[Coco] C compiler source code

[John R. Hogerhuis]

On Sun, 2005-03-13 at 21:56 -0500, James Dessart wrote:

> On 12-Mar-05, at 1:11 PM, John R. Hogerhuis wrote:

> 

> > One way or another, the OS-9 C compiler is in 6809 ML, so you're going

> > to have to emulate. Seems like a reasonably short project to add a MESS

> > feature such that you can pass an OS-9 command line through the MESS

> > command line.

> >

> > The only unknown for me, I think, is having MESS bring up the emulated

> > machine at the OS-9 prompt rather than going through the whole boot

> > process (booting would be slow). Can MESS do this?

> 

> The answer is here:

> 

> http://www.roug.org/soren/6809/

> 


Link is no workey.


> This emulates the 6809 and OS-9 Level 1. It seems pretty trivial to 

> bring support up to Level 2, or even NitrOS-9, since it only offers a 

> thin abstraction layer over the host system. I've been able to compile 

> it on my Mac, and it runs quite nicely, except for some gotchas here 

> and there. Mainly Level 2 calls that aren't implemented.

> 

> The system is well thought out, and easy to extend (if you do the C++ 

> thing).

> 


I guess my point was, why use a one-off emulator for  OS-9 + Level 1
when you can run NitrOS-9 under MESS? MESS has the wider audience, so
presumably it will get more dev attention, have less bugs, etc.

I think if you can expose a shell prompt through a virtual serial port,
that would get you access to the OS-9 shell.

The only other thing is bringing up the OS-9 "ram image" up in the
middle of the session rather than going through virtual boot-up. 

-- John.