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'[Fwd: Message not deliverable]'
1997\03\09@014540 by mail12706

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Subject: Message not deliverable
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Meyer's Patent really has nothing to do with the gas, since it is not
Brown's Gas.  Try Brown's patents.  In addition, the method of
accelerating Brown's Gas output is outlined in the Puharich patent NOT
the Meyer patent, nor any of the Meyer patents. Actually, Meyer
highlights the wrong principles, sorry.


'[Fwd: Message not deliverable]'
1997\04\01@022351 by e
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Subject: Message not deliverable
Date: Tue, 25 Mar 1997 03:44:24 -0700
From: @spam@Hub.AdminKILLspamspamccmail.microchip.com (Administrator)
To: Stefan Ranguelov <KILLspamrangueloKILLspamspaminformatik.hu-berlin.de>

Antonio Almeida wrote:
>
>         Are there any SPI RAMs width some Kbytes ? If not, is any
> "friendly" way to use normal RAMs width the PIC (i mean, using not to much
> pins) ?
>

I red an article about DALLAS DS 1380/1381. It have 2k x 8bit.
It have two 8 bit Ports and 2 control lines. Over the first port
the PIC can supply Adress/Data. In a 'transparent' mode the 8
lines of the PIC can be switched through to the second port an
can be used as normal port pins. So you effective need two
pins on the PIC for the control signals.

I don't have any price information on this chip.

St.

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     |                                       |||||||||||||      |
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1997\04\01@070930 by Byron A Jeff

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> Antonio Almeida wrote:
> >
> >         Are there any SPI RAMs width some Kbytes ? If not, is any
> > "friendly" way to use normal RAMs width the PIC (i mean, using not to much
> > pins) ?
> >
>
> I red an article about DALLAS DS 1380/1381. It have 2k x 8bit.
> It have two 8 bit Ports and 2 control lines. Over the first port
> the PIC can supply Adress/Data. In a 'transparent' mode the 8
> lines of the PIC can be switched through to the second port an
> can be used as normal port pins. So you effective need two
> pins on the PIC for the control signals.

A very accurate description. A couple of more observations:

1) It takes three data moves to transfer data to/from the RAM
2) The 1380/81 IO pins doesn't have the same load capacity as the PICs
3) the 81 is battery backed internally. The 1380 has pins for adding a
backup battery.
4) Data sheets are available from the Dallas Semi website.

>
> I don't have any price information on this chip.

You can buy in ones/twos directly from DallasSemi. Last I checked the
1380 was in the $9 ballpark while the 1381 was $11 or so.

BAJ

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