Re: TI-H: Speed on a TI-83

To: ti-hardware@lists.ticalc.org
Subject: Re: TI-H: Speed on a TI-83
From: Bryan Fields <kb9mci@urbancom.net>
Date: Thu, 06 Apr 2000 20:34:10 -0500
References: <4f.24dc0b5.261e887b@aol.com>
Reply-To: ti-hardware@lists.ticalc.org

i don't want to change the voltage i am just pointing out that it does
change over the life of the batts.  thus changing the time it takes to
charge that cap.  so over the batt. life your calc will slow down. 

if you would replace the r/c timer with a vxo (variable freq. x-tal
oscillator) your calc would stay at the same speed no matter what the
voltage applied to it.  the cap placed across the x-tal would allow you
to very the freq. of the oscillator over 50 kc or so.  i don't know if
50 kc would do much to the calc speed though.

RoniBarrett@aol.com wrote:
> 
> In a message dated 4/6/00 6:43:42 PM Eastern Daylight Time,
> kb9mci@urbancom.net writes:
> 
> << would it be possible to put a VXO in place of the present oscillator so
>  the clock speed would be adjustable and stable over the operating
>  voltage range of the calc. >>
> Dont the Z80 calcs all use a capacitor for clock time? I know to overclock
> them, you use just lower the capacitance, rather than changing the voltage,
> like in most processors.

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And just 'cus I am a Pyro,

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--Bart Simpson

Bryan Fields, KB9MCI

References:

Re: TI-H: Speed on a TI-83

From: RoniBarrett@aol.com