hardware multiply/divide functionality in CPUs

Jules Richardson jules.richardson99 at gmail.com
Mon Mar 7 17:52:49 CST 2011


Richard wrote:
> In article <4D7554BF.5090201 at gmail.com>,
>     Jules Richardson <jules.richardson99 at gmail.com> writes:
> 
>> ... or mid-late '70s and early '80s CPUs, to be more specific. Can anyone 
>> furnish me with a better knowledge as to which processors of that kind of time
>> period had hardware multiplication and division support?
> 
> Integer or floating-point?

Ahh, integer only - I'm not too worried about FP operations.

> x86 had hardware floating-point divide/multiply fairly early with the
> 80x87 FPU chips (8087, 80287, 80387, 80487, then 486DX2 had the FPU on
> the CPU, IIRC).

True. I think the 486DX (minus the 2) had the FP ops built in (did the 
386DX??) If I remember right a few manufacturers made math chips for the x86 line.

> The 68K line of processors also had companion FPU chips until they got
> an FPU implemented on-chip.

I always forget how darn *old* the humble 68k is :-)

cheers

Jules



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