68010 (was Re: Mac IIci)

From: Sean 'Captain Napalm' Conner <spc_at_conman.org>
Date: Mon Jan 14 17:03:02 2002

It was thus said that the Great Richard Erlacher once stated:
>
> I do believe the main reason for the 68010's appearance in what was previously
> a number of 68000 applications was that it could support virtual memory, while
> that was awkward on a 68K.

  That is correct. The 68000 could not restart a faulted instruction since
not enough information was saved. The 68010 saved more of the internal
state of the CPU to restart the faulting instruction (and I think the saved
program counter changed too---mostly from past the faulting instruction to
the actual faulting instruction).

  -spc (And they did speed up certain operations on the 68010)
Received on Mon Jan 14 2002 - 17:03:02 GMT