[Coco] DECB DOS Command

[Arthur Flexser]

But, wouldn't it have been simpler to just have that application set up
its own warm start address, in place of having to set up the SWI3 vector
with that address?  Where's the gain in using SWI3?

Art

On Sat, 13 Dec 2003, John E. Malmberg wrote:

> tim lindner wrote:
> > I was just reading the Disk BASIC unravelled book and came away with the
> > following question:
> > 
> > Why does the 'DOS' command first issue a SWI3 instruction?
> > 
> > Disk BASIC sets up the SWI3 vector to do nothing. It just returns to the
> > caller. 
> 
> Well I do not know what it was intended for, but when I know of several 
> things that it could be used for.
> 
> While it may be difficult to get ROM BASIC to work under OS-9, it is 
> relatively trivial to get it to work under FLEX+.
> 
> The major issue when doing that is that to exit back to FLEX, you had to 
> EXEC back to the right location.  The DOS command would allow a warm start.
> 
> So this feature can be very useful, if you want to use the DOS command 
> to load something other than OS-9 that can run DECB, and wants to do a 
> warm start.
> 
> -John
> wb8tyw at qsl.network
> Personal Opinion Only
> 
> 
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