[Coco] NitrOS-9 ROM Pak ?
operator at coco3.com
Sun Mar 29 23:12:43 EDT 2009
At 08:02 PM 3/29/2009, you wrote:
>On 3/29/09, Roger Taylor wrote:
> > I thought Boisy's FAQ talks about using a 16K ROM (for a CoCo 1/2?).
> > What about a 32K ROM. I've never burned any to see if they map in at
> > $8000 or $C000 in two banks. If they map in at $8000, it's the same
> > exact thing as desoldering the CoCo 3 BASIC ROM set chip if you can
> > just map the ROM in right or copy it down into the underlying RAM.
>The CoCo 1 and 2 don't have a 32K External ROM mode like the CoCo 3.
That's correct. Anyway, maybe just enough can fit in 16K to boot up
NitrOS-9 Level Two and have a script load the rest from somewhere else.
>To get 32K ROM in a cartridge on those machines you need some extra
>hardware in the cartridge, either to employ a banking scheme or to do
>your own address decoding and utilize SLENB* to prevent the internal
>ROMS from being selected.
More information about the Coco