Of all the iconic sounds of being in an arcade back in the 80s, Centipede is one of those I would literally hear over everything else.

@LyonsArcade

2 жыл бұрын

It's pretty awesome

@MrHurricaneFloyd

2 жыл бұрын

Its the rhythmic pulsing sound as the centipede advances that screams early 80s arcade.

@CosmicCleric

9 ай бұрын

That, "Run, Coward! ", and "Bounce on humanoid bounce on human" were mine.

"There he is. That little F'er!" It's a Scorpion. BTW, if you put it in test mode, you can roll through screens and find an insect that doesn't appear in the game. It's a Grasshopper. I don't know what his purpose was, but they left his image in the code. Thanks for all the vids, Ron!!

Really enjoy these board repair videos proving just what can be achieved with sound technique and the most basic of tools Thanks again

@LyonsArcade

2 жыл бұрын

Thank you Kevin, we're trying to inspire more people to get into it and they can move up into more advanced troubleshooting with a scope or a logic analyzer, etc. I honestly feel 90% of boards can be fixed with a logic probe

@TangerineWallaby343

2 жыл бұрын

@@LyonsArcade It's been over 18 years since Johnny Nero Action Hero came out in 2004! It's a very fun gun game that's cross between Virtua Cop and Time Crisis! I can't believe it! MAMEdevs is working on Johnny Nero Action Hero rom by decrypting the encrypted data and emulating 3D graphics on vp101 games (including Johnny Nero Action Hero), TNT Amusements Inc. now has it and even Galloping Ghost Arcade has it! Ready to do a video of Johnny Nero Action Hero? Now at Lyons Arcade, baby!

I always liked how this game changed colors during play. The pink and blue combination reminds me of those nostalgic 80's neons.

@LyonsArcade

2 жыл бұрын

Yeah that really helps the gameplay, it's just pleasant to look at. All the combinations are cool too, I can see where somebody would want to play it just to get to a certain color level... I like the red and blue level myself

If I ever make it out that way, I must stop by and say hello! 3 weeks ago I wasn't even aware of the arcade and pinball community. Now I'm learning all about these things!

Thanks for this, I'm getting back into PCB repair and this is a perfect tutorial - please keep showing these!

You have a voice that could read the phone book and still make it interesting and exciting. It ain’t pinball, but still fun to watch you work out how to make it work. Great job Ronnie.

@LyonsArcade

2 жыл бұрын

Thanks Mark we appreciate you watching!

Ron your deductive troubleshooting is an example for all of us. I learn something with each board repair video that you do!

YES! Ron and Joe fixed it. I need in! I wish I could buy this amazing machine. Great work as always boys. TY for brining it back to life.

this video explained so much, thank you!!

@LyonsArcade

2 жыл бұрын

Good Sine thank you for watching!

Dude, the calibration is out on your tube tester!!! JK!!! Keep up the good work. Centipede takes me back.

Excellent work. Another one saved.

Thank you for sharing!

nice job fixing this old Atari game.

I wish I had any clue he was talking about but he makes it look cool

@LyonsArcade

2 жыл бұрын

If you watch long enough you'll know what i'm saying :) Thanks for watching man!

Thanks, Ron!

Ottimo lavoro Bravissimo 👍

I'm sure you'll be getting drowned in comments, but that little guy is a Scorpion, and he's poisoning the mushrooms that he touches. On the plus side, you get 5 points for every poison mushroom after your death. I think you get 5 for destroying a poison mushroom, 1 for destroying a normal mushroom, and 5 for every partially-damaged mushroom that poofs back to health after death. I was never too good at the game, but it is one of my old favorites from the time. I've only recently found your videos, but they're nice to watch, especially the games I used to play a lot when I was younger. Doubt I'll ever actually be able to own a machine myself, but I've always enjoyed repair and electronics work.

@LyonsArcade

2 жыл бұрын

Typhin thank you for watching, that thing does look like a scorpion now that you mention it :) I didn't know that about the partial mushrooms, i'm going to have to think about if there's a good gameplay strategy around that.... hmmm..... Glad you found our channel, we like to have a good time and appreciate these old machines, we try to keep it positive as much as we can.... glad to have you around !!!!

would love a choplifter repair video thats one of my favourite games.

