[Coco] NitrOS-9 ROM Pak ?
operator at coco3.com
Sun Mar 29 20:35:49 EDT 2009
At 03:51 PM 3/29/2009, you wrote:
>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
>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.
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