[Oberon] Volatile variables in Oberon

[Chris Burrows]

> -----Original Message-----
> From: Skulski, Wojciech [mailto:skulski at pas.rochester.edu]
> Sent: Saturday, 30 July 2016 12:27 PM
> To: chris at cfbsoftware.com; ETH Oberon and related systems
> Subject: RE: [Oberon] Volatile variables in Oberon
> 
> Chris wrote:
> > I cannot think of a situation where you would need to specify that
> a
> > variable is volatile when using Oberon-07. Can you think of one?
> 
> Yes I can. If a variable is mapped to a register which can be changed
> "from the other end" then it is volatile.
> 

But Oberon variables are not mapped to registers that can be changed "from
the other end". The explicit operations SYSTEM.GET and SYSTEM.PUT are used
when you want to transfer data between a peripheral register (mapped to an
absolute memory location) and Oberon variables.  

Regards,
Chris Burrows

CFB Software
http://www.cfbsoftware.com