MIPS with Mars sim. - how to read a value from a keyboard input automatically (i.e. - no pressing enter to get the value)

Is there a specific sys开发者_开发知识库call or something I am missing in order to accomplish this?

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You have to use syscall #12 to read a character. See the MARS syscall sheet for further details. Here goes an example that reads a character from console and prints the next ASCII code char

loop:  
  li   $v0, 12       
  syscall            # Read Character

  addiu $a0, $v0, 1  # $a0 gets the next char

  li   $v0, 11       
  syscall            # Write Character

  b loop
  nop