RE: uIEC/SD in 3v3

From: Didier Derny <*didier_at_aida.org*> Date: Sat, 24 Dec 2011 00:14:38 +0100 Message-ID: <000501ccc1c8$a486cf20$ed946d60$@org> · didier_at_aida.org

Hi Jim,

The signal will be 3v3 too
It will come from my avr 128 A1 xplained.

I'll develop the interface with an arduino a 5v
Then I'll port the system in 3v3 with the avr xplained.
[to avoid mixing 2 sources of problem]

Thanks

--
didier

-----Message d'origine-----
De : owner-cbm-hackers@musoftware.de
[mailto:owner-cbm-hackers@musoftware.de] De la part de Jim Brain
Envoyé : samedi 24 décembre 2011 00:08
À : cbm-hackers@musoftware.de
Objet : Re: uIEC/SD in 3v3

On 12/23/2011 3:26 AM, didier derny wrote:
> Hi
>
> I'm thinking to use the uIEC/SD as "floppy" disk for my emulator on avr
> is there any chance to use the uIEC/SD in 3v3  ?
>
> thanks
>
> -- 
> didier
>
>       Message was sent through the cbm-hackers mailing list
Remove the 3V3 regulator and jumper across it.  You'd also need to 
bypass the 3 voltage dividers on the SD lines (the 3300/1800 pairs on 
the bottom, remove the 3300 and short the 1800).  That should take care 
of things, assuming AVR has 5V tolerant inputs when driven at 3V3.

Jim

-- 
Jim Brain
brain@jbrain.com
www.jbrain.com

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