Htbaa Posted November 1, 2003 Share Posted November 1, 2003 Ok, so today I decided to take another look at my BJL jaguar. I looked at an PM that I got from Robert Demming, and it had some image of the eprom. After doing some stuff I got the rom GOOD in the socket and took my multi-meter. I checked on resistance and all was fine . So I booted up the jaguar, but not image on the TV. I removed the scart cable and hooked up the RF cable. No visual. I did have visual with my working jaguar. I have 3 jaguars, 1 is working and not modded. The other 2 have a socket, 1 is empty and the other one has the BJL rom. Both don't give an image on the TV. I tried it on SCART and RF. I wonder what the problem might be. Is there an IC at the jaguar that does the output for TV and might be damaged or something? I really don't know the problem. Quote Link to comment Share on other sites More sharing options...
TXG/MNX Posted November 1, 2003 Share Posted November 1, 2003 hmm 2 broken jaguars that's to bad I will contact you after the weekend and we can see if we can repair the beasts Quote Link to comment Share on other sites More sharing options...
Htbaa Posted November 1, 2003 Author Share Posted November 1, 2003 Well yeah ok . Quote Link to comment Share on other sites More sharing options...
Matthias Posted November 1, 2003 Share Posted November 1, 2003 Hello! 1) Did you do the mod with or without the BOOT-image switch? If you have added the switch: What happens if you switch to the original BOOT-ROM? 2) Believe me, there is a difference between "no image" and "no image": If the BOOT-image can't be run properly the system produces a very dark screen with some strange lines visible. That's different from the "snow-screen" usually shown when no channel is tuned in at the the tv-set. Regards Matthias Quote Link to comment Share on other sites More sharing options...
Htbaa Posted November 1, 2003 Author Share Posted November 1, 2003 There is no switch. My TV shows a blue screen when there isn't a channel set for it. With RF the screen stays blue, and on scart it turns black, like it should. Quote Link to comment Share on other sites More sharing options...
Matthias Posted November 1, 2003 Share Posted November 1, 2003 Hi! If you have put the socket on top of the original ROM you should try to get this ROM working again (and you should think about adding the switch of course). Matthias Quote Link to comment Share on other sites More sharing options...
Htbaa Posted November 1, 2003 Author Share Posted November 1, 2003 I desolderd the original roms and replaced it with a socket. One rom is totaly destroyed and one is OK, only 1 pin is broken . Quote Link to comment Share on other sites More sharing options...
JagWarlord Posted November 1, 2003 Share Posted November 1, 2003 My BJL doesn't seem to like T2K Keep getting red screen and the game is brand new All other games work though Quote Link to comment Share on other sites More sharing options...
JagWarlord Posted November 1, 2003 Share Posted November 1, 2003 My BJL doesn't seem to like T2K Keep getting red screen and the game is brand new All other games work though LOL , I sound like im rapping Quote Link to comment Share on other sites More sharing options...
Matthias Posted November 1, 2003 Share Posted November 1, 2003 Hello! I desolderd the original roms and replaced it with a socket. One rom is totaly destroyed and one is OK, only 1 pin is broken . Having a EPROM-socket directly on the PCB should avoid some of the basic problems of the BJL-mod, so at the moment i can't imagine what is wrong with your setup (if you have burnt the EPROM properly and have put in the EPROM-chip in the right direction etc.). Can't you test your set-up with a EPROM with the original BOOT-image (You can find this on several places on the net and on Lars' CDs)? Regards Matthias Quote Link to comment Share on other sites More sharing options...
Matthias Posted November 1, 2003 Share Posted November 1, 2003 Hi! My BJL doesn't seem to like T2K Keep getting red screen and the game is brand new All other games work though I think i have mentioned the switch already, didn't i? Matthias PS: And of course the red screen doesn't appear because of BJL. Quote Link to comment Share on other sites More sharing options...
Htbaa Posted November 1, 2003 Author Share Posted November 1, 2003 How am I supposed to flash an eprom? I don't have the equipment. Robert Demming had send me an 512K rom and programmed so that the right bios would get loaded. I might try the original one tommorow I guess. Quote Link to comment Share on other sites More sharing options...
JagWarlord Posted November 1, 2003 Share Posted November 1, 2003 Hi! My BJL doesn't seem to like T2K Keep getting red screen and the game is brand new All other games work though I think i have mentioned the switch already, didn't i? Matthias PS: And of course the red screen doesn't appear because of BJL. Mine has the switch Quote Link to comment Share on other sites More sharing options...
Htbaa Posted November 1, 2003 Author Share Posted November 1, 2003 Then put it at the normal state . Quote Link to comment Share on other sites More sharing options...
