[rescue] sparc10 cpu - what to do.

[Liam Proven]

On 16 December 2016 at 18:42, Dave McGuire <mcguire at neurotica.com> wrote:
>   The 80486 is little more than an 80386 with an 80387 on-chip.  There
> are other differences, but that's the main one.


No, hang on, that is not accurate or fair.

The 386 is a simple, scalar 32-bit CPU.

The 486 is pipelined -- it delivered roughly twice the
instructions-per-clock of the 80386 -- as well as having on-board L1
cache.

It was a lot more than a 386+387 on the same die, although the ISA was
near identical.

The original P5 Pentium is superscalar -- it has 2 instruction
pipelines and can sometimes do >1 IPC. It has branch prediction and
speculative execution. And with clever coding and instruction
sequencing, as id Software's John Carmack discovered, you can overlap
integer and FPU instructions on the P5 and get a sustained 2
instructions per clock /above/ the normal speed.

The Pentium Pro has instruction decomposition and reordering.

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