[Coco] MESSUI 0.154 with Becker port

[Guillaume Major]

> There is essentially no support for the Coco in MESS at this time. The 
> only way to optimize MESS for the Coco is to compile it yourself and make 
> source code changes as desired.

That's sad...

> If you look at src/emu/bus/coco/cococart.c you will find that the default 
> device is pak. I changed that to fdcv11. That should retain floppies with 
> a cart mounted.
>

Good! Thanks for the tip.

>
> The slot device function is one of several that don't work correctly. You 
> can try previous versions of MESS, working backwards until you find one 
> where ORC-90 works. However, then you won't have Drivewire functionality.
>

Also, CocoMax doesn't work properly anymore since MAME and MESS merged. I 
reverted back to version 0.136, which I think is the most stable version for 
the Coco, where everything used to work like it should.

Guillaume