Date   : Thu, 03 Dec 2009 21:47:47 +0000
From   : jgh@... (Jonathan Graham Harston)
Subject: Tube - I/O processor memory questions

John Kortink wrote:
> >http://beebwiki.jonripley.com/Reading_command_line
> 
> Um, OSWORD 5 does not auto-increment the address ...
> If you do a quick scribble in a Wiki, better check it first.
 
I was trying to do it with a Blackberry during a very boring
meeting, and was having trouble with the cut&paste. Fixed now.
 
John Kortink wrote:
> >It's in the various Tube documentation. On Soft Break the last CAO
> >(Currently Active Object - code with an image header, the same as a
> >ROM header) will be re-entered.
> 
> That's nonsense. A language doesn't need to have
> a ROM header. If it has one, it is validated, but
> that is all.
 
No, if entered code has a header, it becomes (in modern parlance)
the Currently Active Object, and is re-entered on Break, and can
only be exited by entering something else. If the entered code does
not have a header, then is does not become the CAO, it is entered
as transient code, and is exitable from with RTS.
 
-- 
J.G.Harston - jgh@...                - mdfs.net/User/JGH
Whitby Yards Gazetteer - http://mdfs.net/Docs/Books/YofWhitby/Gazetteer