[Coco] CoCo 3 I/O map

Arthur Flexser flexser at fiu.edu
Tue Mar 4 02:32:00 EST 2014


On Mon, Mar 3, 2014 at 11:24 PM, William Astle <lost at l-w.ca> wrote:

> A couple of notes for the GIME registers:
>
> Also, a note on the interrupt vectors (FFFx): On the coco1 and coco2, the
> contents of those vectors comes from the color basic ROM at BFFx. On the
> Coco3, however, the contents of those vectors comes from the top 16 bytes
> of the 32K internal ROM (there is much information that states otherwise,
> but I have demonstrated this experimentally). In both cases, they are
> hard-mapped to ROM and cannot be changed regardless of any mode settings.
>
>
Since the CoCo 3 HAS no Color Basic ROM, apart from Color Basic's
representation as the top 8K of the 32K internal ROM, doesn't it amount to
the same thing?

Art



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