Back in the 90's, this used to be a firewall machine at work. To get two Phobos G100 100BaseT cards to work, we were advised by Phobos to replace the Mezzanine card with an Indy Graphics card. The Graphics card has no output as far as I can tell, and in any case, there is no provision for keyboard, mouse, or sound on a Challenge S.
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# hinv -vm
CPU: MIPS R5000 Processor Chip Revision: 1.0
FPU: MIPS R5000 Floating Point Coprocessor Revision: 1.0
1 150 MHZ IP22 Processor
Main memory size: 256 Mbytes
Instruction cache size: 32 Kbytes
Data cache size: 32 Kbytes
Integral SCSI controller 0: Version WD33C93B, revision D
Disk drive: unit 1 on SCSI controller 0
On-board serial ports: 2
On-board bi-directional parallel port
Graphics board: Indy 8-bit
Integral Ethernet: ec0, version 1
Integral ISDN: Basic Rate Interface unit 0, revision 1.0
# /usr/gfx/gfxinfo
Graphics board 0 is "NG1" graphics.
Managed (":0.0") 1024x768
8 bitplanes, NG1 revision 6, REX3 revision B, VC2 revision A
MC revision C, xmap9 revision A, cmap revision C, bt445 revision D
Display 1024x768 @ 60Hz, monitor id 15
# ifconfig -a
sfe0: flags=c63<UP,BROADCAST,NOTRAILERS,RUNNING,FILTMULTI,MULTICAST>
sfe1: flags=822<BROADCAST,NOTRAILERS,MULTICAST>
ec0: flags=802<BROADCAST,MULTICAST>
lo0: flags=1849<UP,LOOPBACK,RUNNING,MULTICAST,CKSUM>
inet 127.0.0.1 netmask 0xff000000
# uname -a
IRIX kiyone 6.5 05190003 IP22