[BBC-Micro] A500 development ROMs

[Jonathan Graham Harston]

> Message-ID: <49008071.6040403 at gmail.com>
 
Jules Richardson wrote:
> Jonathan Graham Harston wrote:
> > Has anybody every come across the A500 development ROMs? Every time
> 
> Hmm, were they originally Brazil in ROM, or did they run something
> else?
 
I'm not sure. I though Brazil was what the PC Springboard used, and
so communicated via the PCI bus with the PC. That's what the files
in <http://mdfs.net/Mirror/Archive/Acorn/Spring.zip> suggest. The
A500 communicated through a Tube link with a BBC/Master.
 
Mike Tomlinson wrote:
> Do you mean Arthur, the predecessor of RISC OS?  IIRC, it was written in
> Basic.
 
How does one write an operating system in Basic?
 
0 GOTO branch_zero
4 GOTO abort_hander
8 GOTO swi_handler
 
?
 
I have a copy of Arthur, the first //Archimedes// operating system,
at <http://mdfs.net/System/Rom/AcornMOS/Archimedes>
 
-- 
J.G.Harston - jgh at arcade.demon.co.uk - mdfs.net/User/JGH
05:10:36, 18-Nov-2008 - RISC OS time rolls over to &5000000000