Worked on some other hardware that was build much like this - large pencil erasers are terrific for cleaning edge connectors and chips, use one meant for ink if you need to be more aggressive :)

That machine looks in great shape. Wife loves that game. The only one she played in the arcade back in the day.

@LyonsArcade

2 жыл бұрын

There's a story with that, it's strange but did you know it was the first game designed by a female to hit the arcades? Women love the game but don't even know that a woman designed it... what does she know that we didn't? I personally think it's the colors :)

@b.o.353

2 жыл бұрын

@@LyonsArcade I think it’s the track ball for my wife. In before someone makes a comment about ball handling... but yeah she for what ever reason just connected with the game. Might be the colors. Whenever we go to an arcade that has one she gets a big smile.

@RodsPinballVideos

2 жыл бұрын

@@b.o.353 Back in 2014 I bought a project one to restore and surprise my wife for her birthday, as it's her favourite game as well. Happy days :)

@b.o.353

2 жыл бұрын

@@RodsPinballVideos my wife would flip. Awesome gift!

@PlumGurly

2 жыл бұрын

@@LyonsArcade -- Yeah, interesting. However, Joyce Weisbecker was the first female game coder, just not for an arcade. And Ada Lovelace was the first programmer. There has always been some diversity in the field of computers. Alan Turing was said to be the father of modern computing principles and he was gay. One that folks are not that familiar with is Lynn Conway, who teaches at MIT, the last I heard. She invented the VLSI "rules" to greatly reduce the size of parts, and she also invented the superscalar architecture that modern PCs use. IBM fired her after she got MtF sex-reassignment surgery. So she went to work for Xerox. What caused her to be outed was when she released her IBM work that she took with her to the public, even though she carefully edited/redacted the documents. That only raised curiosity since nobody at IBM had heard of her.

I have to get me one of those logic probes because-of some of the stuff I've picked up

as you probably know the shorts are usualy caused by burnt carbon on the guns from impuritys in tube during manufacture and randomly land on the gun assembly especially on mirror type cabs were the tube is neck down some times not often it can be encouraged to fall back into the tube by careful sharp taps to the neck while the tube is face down. anyway i was trying to repair one years ago when my brother threw a fire work into the garage behind me luckily i heard the fuse sizzling and ran out the tv was switched on .after the very loud explosion i went back and i could hear a ringing sound coming from the back of the tube looked at the front of the tv the picture was shaking believe it or not when it settled down the short was cured not only that but the red wich i had turn up due to low output was now too high i turned it down and tv was perfect. i have been waiting to get another shorted tube to re try this but havent come across one yet.

Hello- My positive and negative 22v test points on my Centipede are testing at 25.9 and 25.2. Does this indicate an issue with my board or power supply? Thank you very much for your help!

Hey Ron, I think your equipment is out of spec....LOL....sorry, just made me chuckle...1993...LOL...Waiting for all the haters to jump in and yell at you for not keeping your gear in spec...LOL.. Great content as always!!!

#sensacional ..😎👏👏😎👏👏🍀👍👍

Great video! However, I too have a Centipede that I'm having problems getting it to run. Upon powering it up, both player start buttons flash continuously and there are wavy vertical lines moving across the screen from left to right. No audio and sounds from coining up the game either, nor can I put it into test mode. Voltages were slightly low on the board, so I bumped them up to spec but still the same problem. Not sure what to do at this point. :(

@LyonsArcade

2 ай бұрын

When the buttons flash very quickly it's the game resetting over and over again because the program figures out something is wrong. If it's wavy, as in you see the image diagonally, it could be that the sync section of the board isn't working. The Sync section is driven by the counters in that area, if you look on the schematics right at the beginning, there will be an area that says like 1v/2v/4v/8v/16v/32v/64v etc. and 1h/2h/4h/8h/16h/32h etc. Those are the signals that create a lot of the timing that makes all the rest of the game work. Also those counters fail often. If you have a logic probe, you can test each one of those lines coming out of the counter, and see if you can find one that's dead. They should be pulsing back and forth as they send a frequency, if it stays low or stays high, that line is dead and the chip outputting it is probably screwed up. If one of those lines is messed up, basically the game can't run code and without being able to run code, it can't run it's ram test.

