RamFast Error code

[Rich Hare <Rich113JL@gmail.com>]

I've got a IIGS Rom 03 with a RamFast in it that has been working great 
for a couple of years.  Recently I've been adding hard drives and moving 
stuff around and suddenly I'm having problems.  I'm pretty sure I'm 
observing all SCSI protocol; the RamFast provides Term Power, all drives 
have unique ID's and I have a big 50 pin terminator at the physical end 
of the chain.  I've got a Kensington switch thingie and fan on the top 
of the GS, which is in a relatively cool basement.

Sometimes the problem manifests itself when I'm copying files with a 
GSOS message "GSOS is unable to complete this process" and the drive in 
question will not pass a validation test.

Recently (usually when copying files) I've suddenly had a blue screen 
with strange text on it; when I do a three finger salute I get a 
message: "RamFast SCSI Fatal Memory Fault Code: 0D"  (That's Zero Delta)

Cannot find RamFast fault codes in the FAQ's.

Anybody know what this is, or suggest an investigative approach?

Rich