Wow. You're the first person to actually explain HOW it happens. Everybody else just said "256 wraps around to 0", and that's it

@groszak1

6 жыл бұрын

I agree. The 255+1=0 thing alone doesn't explain the messed up stuff on the right side, but this video does.

@yarde.n

5 жыл бұрын

It isn't so simple to understand that it relates to the level counter.

@cubah1

5 жыл бұрын

It's Y2K literally. Wraps to zero and everything goes haywire

@neilisbored2177

5 жыл бұрын

@@cubah1 Except it happened

@3lH4ck3rC0mf0r7

5 жыл бұрын

@@neilisbored2177 Y2K did happen. But every programmer and company saw it coming from miles away and braced themselves to handle it gracefully.

Coincidence or not, saying 256 at 2:56 is pretty amazing

@azetac_

4 жыл бұрын

Devon Hayden He does not, unfortunately.

@kinghotcoc0

4 жыл бұрын

It seems like he said hundred fifty six, but ehh he says 256 so you're right

@icenesiswayons9962

4 жыл бұрын

@Ersanio That was a coincidence, like back in the day, we'd watch TV with the volume off and the stereo wide open and hear things that matched the TV screen. Sometimes it made more sense! Lol.:-)

@mackback319

4 жыл бұрын

@@icenesiswayons9962 you sound like a boomer

@favoritemustard3542

4 жыл бұрын

@@mackback319... you sound like a sooner

For anyone left wondering why the tiles are drawn in such a weird order, I'll have a go at explaining. I think it's a really clever solution, but some might find it boring, so... As Pac-Man is an 8-bit machine, it is only capable of counting up to 255, but the display resolution is 224×288. In order to get pixels beyond 255 for the height, some are taken from the sides and put at the top and bottom of the screen. In practice this means that the tile map in memory is 32×32 tiles, where each tile is 8×8 pixels, but the tile map is displayed as 28×36 on the screen. The maze is still 32×32 tiles, but columns 0 and 1, and 30 and 31 are not visible. This is the reason the characters disappear when the go through the tunnels. The reason the main part of the screen is drawn top to bottom and right to left is that the whole screen is rotated 90 degrees to be in portrait aspect ratio. The cabinets just used standard 4:3 CRT screens turned on their sides.

@RGMechEx

6 жыл бұрын

That is actually really interesting!

@lolyouyouutoo967

6 жыл бұрын

You deserve a like, my friend.

@Burn_Angel

6 жыл бұрын

Huh, and I thought the game writes the graphics from top to bottom and from right to left because it's japanese.

@stevanthewise7240

6 жыл бұрын

That actually makes sense!

@smh4771

5 жыл бұрын

Then, what is with the classics made in 2016? Bandi Namco created just "PAC-MAN" for the mobile version allowing a classic mode, through all the advancements for 38 years caused better and advanced stuff, having an advantage of removing a problem of a kill screen caused long before at 1980. So really, it can be hard to do in the mobile version, so right now, the kill screen is possible to fix. Saying goodbye to the level 256 38 years ago.

Interesting fact: Namco Classics for the Nintendo DS has an option in the settings to fix the 256 level bug, allowing the game to continue :)

@AtKiba

6 жыл бұрын

An option?? You would expect them to just fix it without asking.

@LexEllis

6 жыл бұрын

They did fix it without asking, but it is in the options menu of the game you can fix the level 256 glitch or leave it as is if you want to witness the glitch for yourself.

@BillehBobJoe

6 жыл бұрын

AtKiba Canal i don't remember when the last time you played pac man but surely you remember level 256 is no easy feat

@zingodoom

6 жыл бұрын

If they do something of their own volition like that, then why would they?

@LasagaMan

6 жыл бұрын

actually they did but only skilled pac-man players can get to level 256 with the fix on.

3:50 That falling 1 is so sad. :(

@UberMun

6 жыл бұрын

don't worry, the carry flag will catch him

@superstarstudio8994

6 жыл бұрын

*R.I.P 1*

@IammeoramI

6 жыл бұрын

F

@gabrielandy9272

6 жыл бұрын

the love on the animations are so cute :O

@pete91

6 жыл бұрын

This is so sad Can we hit 2 likes

Oh, the havoc a simple integer overflow can cause. It never stops being entertaining.

