Two 24 pin chips inside atari 800 cart?

[TonyA]

I bought a cartridge on ebay called "Music Composer" for the Atari 400/800.

 

Inside are two 24 pin chips. The markings on the chip itself are: CN42509N and CN42508N

And below each chip, on the circuit board markings are: A601 & A602.

 

Anyone know what the modern equivalent of these chips are (for direct replacement)?

 

I was hoping I could read the code on these chips.

 

Thanks for any advice.

 

Tony

[+David_P]

Atari had custom made ROMs, so there are no drop-in replacements. Pinouts can be found at:

 

http://www.atarimax.com/jindroush.atari.org/achroms.html

[TonyA]

Atari had custom made ROMs, so there are no drop-in replacements. Pinouts can be found at:

 

http://www.atarimax.com/jindroush.atari.org/achroms.html

 

Thanks, I appreciate the info.

 

Tony