Am I wrong ? But honestly, I got I/O error with this tape
(Possibly just a media problem), and I installed via NFS 
which is much easier to me.

Thanks a lot,
Makoto Fujiwara
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(藤原)