@fukkthisnewupdate8882

6 жыл бұрын

nin10doadict you might want to check out stryder7x for more glitches. He only does Paper Mario though, so you might not be interested.

@DaniPaunov

6 жыл бұрын

and an integer underflow in that game can cause a softlock in every room with enemies

@tattersthebat6253

6 жыл бұрын

In other words, playing Pac-Man crashes Paper Mario.

@nin10doadict

6 жыл бұрын

Actually I've been subbed to stryder7x for quite a while now. :D

@user-ft4pb5vb3e

6 жыл бұрын

Link8304 - Gaming in Hyrule Is this a meme?

The reason this bug exists at all is due to the programmer not thinking anyone would ever max out the machine and reaching the 256th level. And because of that, he never tested his 8-bit code for that contingency. At least now people can burn a fixed eprom for this problem if they so choose.

@Asterra2

6 жыл бұрын

There's a fix for Ms. Pac-Man's (rather more involved) kill screen as well. Gotta be impressed when people find a way to shove a bugfix into the tiny bit of rom used by a 35 year old game.

@keiyakins

6 жыл бұрын

In this case wouldn't it just be a reordering? At the start of the level, draw the fruits, then the maze. Then leave them (as I assume the maze is being done already for the dots' sake) until the next new level.

@Thefuryspeed100

6 жыл бұрын

Probably somebody did realized this back then, but the team said "Nahh, they wont get past level 255" and so it wasn't worth fixing it

@NintendoSunnyDee

6 жыл бұрын

Asterra2 Is there a video explaining Ms Pac Man's?

@ghost_ship_supreme

6 жыл бұрын

It was originally designed for arcade cabinets right? They probably thought no one would ever stand there for ~3 hours doing it, not getting bored, and not loosing once...

Fascinating. Extremely well done video!

@thegamingchannel7110

4 ай бұрын

are you gonna speedrun Pacman?!?

though, imagine being the first guy to reach 256 "Hey, what happened to my game???"

@marcohueber5130

4 жыл бұрын

It would be scary

@lillithemew3587

4 жыл бұрын

I'd be to scared to play the level

@arfansthename

4 жыл бұрын

Bill Bastable would've felt relieved.

@Randompersononline

3 жыл бұрын

@HitWalkHook I think that the first person to get there actually sent a picture of it to the devs.

@daveyfromdownsouth7889

3 жыл бұрын

That would be Billy Mitchel. First man ever to beat Pac-Man and get a perfect score

I love how people think glitches as something that’s wrong with the game, but that far from the truth. The game continues to try and do its job even when one thing is out of place, making an almost always entertaining mess. Great video as always mate, look forward to the next one.

@ShaunDreclin

6 жыл бұрын

Yep this is a good example of computers doing *exactly* what they're told to do, even if it doesn't make any sense

@renakunisaki

6 жыл бұрын

1980s error handling: "what error?"

@vuurniacsquarewave5091

6 жыл бұрын

Yep, it's perfectly possible to add a special exception to prevent the level counter byte from ever being 255, but it's not worth wasting those extra bytes when your ROM space is limited.

@joeclifford2896

6 жыл бұрын

VuurniacSquarewave well in the later Pac-Man machines, they introduced a bored which if someone did get to level 255+ an integer overflow would occur. Just like donkey kong, nibbler and countless other games.

@XaneMyers

6 жыл бұрын

If only computers nowadays handled errors and giltches like this instead of protecting memory and throwing an error message up then quitting.

"now let's get into the more technical stuff" But I haven't understood anything said so far.

@imissjokesonpurpose

4 жыл бұрын

Lol

@peterp2153

4 жыл бұрын

Heh heh. Know what you mean. That said, just using my brain for a general understanding of the matter, it essentially has to to do with the limitations of the coding based on the data available to write coding that basically equates to “if x then y”. 255 being the maximum number, once you hit 256, those “if x then y” formulas start to make no sense. Or another way to look at it, the algorithmic coding of the day allowed for 255 levels of fun gameplay, which was more than enough for 99.99999% of the arcade visiting public. Which was more than enough to compensate for the fuckery that starts when you roll over to Level 256 (aka Level 0).

@arfansthename

4 жыл бұрын

I have.

@thepianokid9378

3 жыл бұрын

DenkyMan then does that mean that you did not understand “seven”?

