Hi Jim,
I don't think 12V eprom program has ever been tested. As you notice, it's
hard to find an appropriate adapter.
It looks only like the DS2406, DS2502 and DS2505 need the program pulse
(480usec).
The DS2490 datasheet does say that it supports 12V programming.
http://datasheets.maxim-ic.com/en/ds/DS2490.pdf
Only not in the DS9490 device.
I'll try to add support and get you to test.
Paul Alfille
On 9/21/07, Jim Kusznir <[EMAIL PROTECTED]> wrote:
>
> Hi all:
>
> I've been trying for about a week to write to the DS2406's EPROM using
> OWFS. I realize that the bus master needs to have +12 VPP, and have
> been working on this.
>
> I currently am trying to write using:
>
> echo "test" > memory
>
> from within my owfs chip's directory. I get an error message from echo.
>
> I have two bus masters: DS9490R (USB) and DS9097E ("passive"). The
> 9097E has the connecter for +12, which I've put on it. Unfortunately,
> it looks like OWFS doesn't see it as the E version, but a version
> which does not have +12 which I believe is responsible for it not
> allowing me to write.
>
> I have also opened up one of my 9094R's, lifted the VPP pin and
> applied +12 externally. Unfortunately, I am still unable to write
> through OWFS.
>
> In all my endevors to write so far, the only sucess I've had is to
> bring up my 9097E in windows (on a hardware serial port -- I found usb
> serial adaptors don't work), and writing one nibble at a time (more
> that that fail).
>
> Based on reading the data sheet for the DS2490 (the chip the 9094R is
> based on), it sounds like it may require a register or other setting
> to be set to enable programming. I looked and looked through owfs and
> read every piece of documentation I could find, but could not find any
> information on setting the programming enabled info, or even
> retreaving information on wether programming voltage is detected.
>
> So, my questions:
>
> 1) how do I write to EPROMS requiring the +12VPP?
> 2) What adaptors have others sucessfully used?
> 3) Can I configure an adaptor such as the 9094R as write-enabled after
> I physically modified it to include +12 VPP? Do I need to?
>
> Any other relevent comments?
>
> Thanks!
>
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