Isaac Marino Bavaresco wrote:
>
>
> But it is possible to use the external memory as a
> slightly-slower-than-internal-memory mass storage device, by using table
> read and write instructions.
>
> Indeed, this configuration is much like the XDATA of 8051 devices.
>
>
> Regards,
>
> Isaac
>   
That's what was in my mind due to Matt chatting earlier about external 
RAM and also the post about wanting the 315k Byte approx data buffer.
As Olin points  out the internal registers entirely use up the 12bit / 
4096byte "f" addressing mode of instructions

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