The enemy that changes the mushrooms and causes the centipede to dive is a scorpion.

Excellent work as always :) I was hoping you'd repair the board with the colour issues lol, as I have a spare board that has just developed an issue where the game boots, but instead of having a black background, it boots with a different colour background every time it starts. any ideas?

@LyonsArcade

2 жыл бұрын

I've got two of them that do that and I can't figure out what it is... the reason it's starting with a different color is because the color ram isn't being controlled properly, it's something with the enable signal on the color ram chip and I can't figure out why it never gets turned on.... if you swap the ram it just makes it a different color, lol Tough problem but if I ever figure it out i'll do a video on it :)

@RodsPinballVideos

2 жыл бұрын

@@LyonsArcade Oh wow, So that is interesting that we have the same issue! Would certainly appreciate the video when you get around to it one day :) Yeah so F2 on my main board shat itself, So I figured I'd run the spare and keep my missus happy as its her game. It worked great for a session and then developed the colour fault on the next start up. It was one of those "C'mon now" moments lol

De-oxit cleaner for cleaning inside the pins on sockets

People have been stripping pokey chips out of atari 7800 ballblazer cartridges.

Newbie here, I have a question. I recently just measured the voltage right at the jamma harness going into my CPS2 A Board and it reads 4.71 volts. It reads 5.1v at the power supply. So it must be losing a little bit on the way to the board. My question is should I try to turn the voltage knob up a little bit to try to get closer to 5v at the harness? Currently the game plays just fine. I just don't want to do any longterm damage. And 4.71v seems a little too low in my inexperienced opinion. Thanks

@LyonsArcade

Жыл бұрын

The best way to check is to measure it on the little fingers on the jamma board (not the harness, the actual board) to see what the voltages are that are actually getting through the connector. Running it at 4.71 won't hurt it but it will probably be unstable and reset from time to time. If it drops that much in the lines the lines probably aren't quite big enough to carry enough current without the voltage drop. Yes though, you can turn the voltage up at the power supply to overcome it, all that is important is how much is getting to the actual board.

That CRT test gear's out of calibration a little bit lol. Best to replace it, I wouldn't trust it. Just post the old one to me and I'll get rid of it for ya 😉👍 Its the least I can do for you guys.

@LyonsArcade

2 жыл бұрын

How generous of you! Only thing is I just had it recalibrated, it's like how they do the fire extinguishers, little old man with glasses came out, looked at it, changed the sticker and said "That'll come to 85 bucks"

I enjoyed the video. The logic probe - my cat, not a fan 😆

@LyonsArcade

2 жыл бұрын

hahaha

Is there a chip that is responsible for the title screen? My title is scrambled and some of the background during gameplay. Any suggestions?

Are you going to keep going with your other Centipede boards?

it's a Scorpion and they turn the 'shrooms poisonous so when the centipede hits one it will drop down. make a lane of 'shrooms with a poison one above it so the centipede goes down that lane and just sit there and shoot for major points.

Scorpion, poisoning mushrooms, poison mushrooms make the centipede(s) rush the shooter. Fleas are the ones who drop through and spawn mushrooms, they start dropping when there are less than a certain number of mushrooms in the shooter's portion of the screen.

Nice walk down memory arcade lane.

When the monitors heater circuit is shorted that means that the monitors CRT TUBE has a shorted heater internally inside the CRT Tube? Even if you used an external power supply to supply the heater voltage it will still short out the heater voltage. The Clock Signal is triggering the Enable pins for all the IC chips which is clocking out the data out of the IC chip or clocking in the data into the IC chip. If you Remove the Clock signal the data should be free running ( not clocked ) because most of the IC chips have an Enable Pin which if you tied direct to +5 volts the data will be active all the time ( not clocked )

