Arty computers

[Gordon JC Pearce]

Dave McGuire wrote:
> On Feb 1, 2007, at 12:26 PM, woodelf wrote:
>>> The old GE machines with the "Thousands of Operations Per Second" 
>>> analogue meters were kind of neat too.
>> So just how does one construct such a meter?
> 
>   Have the logic generate a pulse at the beginning (or end) of each 
> instruction cycle, buffer it, feed it into an integrator, and then into 
> an analog meter.  Easy as pie.

Not as simple as that - you'd just have an analogue frequency meter 
showing the instruction rate.

If you wanted it to show how busy the machine is, something in the idle 
loop toggle the bit that drives the integrator.  Set the bit high when 
you come out of the idle loop, set it low when you go in...

Gordon.