Re: The Apple ][ was cool!

[russotto@user138.dsli.com (Matthew Russotto)]

In article <1ewtsc5.rkqb7i1yqisg0N%dempson@actrix.gen.nz>,
David Empson <dempson@actrix.gen.nz> wrote:
>william strutts <wrstrutts1@nospam.home.com> wrote:
>
>The 68HC11 is not derived from the 6809.  It is actually an extended
>6801.  It is also strictly an 8-bit processor with 64K address space and
>some 16-bit capabilities.  (Some models may have bank switching features
>to extend the address space.)  You might be thinking of the 68HC16,
>which is a 16-bit processor derived from the 68HC11.
>
[...]
>
>The 68HC11 family adds more features to the 6801: a Y index register,
>even more instructions, and a much wider variety of peripherals.  The
>instruction set is a superset of the 6801.
>
>The 6809 is a side branch from the 6801, which is a significant
>functional improvement but losing machine code compatibility.  The 68000
>is the logical successor of the 6809.

It may be the logical successor, but it's not a direct successor by
any means; it's a whole new architecture.

IIRC, the 68HC11 is one of the more popular microcontrollers still.


-- 
Matthew T. Russotto                                russotto@pond.com
"Extremism in defense of liberty is no vice, and moderation in pursuit
of justice is no virtue." 
=====
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