Retrieving and combining .bin from Proto Sega mega drives Eproms

Hi Everyone,

Seeking assistance in the conversion process from physical eproms to .bin file suitable for emulator use.

I picked up some Sega mega drive prototype roms from ebay, for Spiderman TV and F1 Championship Edition,

They have black and white labels from Acclaim UK with Eval only written on them,

I don't think there would be anything on them that hasn't been dumped but I thought it would be an interesting exercise anyway,

I have 4 eprom's for each game, 32pins each marked rom0 to rom3
there are stickers over the window and the etching but I figure they are 27c040 512kb x 8.

I have read them as 4 separate files (.bin)

I gather that I now need to do 2 things, combine rom0 and rom1 into 1 16bit file then do the same for rom2 and rom3.

then add the 2 files sequentially into 1 file.

I have found a utility called binlohi which does the reverse from a emulator file.

Any help would be appreciated,

 

Winhex, sounds like you want to interleave rom 0 and 1 and then interleave 2 and 3 and save them.

Then just do copy /b part1.bin + part2.bin game.bin

 

Hi Bad_Ad84,

thanks for the info, you were correct I used winhex to combine the lower and upper roms using "Tools - File Tools Unify - bytewise and selecting the 2 halves. The 2 sets of files were then joined together using the "Tools - File Tools - Concatenate and selecting the 2 files to join.

I'm trying to figure out if they are already dumped in GoodGen v3.21, Not getting a match. I'll upload the files if anyone would like to take a look,

The roms run in an emulator, So I think that I dumped them correctly.

 

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