29 Jan
2010
29 Jan
'10
4:14 a.m.
Ben wrote:
Geoffrey Reed wrote:
Well if remember right a 2 MHZ 6809 with Memory Managment Unit
could run 2 to 5 users under OS/9 level two at modest serial
baud rates.( 300 to 1200 baud ) That to me is a full system. I
consider a 6809, 1/3 a PDP 11 in computing power as a ballpark.
Ben.
I've run a 6809 and programmed it. Nice chip. Lots of PDP-11 like
similarities
but speed wise it was more like 1/3 an LSI-11 which was about the slowest
of the PDP11s. Compared to an 11/23 or worse 11/34 it was far slower.
The T11 (8bit access mode) and the 6809 without MMU were on par with
each other only because the bus bandwidth in 8bit mode slower.
Since I've played with both chips T11 and 6809 I will say the 6809 is
one of
the easier CPUs to build around and has a far more balanced and powerful
instruction set and addressing modes than anything Intel.
For those wanting to build aa SBC with this chip look at Dave Dunfields
CUBIX.
Allison
Thanks
for the suggestion but I was hoping for something actually
had a 6809
chip on it.
There is a IO mezzanine board in the works that will make the 6809 board
more of a full system.