Teaching kids about computers...
cclist at sydex.com
Thu Nov 29 17:25:10 CST 2007
On 29 Nov 2007 at 16:11, Jules Richardson wrote:
>  Google seems to suggest 1979 - perhaps too late (or back then, too
> expensive) for use over the 6502...
1979 sounds right to me. I recall a BYTE magazine interview with the
design team. One topic was the low clock speed (initially 1 MHz).
The response from one of the team members was something to the effect
"if we would have known that people would rate CPUs by their clock
speed, we would have put a waveguide on the 6809". I believe that
the 6809 actually has *fewer* instructions in its set than the 6800
(depending on what one calls an instruction), which was something
very unusual at the time.
But the 6809 was an evolutionary dead-end. It came out too late, and
while it turned in very respectable performance, it was hampered by
lousy product timing--the 68K debuted in the same year and was in a
different category altogether.
I recall seeing the 6809 datasheet and looking for information at the
1979 Wescon (IIRC) and coming home with a pile of 68K literature and
forgetting about the 6809 entirely.
It's ironic in a way--6800-family products are still made, as are 68K
products. But the 6809 is forgotten. Apparently, there's a VHDL
implementation for those amenable to FPGA versions.
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