@fierymoth4330

4 ай бұрын

Frr

There is an endless version of Pac-Man Called ‘Pac-Man 256’. It’s an app where you are in an endless Pac-Man with a scrolling screen being chased by glitches. I always wonder why the number 256. It all makes sense now...

@lisacamarillo8744

5 жыл бұрын

its basically crossy road

@thisissaah_3536

5 жыл бұрын

@@lisacamarillo8744 but PACMAN. 256 pacman. Even the teaser says it's inspired by the 256th level. Unless you knew that.

@Flarefin

4 жыл бұрын

@@lisacamarillo8744 So basically Frogger

@lokyinng5155

4 жыл бұрын

if pac man 256 level kill screen land move dot are lower

@sigmythesign3509

4 жыл бұрын

@@thisissaah_3536 *Pac-Man

This is actually a lot easier to understand than I had expected.

@imissjokesonpurpose

4 жыл бұрын

Liar

@torin1006

4 жыл бұрын

@@imissjokesonpurpose no u

@imissjokesonpurpose

4 жыл бұрын

@@torin1006 uno reverse card

@torin1006

4 жыл бұрын

@@imissjokesonpurpose You've activated my trap card! Your reverse card got sent to the shadow realm.

@mateuszszulecki5206

3 жыл бұрын

@@torin1006 *ye well ur mom got sent to the shadow realm becuz of me*

Dig-Dug has a kill screen which also happens at Level 256! The level layouts vary in Dig-Dug, however, so "Level 0" loads garbage level data, placing an enemy right on top of the player.

@IbiActive

6 жыл бұрын

Same happens with mario vs donkey kong arcade lvl 22

@locutus442

6 жыл бұрын

There's also a kill screen in Galaga, but it's effects can vary depending on the difficulty setting (some machines will load a normal level, while in others the game will crash).

@SpearM3064

6 жыл бұрын

+Another Anime lover Unlike Dig-Dug or Pac-Man, however, Donkey Kong does not have a glitched screen at level 22. Rather, it has a glitched timer that doesn't even give you enough time to get past the 2nd girder. It's another integer overflow. The timer is calculated by taking the level number times 10, plus 40. There is a check at the end of the code to prevent the timer from exceeding 80. If the level number is stored in B, and the timer is in A, then this would be the equivalent code in BASIC (I'm translating to BASIC for anyone reading this who isn't familiar with Z80 programming) A=B : REM Set the Accumulator to the level number A=A*2 : REM The Accumulator is now twice the level number A=A*2 : REM ... and now it's four times the level number A=A*2 : REM ... eight times the level number A=A+B : REM ... nine times the level number A=A+B : REM ... ten times the level number A=A+40 : REM and now A=B*10+40 as intended IF A>80 THEN A=80 Note that the *only* error checking is done *after* the math. The problem is that A is an 8-bit number, so it can only hold a value between 0 and 255. So what happens when you hit level 22? (22*10)+40=260, so A wraps around to (260-256)=4. Since 4 is less than 80, the error checking doesn't catch the problem, and you start level 22 with a timer of 400. The unusual thing here is that the game checks the level to make sure that if you ever get past level 100, it forces it back down to level 99. So they *did* anticipate that players could make it to level 100, but somehow they overlooked the timer bug, and you can't get past level 22 without patching the ROM. What was *supposed* to happen is that if you are on level 4 or higher, the timer will always start at 8000 (which is the reason for the IF A>80 THEN A=80 at the end). The patch is simple and fits in the existing space. You just add an error check before the math, and remove the IF statement at the end. A=B IF A>=4 THEN A=4 (everything else is the same, but remove the IF A>80 at the end)

@windsofmarchjourneyperrytr2823

5 жыл бұрын

@@SpearM3064 not sure if you're really smart, or just a huge geek, lol

@servantofaeie1569

5 жыл бұрын

FairPlay137 minecraft limits at 256 too

Can I just say, aside from being really interesting and well-articulated, your videos are *very* aesthetically pleasing. The way everything is laid out and animated is just on point. You need to be in web/app design or gaming or something lol

A great explanation of the Pac-Man Kill screen! I never knew what was going on, but now it makes a whole load of sense! Thanks for making another great video!

