Offloading instruction sequences in in a lot of processors as a good idea that the design team put in silicon for future expansion but rarely used. I have only seen it actually used in a couple of 8 bit processors (Both 8051 based) It is in the silicon of
a couple more 8 implementations with no way to use the feature without custom bondout.

w..


"Alan B. Pearce" wrote:
>
> >Gads, you mean there is someone besides me who even REMEMBERS the 8089?
>
> Yeah, but never used one. Was always intrigued with the concept of
> offloading to a co-processor (as distinct from an FPU).
>
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