Reading data from RAM

Discussion in 'General Electronics Chat' started by Dritech, Aug 27, 2016.

  1. Dritech

    Thread Starter Well-Known Member

    Sep 21, 2011
    761
    5
    Hi all,

    I have several X24C44P NOVRAMs which I would like to read data from and rewrite data.
    Is it possible to achieve this or do I have to know how the data was written and what equipment is needed?
    Does anyone know of any tutorial that I can use to achieve this, since I have no experience with RAM ICs?

    Any kind of help would be highly appreciated.
     
  2. BR-549

    Distinguished Member

    Sep 22, 2013
    3,061
    743
    I would start with a data sheet.
     
  3. absf

    Senior Member

    Dec 29, 2010
    1,664
    445
    Here's the datasheet...

    It says that the chip is obsolete. With only 256 bits arranged in 16x16 matrix, I doubt there are much use nowadays.
     
  4. hp1729

    Well-Known Member

    Nov 23, 2015
    2,309
    282
    :) Not everybody is in the business of designing new stuff, :)
     
  5. Dritech

    Thread Starter Well-Known Member

    Sep 21, 2011
    761
    5
    Thanks for the replies.
    The datasheet state: "The READ instruction contains the 4-bit address of the word to be accessed".
    If I don't know the address the word was written to, is it still possible to read the data from the RAM?
     
  6. absf

    Senior Member

    Dec 29, 2010
    1,664
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    I do understand. I am too playing with 1802 and 6502 MPU and recently I am making a 8-digit multiplex LED display using the ancient 74S89 64 bit TTL SRAM.:D

    Allen
     
  7. AlbertHall

    Distinguished Member

    Jun 4, 2014
    4,230
    961
    You can go through every address and read the data at that location. The problem I think you are trying to solve is to interpret the data and understand what it all means. You can only do that by knowing the format in which the data was written.
     
  8. hp1729

    Well-Known Member

    Nov 23, 2015
    2,309
    282
    Read all 16 addresses.
     
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