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Article #623878Re: What microprocessor is more powerful, the Z80 or 6502?
From: Quadibloc
Date: Mon, 11 Jun 2018 12:38
Date: Mon, 11 Jun 2018 12:38
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On Monday, June 11, 2018 at 2:20:19 AM UTC-6, Andy Leighton wrote: > On Mon, 11 Jun 2018 08:00:27 +0100, Ahem A Rivet's Shot <ste...@eircom.net> wrote: > > The Motorola engineer who came to talk to us about the 6809 and > > actually talked about the 68000, which had come off the company > > confidential list so recently that the documents still had the security > > legends, gave the strong impression that the 6809 was deliberate practice > > for the 68000 which is what they wanted to do but weren't ready for. > I am not so sure about that. The 6809 seems like an outgrowth of the > 6800. Take for example the registers - the 6809 just had A and B (like > the 6800) but could also treat them together as a 16bit register (like > the Z80's BC,DE,HL), whereas the 68K had 8 32bit general purpose > registers. That's a big difference in design philosophy. That's definitely true - the 6809 was an improved 6800. But since it did have a hardware multiply, designing it did still give some experience relevant to making the 68000, I would think. John Savard
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