I just loaded the latest snapshot on a 5000/200 with a serial console.
However the kernel does not seem to like that:

>>boot
Boot: 5/rz0/netbsd
Size: 1034192+0+90116
Starting at 0x80030000

Using PROM serial output until serial drivers initialized
Copyright (c) 1982, 1986, 1989, 1991, 1993
        The Regents of the University of California.  All rights reserved.

NetBSD 1.2_ALPHA (NEWCONF) #1: Sun Jun 23 14:28:20 PDT 1996
    jonathan@Reno.DSG.Stanford.EDU:/usr/src/sys/arch/pmax/compile/NEWCONF
real mem = 58720256
avail mem = 50196480
using 1433 buffers containing 5869568 bytes of memory
mainbus0 (root)
cpu0 at mainbus0: MIPS R3000 CPU Rev. 2.0 with MIPS R3010 FPC Rev. 2.0
tc0 at mainbus0: 25 MHz clock
asicmatch: KN02     slot 7 offset 0x0 pri -1
(configuring KN02 system slot as asic)
asic0 at tc0 slot 7 offset 0x0asicattach: asic0

asicattach: entry 0, base addr bfc00000
 adding dc subslot 0 offset 200000 addr bfe00000
dc0 at asic0 offset 0x200000 priority

And that's all there is.  Any ideas?
-- 
Matt Thomas               Internet:   matt@3am-software.com
3am Software Foundry      WWW URL:    http://www.3am-software.com/bio/matt.html
Westford, MA              Disclaimer: I disavow all knowledge of this message