Gravitar Proms files Needed

Talon2000

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Gravitar Prom files, Still Needing

Wanting to check my Gravitar Proms R1, and R2. But Non of the Mame versions I've found include those prom files.
 
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That's cool. Hopefully someone knows where I can find them or has a copy. Surely someone does.

Signature analysis is showing a bad Prom, so the Roms can't be read.
 
I know it's a long shot,
but if anyone wants to send me their proms,
I'll be happy to read them (...send them back...) and provide the images
into the Public Domain.

The catch is that I'm in Canada...


Steph
www.Hobbyroms.com
 
Well I could do that, but I think the main problem is the chips are soldered on the board, or at least mine are. It seems odd that these aren't already out on the net somewhere.
 
Unfortunately those are address decoding PROMs and won't be in MAME... that's the same with those silly PAL chips on other games too. :(

If the PROM has a couple of bad bits maybe you can reverse engineer it from the memory map.
 
Where did you end up finding the PROM files? I would be interested in them for the Atari vector games if someone has them.
 
For closure:

Both of these are 32x8 PROMs such as the 82S123, 7603 or 27S19.


PROM 136010-111 @ Location R1 on Atari Gravitar or Black Widow PCB

0x00 : fd fd fd fd fc fc fc fc fc fc fc fc fd fd fd fd
0x10 : fd fd fb fb f7 f7 ef ef df df bf bf 7f 7f 7f 7f


PROM 136010-112 @ Location R2 on Atari Gravitar or Black Widow PCB

0x00 : f6 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 fd fb e7 d7
0x10 : b7 77 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7
 
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