See comments.
who% /usr/sbin/prtdiag
System Configuration: Sun Microsystems sun4u Sun Blade 150 (UltraSPARC-IIe 650MHz)
System clock frequency: 93 MHZ
Memory size: 1.75GB

==================================== CPUs ====================================
               E$ CPU CPU
CPU Freq Size Implementation Mask Status Location
--- -------- ---------- --------------------- ----- ------ --------
0 650 MHz 512KB SUNW,UltraSPARC-IIe 3.3 on-line +-board/cpu0

================================= IO Devices =================================
Bus Freq Slot + Name +
Type MHz Status Path Model
------ ---- ---------- ---------------------------- --------------------
pci 33 +s/system-board isa/isadma (dma)
              okay /pci@1f,0/isa@7/dma

pci 33 +s/system-board isa/su (serial)
              okay /pci@1f,0/isa@7/serial

pci 33 +s/system-board isa/su (serial)
              okay /pci@1f,0/isa@7/serial

pci 33 +s/system-board pci108e,1101 (network) SUNW,pci-eri
              okay /pci@1f,0/network@c,1

pci 33 +s/system-board pciclass,0c0010 (firewire)
              okay /pci@1f,0/firewire@c,2

pci 33 +s/system-board pci10b9,5451 (sound)
              okay /pci@1f,0/sound@8

pci 33 +s/system-board pci10b9,5229 (ide)
              okay /pci@1f,0/ide@d

pci 33 +s/system-board SUNW,m64B (display) ATY,RageXL
              okay /pci@1f,0/SUNW,m64B@13


============================ Memory Configuration ============================
Segment Table:
-----------------------------------------------------------------------
Base Address Size Interleave Factor Contains
-----------------------------------------------------------------------
0x0 256MB 1 chassis/system-board/DIMM0
0x40000000 512MB 1 chassis/system-board/DIMM1
0x80000000 512MB 1 chassis/system-board/DIMM2
0xc0000000 512MB 1 chassis/system-board/DIMM3

=============================== usb Devices ===============================

Name Port#
------------ -----
hub 1
keyboard 2
mouse 4
who%