Matthias Posted November 1, 2003 Share Posted November 1, 2003 How am I supposed to flash an eprom? I don't have the equipment. Robert Demming had send me an 512K rom and programmed so that the right bios would get loaded. I might try the original one tommorow I guess. Seems I misunderstood this part of your initial message: . I looked at an PM that I got from Robert Demming, and it had some image of the eprom. You were thinking about a picture of the modified Jaguar, while i was thinking about a ROM-image. Anyhow, now you mention a 512KB EPROM. And in one of your other replies you say you have no switch in your BJL-set-up. Now i am wondering how this whole thing should work? A 512 KB-Eprom can hold 4 banks of 128KB-BOOT-images, how are these banks filled (i mean with which content)? Matthias Quote Link to comment Share on other sites More sharing options...
Htbaa Posted November 1, 2003 Author Share Posted November 1, 2003 Yes I ment picture . He said he flashed it in the last bank so I could insert it as it was a 128k rom. He also flashed other BIOS's on it. Quote Link to comment Share on other sites More sharing options...
Matthias Posted November 1, 2003 Share Posted November 1, 2003 Hello JagWarlord! Hi! My BJL doesn't seem to like T2K Keep getting red screen and the game is brand new All other games work though I think i have mentioned the switch already, didn't i? Matthias PS: And of course the red screen doesn't appear because of BJL. Mine has the switch As indicated in my PostScriptum i doubt that BJL (or the BJL-mod) will cause this effect. The red screen (with the Jaguar-logo) tells you that the encryption-validation has failed. If you get it with your BJL-modded Jag, it also means that the original BOOT-ROM was executed and not the BJL-ROM-image. And of course that the cartridge wasn't validated/recognized properly (the usual "clean the contacts, try it several times, push/pull the card a little bit" effect). Matthias Quote Link to comment Share on other sites More sharing options...
JagWarlord Posted November 1, 2003 Share Posted November 1, 2003 Other games work fine. Just with T2K and its not the contacts because I just opened the game, was brand new. I got the game to load once but the controller wont work at the selection screen. Quote Link to comment Share on other sites More sharing options...
Matthias Posted November 1, 2003 Share Posted November 1, 2003 Hi! Yes I ment picture . He said he flashed it in the last bank so I could insert it as it was a 128k rom. He also flashed other BIOS's on it. OK, now you have used the term "FLASHED" the second time. Only a FLASH-ROM-chips can be "flashed", others (EPROMs/EEPROMs) are just "programmed" or"burnt". If you have received a FLASH-chip, then you might have a problem with the pinout of the socket. And at the moment i am also not sure about the "it is on the last bank, so it should work as like it is a 128KB-chip"-part. I would always make sure that the on the socket not available addresslines of the chips have the proper electrical signal level. I think i'll now wait till you have tested with the original ROM. Regards Matthias Quote Link to comment Share on other sites More sharing options...
Htbaa Posted November 1, 2003 Author Share Posted November 1, 2003 Ehm right whatever . I tried the original (the GND was broken, but I did make a connection with some solder) and still no visual. Ah I should also mention this: The first jaguar, I opend it a few times before. It gave me a red screen. After a few times I opend it, I didn't got visual. So I doubt it if it has to do with the bootrom. Quote Link to comment Share on other sites More sharing options...
Stone Posted November 2, 2003 Share Posted November 2, 2003 And at the moment i am also not sure about the "it is on the last bank,so it should work as like it is a 128KB-chip"-part. I would always make sure that the on the socket not available addresslines of the chips have the proper electrical signal level. Aren't the highest two address pins tied to Vcc on the main PCB? They have been on all the Jags I've dismembered It doe sound rather like something is fried though - it should just be a simple EPROM-swap. Are you sure Robert sent you an EPROM and not a Flash-ROM? As Matthias said, they have slightly different pinouts. A 4x128kB EPROM should hve the part number '27C040' or '27C4000', but on a flash chip this will be '29F040'. (could have no letter in the code, look at the top of the chip. Is there a window on it?) Rgs, Stone Quote Link to comment Share on other sites More sharing options...
Htbaa Posted November 2, 2003 Author Share Posted November 2, 2003 Ehm he said it was a 512K flash rom. But if something is fried, what can it be? Quote Link to comment Share on other sites More sharing options...
Ayreon Posted November 2, 2003 Share Posted November 2, 2003 I don't think it was a flashrom.. as far i know he only got a eprom burner. Quote Link to comment Share on other sites More sharing options...
Htbaa Posted November 2, 2003 Author Share Posted November 2, 2003 Well in the PM he said it was a FLASH rom. Quote Link to comment Share on other sites More sharing options...
Ayreon Posted November 2, 2003 Share Posted November 2, 2003 I just spoke with him about it and i think he'll clarify things as soon he gets online again. Quote Link to comment Share on other sites More sharing options...
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