Updated sources as of 5/18, and i now get loss of keyboard commands
and eventual system crash with 1.128GB of memory
/var/log/messages reports prior to system halt:
May 20 11:22:50 casey205 /netbsd: sd0(isp0:0:0:0): generic HBA error
May 20 11:24:31 casey205 last message repeated 6699 times
May 20 11:26:42 casey205 last message repeated 6943 times
May 20 11:27:16 casey205 xterm: /etc/pwd.db: Bad address
running with 640MB of ram the machine is stable, full dmesg:

[ using 535120 bytes of netbsd ELF symbol table ]
consinit: not using prom console
Copyright (c) 1996, 1997, 1998, 1999, 2000, 2001, 2002
    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 1.5ZC (TODAY) #0: Mon May 20 09:29:56 EDT 2002
    mel@casey205.doodle.com:/usr/src/sys/arch/alpha/compile/TODAY
Digital Personal WorkStation 433au, 432MHz, s/n
8192 byte page size, 1 processor.
total memory = 640 MB
(1896 KB reserved for PROM, 638 MB used by NetBSD)
avail memory = 586 MB
using 4096 buffers containing 32768 KB of memory
mainbus0 (root)
cpu0 at mainbus0: ID 0 (primary), 21164A-0
cpu0: Architecture extensions: 1<BWX>
cia0 at mainbus0: DECchip 2117x Core Logic Chipset (Pyxis), pass 1
cia0: extended capabilities: 1<BWEN>
cia0: using BWX for PCI config access
sio_intr_setup: 8 level-triggered
pci0 at cia0 bus 0
pci0: i/o space, memory space enabled, rd/line, rd/mult, wr/inv ok
tlp0 at pci0 dev 3 function 0: DECchip 21143 Ethernet, pass 3.0
tlp0: interrupting at dec 550 irq 0
tlp0: DEC , Ethernet address 00:00:f8:76:5a:9f
nsphy0 at tlp0 phy 5: DP83840 10/100 media interface, rev. 1
nsphy0: 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto
tlp0: 10baseT, 10baseT-FDX, 10base2, 10base5
sio0 at pci0 dev 7 function 0: Contaq Microsystems 82C693 PCI-ISA Bridge
(rev. 0x00)
pciide0 at pci0 dev 7 function 1: Cypress 82C693 IDE Controller (rev.
0x00)
pciide0: bus-master DMA support present
pciide0: primary channel wired to compatibility mode
pciide0: disabling primary channel (no drives)
pciide1 at pci0 dev 7 function 2: Cypress 82C693 IDE Controller (rev.
0x00)
pciide1: hardware does not support DMA
pciide1: primary channel wired to compatibility mode
atapibus0 at pciide1 channel 0: 2 targets
cd0 at atapibus0 drive 0: <TOSHIBA CD-ROM XM-6302B, , 1017> type 5 cdrom
removable
cd0: 32-bit data port
cd0: drive supports PIO mode 4, DMA mode 2
pciide1: secondary channel interrupting at isa irq 15
cd0(pciide1:0:0): using PIO mode 4
ohci0 at pci0 dev 7 function 3: Contaq Microsystems 82C693 PCI-ISA
Bridge (rev. 0x00)
ohci0: interrupting at isa irq 10
ohci0: OHCI version 1.0, legacy support
usb0 at ohci0: USB revision 1.0
uhub0 at usb0
uhub0: Contaq Microsys OHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub0: 2 ports with 2 removable, self powered
cz0 at pci0 dev 11 function 0: Cyclades-Z multiport serial
cz0: Cyclades-8Zo ver. 1, 8 channels (ttyCZ0000..ttyCZ0007), firmware
3.3.1
