A82: Re: Interrupt speed

To: assembly-82 <assembly-82@lists.ticalc.org>
Subject: A82: Re: Interrupt speed
From: Dines Christy Justesen <c958362@student.dtu.dk>
Date: Tue, 9 Jun 1998 23:11:53 +0200 (METDST)
Delivered-To: assembly-82-outgoing@towerguard.unix.edu.sollentuna.se
Reply-To: assembly-82@lists.ticalc.org


>Does anyone know the correct interrupt speed for the TI-82?

>
[CUT]

>
>This suggests a period of about 62000 T-states on fresh batteries.
>Another interesting thing is that the period gets lower when the CPU runs
slower. The blink rate of the cursor is probably constant no matter how
bad batteries the calculator have.
>
>If the calculator runs at 6 MHz and the interrupt period is 62500 there
are 96 interrupts each second, which might be the magic value for fresh
batteries - or?


The speed of the calc on fresh batteries is not the same for all calcs.
The calc uses a resistor and a capacitor to make the frequency, and since
the value of these components is not exactly the same in all calcs neither
is the frequency. Besides that you can not be sure that all batteries will
give the same frequency. 

Dines

_______________________________________

Dines Justesen
Email: dines@post1.com or
       c958362@student.dtu.dk
WWW  : http://www.gbar.dtu.dk/~c958362/
_______________________________________

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