On 13/02/2007, at 12:09 AM, Brian Foley wrote:
On Mon, Feb 12, 2007 at 11:00:34PM +1100, Huw Davies
wrote:
The "bad" news is that a VAX-11/780 has a 500KHz clock (I had to
check I didn't write 500MHz there :-)
Err... are you sure you don't mean 5 MHz? I know it was 1977 and they
chiseled ICs directly out of raw basalt back then, but even still! :)
http://www.netbsd.org/Documentation/Hardware/Machines/DEC/vax/
vax700.html#vax700:vax_11_780
The early VAXes took quite a few clock cycles to execute each
instruction,
and the 11/780 could execute about 500,000 instructions/sec.
Perhaps this
is where you're getting your figure from?
More than happy to stand corrected - yes, I recalled the 500K
instructions/second and mapped that to a 500KHz clock.
Huw Davies | e-mail: Huw.Davies at kerberos.davies.net.au
Melbourne | "If soccer was meant to be played in the
Australia | air, the sky would be painted green"