@PlumGurly

2 жыл бұрын

I'm not sure if that is right. The /CE or /CS line on most chips just disables or enables the chip. That has nothing to do with the clock, and most chips don't use a clock signal, just registers/flip-flops/latches, counters, and memory. Most of the chips are combinational logic, like gates that work irrespective of a clock signal. Things that require a clock signal is called sequential logic. Registers need a clock since a time reference is needed. What goes in and what comes out relate to different cycles. The output comes from the previous cycle while the input is from the current cycle. On memory, there is asynchronous memory that doesn't need a clock signal. As long as you can do things within its rated time, it doesn't matter if the rest of the circuit it is in requires a clock signal or not. Other types of RAM such as synchronous, registered, DDR, QDR, etc., require one or more clock signals. A CPU is generally a synchronous device, even though they also use plenty of async logic inside. They do make asynchronous CPUs (and even GPUs) but the market is slow to adopt those. They don't use a clock and tend to use twice the amount of logic of synchronous CPUs. They have the potential of being faster since a clock is not limiting the faster parts, and this can simplify the logic since the adders in the ALU don't need to be as robust to fit time constraints and are allowed to vary in the time they take. Sometimes a carry-skip or look-ahead adder arrangement takes up a significant amount of the die space. The main advantages would be producing less RFI, using less power, and being more adaptable to the environment. Like what if you create a bendable CPU? If it is synchronous, flexing it might alter the timing needs and crash the CPU. They'd also be better at adapting to temperature since if they get hot and want to work slower, they adapt to this and slow down (since the handshaking signals are taking longer). And if they get undervolted a little, they would still work, just slower.

@waynegram8907

2 жыл бұрын

@@PlumGurly When using an Oscope to measure the data signals, address signals, control signals on the busses, the Oscope can't SYNC or Trigger to get a stable waveform displaying is because the data signals, address signals, control signals are SYNC to the clock signal frequency. When measuring data signals with the Oscope you have to use the External trigger port to apply the arcade boards clock signal frequency to get a stable waveform display. When getting a stable data signal waveform display and measuring the TIME PERIOD of the data signal, it doesn't MATCH or equal the clock signal frequency that is on the arcade pcb board, any reasons why? Since the Data signals are referenced to the clock signal frequency the data signals time period should be Match to the time period of the clock signal frequency?

TTL logic levels are 0V to 0.8V = 0 and 2.4V to 5V = 1 That's spec.

What's the furthest anyone has seen the Centipede demo screen get? I saw mine get to level 3 once.

@dreamcastfan

2 жыл бұрын

I was watching the demo screen and wondering if it was deliberately playing badly to try and annoy people into playing it to show they can do it better! 😂

Surfing eh.... :)

Great video! Did you change the cpu? Fake?

@1pcfred

2 жыл бұрын

6502 CPUs are not the kind of thing anyone counterfeits. If modern chips were made today they'd be better than the originals anyways. In the early 80s humanity could barely make a CPU period. Things have improved a lot since then.

@0MyWay01

2 жыл бұрын

@@1pcfred In the video Ron states “it might be fake I’ll change it. Just wondering if he did swap it for a known good CPU. We need continuity people! The fakes are non functional. Just the same form factor with the correct part number stamped on it.

@1pcfred

2 жыл бұрын

@@0MyWay01 if it was fake there wouldn't even have been sprites on the screen. No fake could have functioned that much. The buffer was clearly the issue. 6502s aren't worth faking either. They're still readily available. It looks like they're even in production still. Just not from the original manufacturers. The new ones are likely better than the originals were. Diffusion tech has improved in the past 40 years considerably. So even Wang Hung Lo in China can do it better today.

@PlumGurly

2 жыл бұрын

@@1pcfred -- Well, only the WD65C02s are being made now. If you need the original (like fixing an Apple), you pretty much have to go with used or NOS, and that's even harder if you need one from the "Sally" run to fix an Atari computer. There were "counterfeit" chips back in the day. RAM often came with no markings at all. Some RAM was made by Mostek (junk), and that was not the same as MOS Tech (among the more reliable). What hobbyists and repair folks need to watch out for today are things like the 74xx chips, EPROMS, and sound chips.

@1pcfred

2 жыл бұрын

@@PlumGurly I have a lot of 74XX ICs from back in the day. I used to work at an assembly house and the boss gave me any extras we had lying around. Plus I scrapped a lot of parts. I was never into Commodore or Apple though so I don't have any of those special chips.

