Give me a few days here and ill take a look at the rtc for police 911 2 and ill let you know.
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RTC Self Check Error
- Thread starter SilverDuck
- Start date
t153
Member
that would be great, thank you.
t153
Member
Hi, did you have any success so far ?
Negative..looks like channelmaniac will have to do it.
t153
Member
Hi there, I just sent a pm to 'TheGuru'. He is able to dump the chip in the proper way. Are you still willing to send him your good p911/2 RTC chip for dumping ?
mattosborn
Well-known member
Him and hundreds of others here. There's no magic to dumping that chip... it's just a battery-backed SRAM.
t153
Member
that's right - you just need a burner that is able to write the m48t58y without destroying the data on MrSinister's original/stil working chip. My burner is not compatible with this device and he was one of the guys offering his help... if you can do the job also, that's find... so why didn't you respond to this thread...
mattosborn
Well-known member
Any EPROM burner can read this chip. It's a standand 8Kx8 JEDEC pinout, so you can read it like a 6264 SRAM, or a 2764 EPROM. Programming a battery-backed SRAM is fairly simple as there is no special programming voltages or algorithms.
As someone else already pointed out, there's always a risk of corrupting the chip, however slight. I'll be happy to dump it, but if the guy gets it back and his game doesn't work then he's SOL.
t153
Member
Hi & thanks, I just went thru the datasheets and yes, the pins are corresponding. Just if you have more knowledge about these chips - as M48T58 and MC2764 are "equivalent" in the way the data is written/read - would it not be possible to just replace the annoying 7-years-battery-lasting-M48T58 with an 2764 EPROM ? there's no RTC in the 2764 that's clear - but if that's used(?)... just an idea...
mattosborn
Well-known member
They're only equivalent in the way they're read. That NVRAM/RTC is accessed read/write, as it is probably used to store statistics (audits).
As I said before, I have a hard time believing that that chip needs to be programmed at all. I don't own that game, so I can't say for sure, but typically you'd just pop a new chip in there and the game will reinitialize it (you may need to go into setup mode). You've tried that, correct?
t153
Member
I replaced the M48T58 with a fresh one (an another as well...) - same error message (RTC SELF CHECK BAD...) but there's no access to a "setup mode" during this phase - the game has still to be initialized.
mattosborn
Well-known member
The Test switch doesn't get you into setup? There may be a dipswitch that does it as well (I believe those motherboards have a bank of 4 dips). I wish I could be of more help, but I don't own a Viper system... I'm only familiar with System573/Bemani.
t153
Member
I have an excellent burner now, the Batronix BX48 and am able to burn the M48T58 (tried it already with several other viper games) but still need someone who has a working Police 911/2 to read the NVRAM from. anyone willing out there ?
SilverDuck
New member
Great news. I was able to replace the network card on my Racing Jam boardset that Channelmaniac worked on, and the RTC SELF CHECK ERROR is gone!! So...the repair he performed was a success! Thanks!
Necro bump!
I have a Warzaid here for a local customer that I fixed tonight... and since the RTC was socketed, I backed it up.
RJ
I have a Warzaid here for a local customer that I fixed tonight... and since the RTC was socketed, I backed it up.
RJ
Did you ever get this? I've been watching this thread closely, since I've got a Police 911/2, and I definitely am worried about it dying on me. It's a conversion from Police 911 though (with extra key), so I'm not sure whether it'd be the same NVRAM or not.
Anyway, I've been considering desoldering the chip and dumping it for a while... I may do it next time I have the cab away from the wall. I'm slightly worried about screwing it up somehow, though I know I have the skills to do it fine. I just hate to screw something up being proactive, though I also hate having something die, knowing that I could have saved it if I had just been proactive.
DogP
t152
Member
Hi, and nope - no one seems to have the same version that I had. Mine was a conversion too but it didn't need the key to be plugged into next of the card slots. It was working just with some proper NVRAM code - which is gone now and I'm still looking for someone who has this piece of code to write it back into a fresh M48T58 chip.