cz0: polling mode, 20 ms interval (20 ticks)
ppb0 at pci0 dev 20 function 0: Digital Equipment DECchip 21152 PCI-PCI
Bridge (rev. 0x02)
pci1 at ppb0 bus 1
pci1: i/o space, memory space enabled, rd/line, wr/inv ok
isp0 at pci1 dev 4 function 0: QLogic 1020 Ultra Wide SCSI HBA
isp0: interrupting at dec 550 irq 3
isp0: invalid NVRAM header
scsibus0 at isp0: 16 targets, 8 luns per target
vga0 at pci1 dev 8 function 0: Texas Instruments TVP4020 Permedia 2
(rev. 0x01)
wsdisplay0 at vga0 kbdmux 1: console (80x25, vt100 emulation)
wsmux1: connecting to wsdisplay0
isa0 at sio0
com0 at isa0 port 0x3f8-0x3ff irq 4: ns16550a, working fifo
com1 at isa0 port 0x2f8-0x2ff irq 3: ns16550a, working fifo
pckbc0 at isa0 port 0x60-0x64
pckbd0 at pckbc0 (kbd slot)
pckbc0: using irq 1 for kbd slot
wskbd0 at pckbd0: console keyboard, using wsdisplay0
pms0 at pckbc0 (aux slot)
pckbc0: using irq 12 for aux slot
wsmouse0 at pms0 mux 0
lpt0 at isa0 port 0x3bc-0x3bf irq 7
ess0 at isa0 port 0x220-0x22f irq 5 drq 1,5
ess0: ESS Technology ES1887 [version 0x688b]
alpha_shared_intr_establish: isa irq 5: warning: using edge-triggered on
level-triggered
ess0: audio1 interrupting at irq 5
ess0: audio2 polled
audio0 at ess0: full duplex, mmap, independent
opl0 at ess0: model OPL3
midi0 at opl0: ESS Yamaha OPL3
pcppi0 at isa0 port 0x61
midi1 at pcppi0: PC speaker
spkr0 at pcppi0
isabeep0 at pcppi0
isapnp0 at isa0 port 0x279: ISA Plug 'n Play device support
fdc0 at isa0 port 0x3f0-0x3f7 irq 6 drq 2
fd0 at fdc0 drive 0: 1.44MB, 80 cyl, 2 head, 18 sec
mcclock0 at isa0 port 0x70-0x71: mc146818 or compatible
pcic1 at isa0 port 0x3e2-0x3e3 iomem 0xcc000-0xd0fff irq
pcic1: controller 0 (Intel 82365SL Revision 1) has sockets A and B
pcic1: controller 1 (Intel 82365SL Revision 1) has no sockets
pcmcia0 at pcic1 controller 0 socket 0
pcmcia1 at pcic1 controller 0 socket 1
isapnp0: no ISA Plug 'n Play devices found
scsibus0: waiting 2 seconds for devices to settle...
sd0 at scsibus0 target 0 lun 0: <SEAGATE, ST39236LW, 0010> SCSI3
0/direct fixed
sd0: 8761 MB, 14384 cyl, 3 head, 415 sec, 512 bytes/sect x 17942584
sectors
sd0: sync (50.0ns offset 8), 16-bit (40.000MB/s) transfers, tagged
queueing
pcic1: controller 0 detecting irqs with mask 0xdeb8:..9..11..14
pcic1: using irq 9 for socket events
wi0 at pcmcia0 function 0: Lucent Technologies, WaveLAN/IEEE, Version
01.01
wi0: port 0x600-0x63fpcmcia0: card irq 11
 802.11 address 00:02:2d:2e:a9:1d
wi0: using Lucent Technologies, WaveLAN/IEEE
wi0: Lucent Firmware: Station (7.28.1)
root on sd0a dumps on sd0b
root file system type: ffs
IP Filter: v3.4.27 initialized.  Default = pass all, Logging = disabled
pcmcia0: card irq 11
stray isa irq 11
wsdisplay0: screen 1 added (80x25, vt100 emulation)
wsdisplay0: screen 2 added (80x25, vt100 emulation)
wsdisplay0: screen 3 added (80x25, vt100 emulation)
wsdisplay0: screen 4 added (80x25, vt100 emulation)