Do you have any experience repairing two-way radios ? Or know anyone who does ? I have 3 RCI-1000 handheld 1 watt 2 channel VHF crystal two-way radios 2 if them work, I put new rechargeable battery packs in them and they came back to life, but the third one is locked on in transmitt It is not sending out audio from the microphone I think there must be at least 1 transistor that is locked on and is sending power to the transmitter part. It could be a short through a resistor or capacitor doing this, or a transistor causing it to stay in transmit all the time. These are from the 1990s, early 90s, and they have 4 crystals, 2 for receive and 2 for transmit These are 2 channel, from a slide switch on the top. The company Ranger Communications is out of business and I can't find any schematic for the radio. If anyone knows where I could get a schematic online for this model, that would be a big help Thanks

Those horizontal moving creatures are Scorpions.

@LyonsArcade

2 жыл бұрын

That makes sense!

What is “the pokey”?

@LyonsArcade

2 жыл бұрын

It's the name Atari gave one of their custom chips, "Pots and Keys", it handles some of the inputs and the audio along with a couple other things. I think on Centipede it doesn't do any of the inputs though.

@VegasCyclingFreak

2 жыл бұрын

@@LyonsArcade Thanks. I heard that term on another one of your videos and I was thinking what the heck is that?

@youssefandroid237

2 жыл бұрын

kzread.info/dash/bejne/p2yTwdGip8mnf7w.html

@PlumGurly

2 жыл бұрын

It is the POrt and KEYboard controller for the Atari home computers. However, they also include 4-channel sound. Those are interesting chips in that they also have a high-res sound mode that was rarely used since that sacrifices up to 2 channels. Most applications used them in 4-channel mode, and that was part of the motivation behind the Commodore SID. The higher res mode is 16-bits, and the lower res mode is 8, and it is hard to correctly represent a notes table using 8-bits. So a few notes may sound out of tune. And Commodore believed they could do better and created the SID. There are even specialized versions of these such as the Quad-Pokey. A quad Pokey is next to impossible to find for the arcade games that need them, but thankfully, there are FPGA replacements. If you need an FPGA Pokey or SID, while they won't sound exactly the same, they are very close and indistinguishable to most.

@VegasCyclingFreak

2 жыл бұрын

@@PlumGurly Thanks for the in depth explanation. That makes it very clear.

Yeah, if you don't get 3-4 volts at the chip, you never go past the metastable zone. So yeah, you need the 5 volts to be there. And yeah, the reset signal holds the program counter to 0 or whatever the starting vector address is. The entry vector might be $0200 on the 6502. I figure that because you have Page 0 ($0000-$00FF), and the stack page ($0100-$01FF). The program counter might have garbage in it, so reset puts that in the right place. Also, the reason to hold it there for a couple seconds is to give the rest of the board time to start so the CPU doesn't start until then. From what I saw with the flashing, I'd assume it is a pot on the monitor. But, it was an internal short.

Yodelayheehoo

@LyonsArcade

2 жыл бұрын

Good Morning Lil Everette!

Little guy is a Scorpion maybe?

It’s a scorpion

Ron I think your calibration on your tube tester is a little out of date 🤣

Ron: "stay high all the time" 18:24

@LyonsArcade

2 жыл бұрын

WHOOO PUFF PUFF PASS

Still trying to understand electronics but just can't..guess I'm not wired that way 😔

@LyonsArcade

2 жыл бұрын

Just do a little at a time, eventually it will click... I don't know much and have been doing it for years

@naytch2003

2 жыл бұрын

@@LyonsArcade I got books on electronics at home, hell I got an uncle that's a sparky(electrician) if I applied myself I guess I could

@naytch2003

2 жыл бұрын

@@LyonsArcade I'll get it one piece at a time and it won't cost me a dime 😁

@1pcfred

2 жыл бұрын

@@naytch2003 it helps to have some hands on experience to reinforce concepts. If you really want to understand electronics then get an oscilloscope. Then you can see what's going on. That's it. Learn how to use an oscilloscope and electronics will make more sense to you then. There's books available that explain scope operation. I'd say the other important thing to learn is Ohm's Law. When you start blowing stuff up understanding that is how you keep the magic smoke in stuff. I knew a guy that hated LEDs because he tried to use them in his model train set and one blew up and hit him in the forehead. He couldn't grasp that you had to limit the current to the device. It was different than light bulbs.

.....my poor ears!

@LyonsArcade

2 жыл бұрын

Be stronger