Replying to my own message.  Hmmm....

At 3:36 AM -0700 8/26/98, Monroe Williams wrote:
[...]
>Should it matter that I'm using 'kbd' for input 
>and '/chaos/control' for output instead of the serial console?

Since writing this, I have found that using serial console allows 
me to get much further.  I can now get all the way through booting, 
but the "Terminal type? [sun]" prompt doesn't respond to input.  
I don't know whether it's hung or just not getting input properly.

I've tried pulling out all PCI cards, motherboard cache, and various 
amounts of memory, with no change in symptoms.

Ideas, anyone?
-- monroe

Here's the boot log so far:
------
0 > boot fd:0 -
>> NetBSD/macppc OpenFirmware Boot, Revision 1.1
>> (tsubai@kanea, Mon Jul 27 22:34:01 JST 1998)
Booting fd/netbsd
2651732@0x100000+140952@0x387654
 start=0x100000
Copyright (c) 1996, 1997, 1998
    The NetBSD Foundation, Inc.  All rights reserved.
Copyright (c) 1982, 1986, 1989, 1991, 1993
    The Regents of the University of California.  All rights reserved.

NetBSD 1.3F (INSTALL) #0: Wed Jul 29 12:51:49 JST 1998
    tsubai@kanea:/c/0725/src/sys/arch/macppc/compile/INSTALL
CPU: Version 8 (Revision 202)
real mem  = 167772160
avail mem = 156696576
using 800 buffers containing 3276800 bytes of memory
mainbus0 (root)
cpu0 at mainbus0
pci0 at mainbus0 bus 0
pci0: i/o enabled, memory enabled
pchb0 at pci0 dev 11 function 0
pchb0: vendor 0x106b product 0x0001 (rev. 0x03)
vendor 0x121a product 0x0001 (video multimedia, revision 0x02) at pci0 dev 13 function 0 not configured
vendor 0x1045 product 0xc861 (USB serial bus, interface 0x10, revision 0x10) at pci0 dev 15 function 0 not configured
obio0 at pci0 dev 16 function 0: addr 0xf3000000
esp0 at obio0 offset 0x10000 irq 12: NCR53C94, 25MHz, SCSI ID 7
esp0: SCSI bus reset
scsibus0 at esp0: 8 targets
mc0 at obio0 offset 0x11000: irq 14,2,3: address 08:00:07:7f:b8:f7
zsc0 at obio0 offset 0x13000: irq 15,16
zstty0 at zsc0 channel 0 (console)
zstty1 at zsc0 channel 1
awacs at obio0 offset 0x14000 not configured
swim3 at obio0 offset 0x15000 not configured
adb0 at obio0 offset 0x16000 irq 18
adb: extended keyboard at 2
adb: 100 dpi mouse at 3
mesh at obio0 offset 0x18000 not configured
nvram0 at obio0 offset 0x1d000
pci1 at mainbus0 bus 0
pci1: i/o enabled, memory enabled
grfati0 at pci1 dev 11 function 0
vendor 0x106b product 0x0004 (undefined subclass 0x00, revision 0x01) at pci1 dev 13 function 0 not configured
md0: internal 1536K image area
boot device: <unknown>
root on md0a dumps on md0b
WARNING: clock gained 35 days -- CHECK AND RESET THE DATE!
root file system type: ffs
erase ^H, werase ^W, kill ^U, intr ^C, status ^T
Terminal type? [sun]
------