Path: utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!tut.cis.ohio-state.edu!pt.cs.cmu.edu!andrew.cmu.edu!jm7e+ From: jm7e+@andrew.cmu.edu (Jeremy G. Mereness) Newsgroups: comp.sys.apple Subject: 68000 vs. 65816 Message-ID: Date: 12 Feb 90 21:15:27 GMT References: <16555.apple.net@pro-sol> Organization: Mechanical Engineering, Carnegie Mellon, Pittsburgh, PA Lines: 40 In-Reply-To: <16555.apple.net@pro-sol> ruzun@pro-sol.cts.com (Roger Uzun) writes: > In-Reply-To: message from rnf@shumv1.uucp > > As a general rule I would say that the 65816 will compute at 1/4th to 1/3rd > times the speed of the same clocked 68030. > -Roger Alright, alright. Enough of this. I would like some real hardware gurus out there settle this once and for all. This whole thing started with the rumor of 20 MHz 65816's coming out. Anyway, the 68000 series is fast at some things, esp. multiplication and division, but NOT at memory movement. Most 68000 instructions take many more clock cycles than the 65816. Finally, as a 32-bit chip, lousy coding would make the thing have to move long words to read an address. Now, of course, there are MMU's (memory management units) built into 68020's and above, and typically they are coupled with 68881 math co-processors which gravely screw the performance scores. So, let's have a fair and objective comparison of the two platforms, their strengths and weaknesses, and what can and is done to circumvent the latter. And remember, different strengths may only manifest themselves in certain applications! A machine that flies through a benchmark may still be a slug for typical user operations!!!!! Then again, why does it take a 2 meg mac 15 disk swaps to copy a floppy? Apple // forever dammit! ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ |Jeremy Mereness | Support | Ye Olde Disclaimer: | |jm7e+@andrew.cmu.edu (internet) | Free | The above represent my| |r746jm7e@cmccvb (Vax... bitnet) | Software | opinions, alone. | |staff/student@Carnegie Mellon U. | | Ya Gotta Love It. | ---------------------------------------------------------------------------