Speed meters, was Re: Arty computers

Dave McGuire mcguire at neurotica.com
Sat Feb 3 10:53:40 CST 2007

On Feb 3, 2007, at 12:52 AM, Scott Quinn wrote:
>>> The nerds would then hack these to say 99 MHz.
>>> The ubernerds would hack them to say 1111 MHz...
>> ...and "who cares" dummies like yours truly would simply hack them to
>> say "HI" and "LO"...
> I surely can't be the only one to have thought of hex...

   Nope...I know three or four people who did that.

> Anyone hacked their Z-80 with a analog meter yet? Seems the easiest  
> (just pull off of the M1 line).

   That'd give you a fairly constant reading...not very exciting.   
Not many Z80 systems have variable clock rates.  Though building one  
wouldn't be difficult.

   I had an interesting thought while considering the analog meter on  
the Z80 idea.  I do some Forth hacking on Z80s.  It'd be pretty easy  
to hack in a couple of instructions to pulse an output line at the  
beginning of the routine that executes a Forth word.  That'd give you  
an analog display of the word execution rate.  Since different words  
require different amounts of time to execute, it might actually give  
you some sort of meaningful display.


Dave McGuire
Port Charlotte, FL

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