Okay, I have a theory I'd like you to try out if you can... These pellets return on a respawn, yes? Simple, can we hack in Infinite Lives and continue to eat those respawning pellets to reach the 244 pellet counter, and then see what happens?

@RGMechEx

6 жыл бұрын

I did this while recording the gameplay footage--you go back to level 1 (just a cherry), but the enemy difficulty still behaves as if you were on level 257 (fast ghosts and they don't turn blue when you eat a power pellet).

@Zeiru

6 жыл бұрын

Thank you! That's kind of what I suspected would happen (since the only variable causing an issue here is the level icon) but it's wonderful to have it confirmed. I wonder if a ROM hack could be made that adjusted for this, or if one already exists...

@XaneMyers

6 жыл бұрын

Interesting, but why do the ghosts stay at faster speeds? I assume a second variable has to be responsible for that if it isn't the level number variable.

@7thDylan

6 жыл бұрын

Chris Waegelein

@Cube8

6 жыл бұрын

What? The ghost speed variable is 16-bit???

Probably one of the scariest, most influential computational bugs of all time. Today this kind of glitches are treated as "The system doesn't know what to do so it just throws in random shit and colors", but this is so painfully logical that I don't even know how to feel, it makes too much sense and I literally can't think what would've happened if it were any other way. Fascinating.

Excellent video. Like that you put in the work to reverse engineer the exact output of level 256 instead of just leaving it at "register overflow"

this was perfectly executed! flawless video!

@Kapin05

4 жыл бұрын

Ironic, as it's a video about the game being imperfectly executed

Loved this!

@smashfanx7560

3 жыл бұрын

**turns around**

@gdhjhugtrfedghnjg

3 жыл бұрын

@@smashfanx7560 r/madlads

@DontTurnAround

3 жыл бұрын

@Spirit Creeper 40 Thanks!

This is so well made and explained, keep it up!

I've known the specifics of this glitch for years now, but never seen a video on the specifics. Really nice to see one, finally. Hoping to see some for games like Galaga and Dig Dug in the future. :)

@Qtheman3456

6 жыл бұрын

Galaga and Dig Dug? You wouldn't happen to have read Don Hodges' old website posts about this stuff, would you?

@SuperViperT302

6 жыл бұрын

Yep.

0:07 Ah, the *256 Glitch.* I love how both Bandai Namco and Hipster Whale teamed up to make *"Pac-Man 256",* a game that's literally based on the 256 Glitch. It's incredible.....

@hotpockethumorDL

Ай бұрын

if only Nintendo did the same...

Awesome technical breakdown of what happens. The "glitch" is actually very ordered, and your explanation makes a lot of sense. What software are you you using to create your animations within the video? Very nicely done!

@timothymclean

6 жыл бұрын

Everything computers do is ordered. It's just that some happen to ruin the intended function. (Technically, everything everything does is ordered, thanks to the laws of physics.)

@ender_scythe2879

6 жыл бұрын

It's still a glitch, an unintended consequence of an oversight is still unintended.

@Pablo-V

6 жыл бұрын

I think that by order the OP meant “in order”, not “giving an order”

@RGMechEx

6 жыл бұрын

I use After Effects for pretty much all of the animations.

@anthonylosego

6 жыл бұрын

Retro Game Mechanics Explained you sound familiar...

One thing I would love if you did, was deconstruct the "Hidden World" in The Guardian Legend. Though, such a project would be freaking huge I suspect. It's a NES game that uses a map coordinate system, and if you use the password system to spawn yourself outside of the intended map, the game starts creating rooms using random data in the ROM and you get lots of glitchy messes (a lot of which will crash the game). It would be interesting to see what is going on in the game's RAM, and such. But I suspect that would be a huge project to analyze all that data...

@RoddyDev

5 жыл бұрын

I'd love to see that.

That animation running through the code and drawing the glitch is one of my favourite things to watch on this channel.

That transition at 10:46 is GOD-TIER HOLY MOLY

9:32 So much hard work OMG

@b3kstudio

6 жыл бұрын

Hopefully he used a script... Hopefully

@XaneMyers

6 жыл бұрын

I think I recall reading he uses scripts in After Effects to show technical things within the videos.

