6502/Z80 speed comparison (was MITS 2SIO serial chip?)

From: Richard Erlacher <edick_at_idcomm.com>
Date: Fri Dec 21 17:53:14 2001

We went through all this a couple of years back under the same heading. If the
Z235980 at 234 THz is code compatible then, if I understand you correctly, it IS
a Z80, right? Even though the Z180 won't fit in a Z80 socket, you'd sell it as
a Z80 anyway, right? Even though it didn't even exist back when it mattered,
you still insist it's a Z80, right?

My Pentium executes the Z80 code just fine at about 75x the speed of of a Z80.
Does that mean it's a Z-80?

We're comparing CHIPS, not philosophical constructs. If it IS a Z80, or Mostek
3480, or something else EXACTLY a Z80, i.e. built under the license,
pin-compatible, code-compatible, etc. then MAYBE it's germane to this
discussion. No chip that isn't a pin-compatible substitute commonly referred to
as a Z80 back in the days when the Z80 mattered is germane to this topic. If it
won't plug into the socket of a Z80, FORGET IT, because it's not a Z80. If
that's too difficult for you, then please ask an adult why a 47-ohm resistor
isn't the same thing as a 75-ohm resistor.

I'm sure glad you're not trying to sell parts any more, Allison. I'd hate to
have to argue with you that the choke you're trying to pitch isn't a diode.

Dick

----- Original Message -----
From: "ajp166" <ajp166_at_bellatlantic.net>
To: <classiccmp_at_classiccmp.org>
Sent: Friday, December 21, 2001 4:24 PM
Subject: Re: 6502/Z80 speed comparison (was MITS 2SIO serial chip?)


> From: Richard Erlacher <edick_at_idcomm.com>
>
>
> >There are lots of things that you could compare, but the first things
> you've got
> >to leave out are the ones that aren't a Z80, which immediately deletes
> the Z180,
> >and Z280. The Z80 is not around any more than the 6502 is around.
> There are
>
>
> Why? they are still z80 core and code compatable. While they add things
> like
> serial IO, timers and MMU they are Z80, maybe more so than 65C02.
>
> Allison
>
>
>
Received on Fri Dec 21 2001 - 17:53:14 GMT

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