Having EPROM issues.

[AtariBorn]

A few years ago, I flashed a couple ROMs on EPROMs and for the life of me, I can't remember how to add the universal encryption before splitting the ROM. I remember having this problem before but I figured it out eventually.

 

I'm trying to flash the AC2011 Doom 2 hack (4 Mb) but when I use PC Jagcrypt, it spits out either two 4 Mb files (HI/LO) or four 1 Mb files (U1, U2, etc.). I'm needing two 2 Mb files (HI & LO) for a 2 chip board.

 

I've tried Romsplitter and it works but no encryption option just proper splitting, correct number and file sizes.

 

I don't believe I used a hex editor to inject the header manually before using Romsplitter but I may very well have.

 

I also remembered to byte swap before burning. Anyone have any suggestions?

Edited March 14, 2015 by AtariBorn

[Shamus]

You might want to look here:

 

http://atariage.com/forums/topic/235779-create-and-burn-eproms-for-standard-jaguar-2-chip-cartridges/

[AtariBorn]

Well, I've had no success with this. I've tried everything I can think of. I've went as far as stripping the header out altogether, using a hex editor and trying to add the universal encryption from there, to no avail.

 

I still don't understand why jagcrypt outputs a 4Mb HI and a 4Mb LO when I started with a 4Mb ROM. What's eve more strange is, I tried the "single file" option, hoping to just encrypt the ROM so I could use Atari's Romsplit and the single file I ended up with was an 8Mb file. What?

 

I like Jiffi and I was able to add the universal encryption that way but only after I deleted the ROM's original header first. For some reason, I still get a red screen. Too bad Jiffi doesn't have a ROM splitting and byte swapping option. It would be nice if it could convert ROM images into EPROM images with the encryption intact.

 

I think I'm going to give this one a rest and come back to it later.

[Voodoo]

Personally, I've never had to add the header. Most roms can just be split and burned with romsplit -w romname.rom (or .j64, .jag, .bin). Just tried it now to be sure, and I end up with a HI and LO at 2,048KB each.

[AtariBorn]

Yeah, Romsplit works fine for me, in fact, it's the only program that gives me the proper sized HI & LO. But it doesn't encrypt the ROM to properly boot on an unmodded Jag. I've burned and erased about 12 times and I can't get the ROM to boot without a red screen. The encryption is my issue.

[AtariBorn]

These are the files I've been working with:

 

Original Doom 2 AC 2011 ROM

 

Doom 2 AC 2011 Without Header

 

Universal Header

[Voodoo]

I'll have a look on Monday if nobody does before. All my gear is in work

[rayik]

Don't use jagcrypt. With the no header version, either add the univ.bin header manually or use tursi's makefastboot.exe to add a 1 second verification header. Then use romsplit with -we switches (romsplit -we file.bin) In the last couple of months I've formatted and burned 52 different games. I don't know why but a couple required the -e switch with romsplit to produce working .hi .lo files.

I just checked the univ.bin file you posted and it's good.

 

 

EDIT - AtariBorn, just sent you a PM

Edited March 21, 2015 by rayik

[rayik]

AtariBorn - Your files are good

 

• AC 2011 no header file
• manually added univ.bin to the beginning of that file
• romsplit -we D2 .jag (rom file must use 8+3 naming)

 

.hi .lo files are good and cart plays ok.

[AtariBorn]

Did exactly what you did. Waiting for my LO to finish burning.

[AtariBorn]

Ok. still nothing. Did you byte swap before burning?

[rayik]

Ok. still nothing. Did you byte swap before burning?

 

No

Edited March 21, 2015 by rayik

[Zerosquare]

Are you sure your hardware is good?

[AtariBorn]

I finally got it to work. The whole problem was me byte swapping. I could have swore I always had to do this in the past, just before burning. I guess my memory isn't as good as I remember.

 

Thanks for the help guys.