@hopechr

5 жыл бұрын

9:44 draws a pac-ler

Beautifully explained! Even in the 1980's I figured that it was something like this happening. I was just starting to learn computer programming and figured is was like a stack overflow, but that didn't make much since either because in a stack loss, there is data loss which usually means a fatal error then crash, but here it does a type of flip flop but using current running data to overlay old data the not used anymore as it was just needed once to load and draw the game screen values for initial game play. Great work!

I love how well you explained this. I’m very unfamiliar with how memory addresses and all that kind of stuff work, and you made it all easy to understand. Love this

This doesn't relate to anything important in the video, but "Dave Race" is a great name for a speedrunner.

@rickelmonoggin

3 жыл бұрын

I wonder what his fans are called?

Finally someone that doesn't uses the excuse "There was not enough space left left for the other half"

What a spectacular video! Full of engineering data, retro game data, nostalgia, and some of the best and most descriptive infographics I've ever seen on KZread! Absolutely to notch -- thanks for your efforts! 💯

Thank you so much for these videos! I've been coding a retro-style video game for years now as a hobby, and understanding some of the mechanics behind these games helps a LOT with inspiration and development. Thanks again!

This is my favorite video of yours so far. Excellently detailed explanation - thank you!

Impressive video, you definitely did your homework on the subject and presented the info perfectly. A++

@MeNotTadget

3 жыл бұрын

Nah, A+++

Your channel is extremely well detailed and polished. Nobody else comes even close!

@SONICBUMGAMES

5 жыл бұрын

Acoha This is guy is fantastic! Have you ever heard of RetroAhoy? His videos are great too c:

Wow, this explanation was incredible. Thanks for going into so much detail and graphically showing everything that was happening!

A perfect and complete description yet again. I’m glad to see you making videos again.

I love your explanations. There's always that "aha" moment where it makes complete sense. Awesome!

awesome explanation as always!

I just love your detailed in-depth explanations. Thanks so much for sharing. 😎👌🏼

Great video. I always know I can expect quality information and entertainment when I see RGME in my feed.

I heard a large prize was offered for anyone who could complete level 256 the way it was but it was never claimed.

"Now let's take a look at the more technical stuff." Me: Ok, I wanna see if I can understand this part. *big numbers and strange images* Me: *I FAILED MATHS FOR A REASON*

This was very educational, and the first of your videos I found. Time to check out more.

Thanks God I've found your videos, they are amazing and those all animations are so cool that I am still impressed by them! Hats off!

And that, my friends, is why you use zero indexing.

@fredhenry101

5 жыл бұрын

And bounds checking

i really appreciate the technical accuracy but also the smooth animation

Very good presentation. I am even more impressed about your presentation here, than about the topic itself (which is very interesting).

That was a great video, fantastic explanation to something I was curious about!

Saw this video, thought "oh I know what causes that." Well I was wrong. Great video, as always! :)

@MarioFan587YT

6 жыл бұрын

Mezgrman Aw, you should have told us what you thought. I'm interested.

@urchin62

5 жыл бұрын

Glad u like it, I did

@SSM24_

5 жыл бұрын

Yeah that was exactly my thought. "It's because reaching level 256 rolls over the counter and screws things up, right?" Yes, that is in fact what happens, but it doesn't tell anywhere close to the full story.

@user-ru4kb2ri1b

4 жыл бұрын

WHAT WHERE YOU THINKING A YEAR LATER!?!???

Man, old school game glitches are cool like that. I kinda wish more modern games would try to replicate systems like that prone to actual fun glitches if everything's not coded or managed correctly.

@moth.monster

6 жыл бұрын

Actually, it's very easy to do this: just don't add a crash handler. Problem is, then you can have bad shit happen on modern PCs and stuff.

@thetoontastictoon1720

6 жыл бұрын

tbh I wouldn't like that very much, I always found kill screens startling, I don't like seeing games suddenly spazz out in weird and unexpected ways, it hurts my eyes and gives me the fright of my life

@theobserver4214

6 жыл бұрын

Elven Insanity The modern equivalent are engine bugs/flaws. Want a modern example? In Call of Duty 4:Modern Warfare, if your computer runs the game fast enough (Either 125, 250, or 333 frames per second), the game calculates physics wrong, letting you jump higher, reload, and move faster. Another is a more classic example. In Quake 1, running and jumping on slopes surfaces influence your momentum, meaning that high enough ramps you can run up and jump from will send you very high

@arielsproul8811

5 жыл бұрын

a lot of source games like portal or half life have backwards jump speed glitches, similar to the BJLs in super Mario 64

@3lH4ck3rC0mf0r7

5 жыл бұрын

Another framerate-related problem: If you hack Super Mario Sunshine to run at 120FPS, you can't enter level portals! There's also the all-too-common state machine glitches and animation engine and physics errors in modern games. And SM64's parallel universes

Thanks for doing such an in depth explanation !

