Hi, Atari Freaks, this is my first post here, I’ve lurked here for a while but up until now have not had anything worthwhile to contribute.
Back in 1991, I went in 3rds in an Atari 2600 JR 128in1 with some drinking buddies, after a few years I lost contact with them and the Atari ;-(
A few years ago, I started to play around with some emulators and wondered if I could find a dump of the 128in1 ROMs.
After downloading the 128in1 ROMs, I found that something was wrong with those images. Firstly, the file size was wrong, 4k x 128 = 512k / 4(ROM chips) = 128K per chip, but the files are 64k ???
Then I heard that one of the ROM’s was the one used in the 32in1 cartridge (2K games), so maybe one of the files should be 64k, but I don’t remember those games being sequential in one bank. And the other 3 ROM’s at least should be 128K.
I split the 128in1 images from the net and found that the one ROM is 32 x 2K but the others are only 16 x 4K, Therefore I believe that the first ROM image is maybe from the 32in1 and the other 3 are fake or incorrectly read on an EPROM programmer using 27C512 pin out, thus – only half the size.
Question: Is the 32in1 PROM 64K (27C512 pin out) or 128K with A16 on pin 22 ?
Recently I acquired a JR 128in1 so I could solve this fake ROM issue.
After tracing out the PROM pin out and making an adaptor for my EPROM programmer, I finally have the correct dumps
Using Stella 3.3 with the latest snapshots file, I found that most of the images are recognised with a snapshot picture and a description. However, most say (“game” Unknown PAL). All of the 2K games are doubled up to 4K however they are mixed throughout the 4 ROM’s
So it looks like someone has dumped most of the ROMs before, but distributed them - split up.
I think the naming of the files in Stella should say something like ->
32in1 PAL 4K -> 128in1 PAL 4K <- If the 32in1 cart is a 64K PROM (2K games)
Unknown PAL -> 128in1 PAL
Old 64K files -> 128in1 PAL fake
Anyway, ill leave that up to all the hard core Atari Freaks to work out, Have Fun !!!
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2600 Rom Comparisions and Dumps
in Atari 2600
Posted
Hi, Atari Freaks, this is my first post here, I’ve lurked here for a while but up until now have not had anything worthwhile to contribute.
Back in 1991, I went in 3rds in an Atari 2600 JR 128in1 with some drinking buddies, after a few years I lost contact with them and the Atari ;-(
A few years ago, I started to play around with some emulators and wondered if I could find a dump of the 128in1 ROMs.
After downloading the 128in1 ROMs, I found that something was wrong with those images. Firstly, the file size was wrong, 4k x 128 = 512k / 4(ROM chips) = 128K per chip, but the files are 64k ???
Then I heard that one of the ROM’s was the one used in the 32in1 cartridge (2K games), so maybe one of the files should be 64k, but I don’t remember those games being sequential in one bank. And the other 3 ROM’s at least should be 128K.
I split the 128in1 images from the net and found that the one ROM is 32 x 2K but the others are only 16 x 4K, Therefore I believe that the first ROM image is maybe from the 32in1 and the other 3 are fake or incorrectly read on an EPROM programmer using 27C512 pin out, thus – only half the size.
Question: Is the 32in1 PROM 64K (27C512 pin out) or 128K with A16 on pin 22 ?
Recently I acquired a JR 128in1 so I could solve this fake ROM issue.
After tracing out the PROM pin out and making an adaptor for my EPROM programmer, I finally have the correct dumps
Using Stella 3.3 with the latest snapshots file, I found that most of the images are recognised with a snapshot picture and a description. However, most say (“game” Unknown PAL). All of the 2K games are doubled up to 4K however they are mixed throughout the 4 ROM’s
So it looks like someone has dumped most of the ROMs before, but distributed them - split up.
I think the naming of the files in Stella should say something like ->
32in1 PAL 4K -> 128in1 PAL 4K <- If the 32in1 cart is a 64K PROM (2K games)
Unknown PAL -> 128in1 PAL
Old 64K files -> 128in1 PAL fake
Anyway, ill leave that up to all the hard core Atari Freaks to work out, Have Fun !!!
PS: Have a look at the names on the game card !
Atari128in1.zip