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I just opened a old Dragon Data game cartridge, and observed two socketed "chips" as well as one smaller soldered chip.
One of the socketed chips have a "bump" in the middle, with a white sticker on it, and is marked 2532-55JL B 8301. I guess this is the EPROM, and the sticker is there to prevent the data being erased by light?

The other socketed chip is marked 25P32JL R TI 8301, and the soldered chip says SN74LS00N I8246.
Does any one know what function these two last chips have?

Vato

Sounds like two ROMs and a bit of address decode logic (7400 is NAND gates) so only one is selected at a time. Presumably was cheaper that way than to have one larger ROM.

What puzzles me is that only the first of the two socketed chips have the "erase window". Maybe they used a mixed of EPROMS and non erasable roms?

Vato wrote:What puzzles me is that only the first of the two socketed chips have the "erase window". Maybe they used a mixed of EPROMS and non erasable roms?

I have seen some EPROMS used in Dragon carts where instead of the sticker, the window was painted black. The other posibility is that the second chip is the one time programable version of the 2532.

Cheers.

Phill.

prime wrote:I have seen some EPROMS used in Dragon carts where instead of the sticker, the window was painted black. The other posibility is that the second chip is the one time programable version of the 2532.

Cheers.

Phill.

Thanks Phill,
I guess that's what's called a PROM then?

I have attached a picture of the cartridge.

Vato