Electronics > Projects, Designs, and Technical Stuff
Game ROm..damaged ? 27C040
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nick_d:
The authoritative source is check the datasheet.

The quick way is Google 27c040 vs 27c1001.

By doing that I found that 27c0x0 is compatible with 27cx001.

27c040 = 27c4001 = 512 kbyte.
27c010 = 27c1001 = 128 kbyte.

I believe smaller chip will ignore the top 2 address lines so 4 copies of it will appear in the larger chip's address space.

Apparently the game wasn't large enough to fill up the ROM so they used a smaller and cheaper ROM than what the motherboard could have taken.

Also check filesize of the image you have, if it's 512kbyte check if the last 3/4 is 00 or FF or copies of the first 1/4.

cheers, Nick
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