[Oberon] RISC5; was Embedded Project Oberon on a breadboard

[peter at easthope.ca]

From:	Chris Burrows <chris at cfbsoftware.com>, Sat, 10 Sep 2016 14:54:09 +0930
> ... ported the Astrobe Embedded Project Oberon RISC5 system ...

Sorry for a trivial question but I wonder about an acceptable 
statement of the meaning of RISC5.  
"RISC5, the CPU of Project Oberon 2013, implemented in a FPGA." 
What is the significance of "5"?

A glossary section in https://en.wikipedia.org/wiki/Oberon_(operating_system)
could be helpful.  RISC is mentioned under History but RISC5 
could be in a glossary.  Comments?

Thanks,                     ... Lyall E.
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