Do you know where I can purchase one chip of AT89C51SND1C?
If you included your location in your user profile, someone might be able to help you.

I am a college student .... May I know what Development software do you use for the chip?
For a MP3 player (somewhat complicated), I think you are a bit up the creek on this issue, The logical choice would be Keil ($2500) or Raisonance (about half), but as a student you will probably have to use SDCC with its quirks. I have not done much with SDCC, but I will recommend that before you do this you select a simpler project and get used to the '51 rather than the compiler/assembler quirks by using the eval version of Keil or Raisonance (it just strikes me that would be K & R - what a coincidence).

Erik

anyhow, lest I forget, before you start read "the bible"

here are the links to "the bible"
Chapter 1
http://www.semiconductors.philips.com/acrobat/v...ARCH_1.pdf

chapter 2
http://www.semiconductors.philips.com/acrobat/v...UIDE_1.pdf


chapter 3
http://www.semiconductors.philips.com/acrobat/v...WARE_1.pdf