[rescue] HAL computer systems SL/100R

[Full_Name]

Hi,
   I have recently acquired a pair of HAL computer systems SL/100R.  These 
are 19" rack mounted units using a Sun AXi motherboard and (AFAIK) a Sun 
UltraSPARC IIi 333mhz processor, 9Gb SCSI HD, SCSI CD-ROM, floppy and PCI 
quad ethernet card and ATI Rage graphics card via some bizaar header (as 
far as I can tell the header is just so the cards can be fitted parallel to 
the motherboard).  Since I got them the power supply on one of them appears 
to have died; when the machine is plugged in and the power button is held 
down, nothing happens but it works when connected to the other machine's 
power supply.  My questions are numerous and varied:

1. If it possible to repair / replace the power supply- are there any likely 
easy fixes?
2. Is it possible to acquire more RAM (currently each has 256mb in two of 
eight DIMM slots) the motherboard manual says it will support up to 1gb 
(with 256 & 512 mb DIMMs is it possible to go higher?) and requires 60ns 
168pin EDO ECC DRAM DIMMs
3. Is it possible to run Solaris 8/9 or UltraLinux on them?  The SPARC port 
of Debian can allegidly be run on a SPARC64 but is the lack of a bootable 
floppy drive a problem?
4. Are there any "Linux on a floppy" distro's that will work on them to see 
how much of the hardware works, etc.
5. Given that www.hal.com is long gone and Fujitsu claim to have not even 
heard of HAL is there anywhere I can get (more) documentation for these?

Thanks in advance,
 ~ Martin