[Coco] NitrOS-9 ROM Pak ?

[Roger Taylor]

At 03:51 PM 3/29/2009, you wrote:

>Roger,

>Here is a specific example. Take a normal DOS1.1 ROM and change two 

>bytes at $C0E5 and $C0E6 to $DF02. When that ROM starts, it will 

>immediately issue the DOS command and boot OS-9 from a floppy.

>

>You can test this with a Coco3 by turning on the unit and issuing 

>the following:

>POKE&HC0E5,&HDF

>POKE&HC0E6,&H02

>EXEC&HC002

>

>You were probably thinking of having the kernel in the DOS ROM. With 

>a Coco3, the SEB will patch the RAM image of the ROM and most likely 

>trash the kernel.




I made some auto-booting patches back in the early 90's.  I'm not 
asking how to do DOS tricks.  I'm wanting to boot a minimum NitrOS-9 
system (or even OS-9 Level Two 6809) from a ROM Pak and it can fetch 
everything else it needs from the disk in DRIVE 0.  If it can't find 
the stuff, there should be enough to still access /D0 and a 
communications port to get the system rolling later.

Nothing about Disk BASIC should be needed since /D0 wouldn't be 
accessed until OS-9 finishes booting, at which point the OS-9 floppy 
system is in use.

-- 
Roger Taylor

http://www.wordofthedayonline.com