Gauntlet Dark Legacy: Will not boot

RebootMac

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Hey Everybody,
So I tracked down an old thread that asked this question, and maybe now someone has an answer. I have a legends cab upgraded to legacy that is throwing: "no audio detected" and restarting the entire board. I've ran the sound test and it will not communicate with any audio component at all. It's on the dedicated gauntlet legacy cabs. With a Vegas 777 sound and IO board. I'm running new chips and the hard drive test comes back clean. The HDD is brand new. Am I missing something obvious? I've seen online that these boards are less than reliable. But running the power supply I'm only getting 11.98 on the the 12+. But im getting over 5v on my 5+ lines off of the Jamma connector. Still kinda newish to this. What am I missing? What should I be looking at? Do I need a new Vegas board? LED 8 is showing solid/ locked up.
 
if you would like to know more about voltage, read the PSU guide in my signature.

make sure you have your chips are installed in the correct spots. (if they're from a kit they should be labeled where to go) the sound rom should go on the JAMMA interface, along with the security chip, while on the CPU board will be the boot rom to interface with the hard drive.

error 8 signifies a boot rom error, and the boot rom should be installed in the top U27 socket (not the bottom "option" socket)

on the subject of power, the thing that will sink your ship the fastest is if your JAMMA edge is burned up. prolonged use of Vegas hardware with the power supply adjusted too high (you want it to be 5.10V or lower at the chips or red/black wires on the hard drive plug) will burn up the +5 contacts on the edge connector. once compromised, it will lead to substantial drops in voltage between the power supply and logic components. the only longterm fix would be to replace the burned contacts with copper tape. people in the past have hacked power into the hard drive plug, but that's a single wire when the game is supposed to have 4 wires going in -- it's not enough throughput for the current the power supply puts out on the +5 line.
 
Alright. Thanks guys by the way. My 5 volt was high coming off the jamma connector, bit the board itself doesn't show signs of burn. The biggest issue is that while I can tune the 5 volt higher the twelve volt output will not pass 11.85. that's out of the jamma. I'm swapping the power supply tonight with a new one that just arrived from Happ. I double checked my chip positions and directions with the instructions. It all lines up. Update to follow.
 
Also Just a FYI those boards REQUIRE -5 They will not boot without. Also The +12 being low is not really a big issue. I have one here that loads the +12 down to 10.8 +- and it works fine.
 
Hey guys. So just an update. Pulled chip readings and adjusted the power to 5.10. getting good voltage at U18 U37 U44 and now the HDD. The problem persists. Pics to follow. Other than the jamma is there a good board location to check -5? I'm scouring the manual but may be overlooking it in my frustrations.
 
The results of the sound hardware test.
5420442591990420456003104cf9ba0a.jpg
 
I know the player jumpers are not connected. But the jamma edges and connectors are clean. Polished them today with an eraser and contact cleaner.
14e4a84e7b45fbd31e989d444354dca8.jpg
 
So the game is throwing error code c for bad eprom at U44. Tomorrow I'll hook it up to the reader and try to pull an image to compare to mame. Update to follow.
 
Pulled code from U44 audio boot instructions eeprom in an attempt to rewrite. Will the mame file include this binary?
 
I looked in the MAME set. gauntdl.bin should be the CPU/hard drive chip, vegassio the sound chip on the JAMMA board (or SIO)

obviously you can compare checksums. I was under the impression your roms came from a CF kit set. ie. brand new
 
The security at U37 and the boot at U18 did. It did not come with the eeprom at U44. Which is Vegas audio boot bins apparently. I pulled the chip, hooked it up to the GQ-4 and pulled the binary for a copy of what's there. I'm trying to verify the code now.
 
That Vegas sio is what I need I believe. The issue is that without it or a semi working audio board the startup self check will simply dump the reset the entire board.
 
Hey all. Just an update. Got a Vegas set from a friend out of a rush 2049. Swapped the boards and ran the new dark legacy kit and got a IOSAC bad security chip error... So I'm dealing with that now. The kit is new from arcade services. Any ideas?
 
contact them. I think they've sold some duds and I'm fairly certain they take care of the problem.
 
I believe it uses a Durango kit? I looked it up and it seems it's compatible with dark legacy kits but not legends. I'm running a legacy kit with a U37 chip and U18 chip. The error though is coming off the LCD display. I'm not getting anything off the monitor now.
 
I want to say that Arcade Services repairs Vegas boards too. That might be the route that you want to go.
 
Yea. That'll be phase 2 I'm afraid. I wanted to take a crack at it myself. Never dealt with one of these though. And it's been sitting unworking for 2 weeks on the arcade floor. It's getting to be that time though. I was hoping to use the Durango board in the meantime while the Vegas was out to them.
 
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