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BS2 with extra memory — Parallax Forums

BS2 with extra memory

BronsonBronson Posts: 44
edited 2005-12-08 12:31 in BASIC Stamp
Hi,

I am doing a simple project related to EEPROM memory storage with my BS2.
I can see that Parallax stop selling X25640.
Since I lived in Jakarta, Indonesia, I couldn't find this XICOR IC.
Does anyone know any alternative solutions beside using I2C EEPROM IC?

Regards,
Bronson

Comments

  • Chris SavageChris Savage Parallax Engineering Posts: 14,406
    edited 2005-12-08 01:58
    Here's a 16K EEPROM...How much storage did you need?

    http://www.parallax.com/detail.asp?product_id=602-00013

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    Chris Savage
    Parallax Tech Support
    csavage@parallax.com
  • BronsonBronson Posts: 44
    edited 2005-12-08 03:27
    Chris,

    Thanks for your prompt reply.
    But 24LC128 is for BS2P or BS2SX, not for BS2.
    If possible, I need some IC like X25640 due to simple connection and I don't have BS2P or BS2SX.
    Do you have any substitution ICs of X25640? 4K capacity is enough.
    Also, if I need to find this info on Web search engine, what is the keyword? SPI serial EEPROM, 2-wires serial EEPROM, or 3-wires serial EEPROM?
    What do '2-wires' and '3-wires' terms refer to? Does it mean I2C connection?

    Regards,
    Bronson
  • ForrestForrest Posts: 1,341
    edited 2005-12-08 04:05
    The 24LC128, 16KB I2C EEPROM that Chris linked to above works just fine with a BS2 - I've used it myself. Nuts and Volts #115 shows you how to connect and access this memory chip with a BS2 www.parallax.com/dl/docs/cols/nv/vol5/col/nv115.pdf
  • Chris SavageChris Savage Parallax Engineering Posts: 14,406
    edited 2005-12-08 04:59
    Yes, in fact, if you look at the docs, example BS2 code is included.· This is why I posted the link.· My question was how much memory did you need?

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    Chris Savage
    Parallax Tech Support
    csavage@parallax.com
  • BronsonBronson Posts: 44
    edited 2005-12-08 08:09
    Oops...
    I thought that 24LC128 only works with BS2PE and BS2SX as stated in
    http://www.parallax.com/detail.asp?product_id=602-00013
    So, what is the difference between SPI serial EEPROM, 2-wires serial EEPROM, and 3-wires serial EEPROM?

    Thanks guys...You are the best.
  • Bruce BatesBruce Bates Posts: 3,045
    edited 2005-12-08 10:40
    Bronson -

    It looks like you are writing your own text here, as this is what the web site actually says for that product:

    "DESCRIPTION: This is the recommended EEPROM when you're implementing an OEM BASIC Stamp 2SX or BASIC Stamp 2P design."

    You introduced the word "only", which never appears in that text.

    As far as the different types of synchronous serial interfaces (SSI), each has it's own inventor/promoter, and proprietary name. Some of the names are SPI (Motorola), Microwire (National), Maxim 3-wire (Maxim/Dallas) and lastly I2C (Philips), where the latter is the most advanced of the protocals. There may be others as well, but those are generally viewed as the most common ones.

    Here is a web page with some more general information on SSI's, and how they're accessed:
    http://www.epanorama.net/links/serialbus.html

    Regards,

    Bruce Bates
  • BeanBean Posts: 8,129
    edited 2005-12-08 12:31
    Bronson,
    The BS2SX and BS2P have I2C commands built in. The BS2 can do I2C but you must code the protocol (which isn't too hard).
    Bean.

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