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I have a UMK3 with intermittent U13 ram errors. the background will do like a loop thing as you go left and right on the screen. I never attempted to logic probe it and see if any of the lines are showing bad. those rams should be tied to the Williams Custom Chip, like Asure said, it can be...

I think I had this problem on one of my NBA Jam boards, replacing the UA4 7407 chip fixed it if I recall. might be something to check.

yep those Philips caps unfortunately are getting very bad. Williams used these on their WPC pinball games also and the conventional wisdom within that circle is the Philips caps should be replaced, but the iC caps are fine. the latter were used more on Y-unit games, T-unit is when they made the...

necro bump, I was changing Hyper Fighting US to Turbo JP and ran into the same problem. I followed your wisdom and switched the 4C and 5C roms around and it worked. thank you

@Asure I know the announcer guy, Tim Kitzrow. on the credits his name was misspelled TIM KIZEROW are you able to fix that? I think there may be other typos, I'll have to track them down

I hate to bump this thread but I bought a CPS1 set that had a C board with Japanese text and thought it would be fun to turn Hyper Fighting into Turbo JP. I bought 27C400 roms to replace the 10-13 roms and while I can see the TURBO letters on the title screen unlike random red and white...

yes, you need the sound board connected. assuming you don't have the boards connected, on T2 the CPU board ribbon cable goes to the driver board first and from the driver board to the sound board. always align the red stripe on the ribbon cable to the pins labeled 1/2 on the boards. [pictorial...

I figure if you're asking about 8-way joysticks that you're probably going to run it with a standard res monitor like K7000. that's why you would need to change the resolution. if you post pictures of your monitor I'll be able to determine what you need.

U8 switch 1 to OFF will get you 8-way joysticks yes also for standard res graphics U8 switch 2 to ON and switch 3 to OFF

it's a bunch of little PAL chips that are supposed to be for security in the vicinity of the CMOS. and yes AUTOERASE is U115. manual calls it a PLD Autoerase Ctrl. those are the same between NARC Z-unit and Y-unit games, as are the Custom Chips.

Custom Chip and AUTOERASE chip are different components. I've never seen T2 with the Custom Chip socketed. they're kind of a nuisance to work with. I stole a socket from a High Impact Football board a couple years ago and soldered the chip in direct, it's apparently missing a connection...

the 40 pin AUTOERASE chip by the U99 Williams Custom Chip(tm) can cause all kinds of weird stuff on Y-unit games. the original socket is single wipe, I don't know if it's corrosion on the legs inside the socket or what but you get a lot of mileage out of replacing the socket. especially if you...

you're a good citizen

lol I already had it downloaded. /me slaps face also thanks @tendril

there's like 800 pages on this thread now, do you know where I can obtain this test rom?

I think there's been some suggestion somewhere that the ram capacities differ depending on what games they ran. I don't believe that cause they would run the same standard parts. my one RWT board has one of those timekeeper oscillator gimmicks on it, were those all WrestleMania conversions or...

some near 14 years ago, the owner of the banquet hall my wedding reception was at (RIP my marriage) asked me to fix a couple video games. the Pac-Man had my jedi master's sticker on it, he sold it to them. LOL so what wound up happening was it looked like your monitor, basically no sync. the way...

yes that would make it run as Pac-Man and is typically the first thing I would suggest doing in the condition yours is in but I didn't have you done any work to the sockets on the main board? the conventional wisdom I share, from personal experience of course, is that the traces and solder...

yes, the ribbon cable is what carries the Z80 from the daughterboard to the main board. any broken pins on the ribbon cable gimmick will equate to being a broken CPU pin at the main board. out of absolute desperation at a location where I NEEDED to make the game work again I wound up jamming a...

I haven't had a whole lot of free time on my weekends lately, I apologize. maybe with long holiday weekend I can make an attempt at programming roms. I'll let you know.