Thankyou Game Grumps for bringing me here, and thank YOU, RGME for enlightening me and explaining so well. This is kinda rad.

The way this is also animated, it makes it SO much more awesome! What about Ms.Pac-Man and the upside-down maze?

0:40 That's what the fruits meant? I was always so confused! I was thinking maybe they were fruits that I gathered, but they clearly weren't!

Thanks for the video, it was really cool, entertaining and informative. I *LOVED* it!

Your videos are amazingly well produced and explained. They must take ages to edit. Fantastic work. Also btw there’s something about your voice that i find extremely soothing.

"I got all the patterns down...up until the 9th key." -- Buckner & Garcia, Pac-Man Fever

@raygordonteacheschess5501

3 жыл бұрын

My 9th-key pattern had me go through the PacMen to impress chicks.

@LyfaLeeZhure_DavidShawn

2 жыл бұрын

13th key, Pac slows way down to "start level speed", while the ghosts are all faster than Pac (not just Blinky). Tough. I think the furthest I've ever made it is 15th key...apparently I'll never see the "kill screen".

i thought the galaxians were lemon flavored ice cream sundaes

@somerandomguy6268

3 жыл бұрын

Me & my dad call them sundaes, and we thought the bell was a gold nugget lol

As usual, extremely well put together and easy to follow (even though the subject matter can be complicated). Nicely done! How about a "behind the scenes" video on how you put these together?

i still have no clue what you are explaining but i just cant stop watching, you are keeping my interest pretty well.

I've wanted this forever. Can you do something similar with other kill screens?

They should have just treated the level number as zero based instead of one based and then integer overflow would just take you back to level one instead of level zero.

@groszak1

6 жыл бұрын

With adding 1: actual 0 -> shown 1 actual 1 -> shown 2 ... actual 254 -> shown 255 actual 255 -> shown 0 Without adding 1: actual 0 actual 1 ... actual 254 actual 255 actual 0 (back where we started) ... They chose the former one, because they didn't think about overflow and they wanted to start with 1.

Dude, I love this explanation. I was really hoping for something more detailed than 'garbage data' or 'glitchy graphics' or something along those lines, and you really delivered.

Awesome explanation and superb visuals. You, good sir, are a wizard.

This is kinda creepy. Imagine if this was real life and half of the world was just a glitchy mess.

@diacosiapentacontahex

4 жыл бұрын

This is why we die faster at larger age numbers, the world is trying to stop us from getting to age 256 and glitch out half the universe

@Brainrot_content_is_cringe_af

3 жыл бұрын

R.I.P Japan, Created Nintendo And Was 256 Years Old

I'm never this early to your vids so I never get a chance to ask you anything. What I wanted to ask, is actually a suggestion: take a small break between talking and showing something. If you do both at the same time, people can't focus on both things simultaneously. A good example is at 6:09: you are showing the different valid memory positions for the fruit while explaning the consequences of accessing wrong memory addresses. Like with a slideshow presentation, if people are focusing on the visuals, they won't pay attention to what you are saying. Explain something, stop talking while showing a visual example of the explanation and then continue with the next explanation. Anyway, thanks for another nice upload.

@RGMechEx

6 жыл бұрын

Thank you, I'll consider it for future videos!

I remember reading a website by Don Hodges years ago explaining many arcade kill screens in Pac Man and Donkey Kong, and how to patch them. Nice to see a video explain Pac Man's kill screen with visual aids easy to understand.

Very interesting and explained very well! Looking forward to more

"There are pellets that respawn after you die" People with infinite lives cheat: *interesting...*

@NoriMori1992

2 жыл бұрын

If you do that, I wonder what happens when you reach level 257…

@mouykaing7456

2 жыл бұрын

@@NoriMori1992 You probably go back to level 1

@gordontaylor2815

2 жыл бұрын

@@NoriMori1992 You just go back to Level 1, but the game is still at its maximum difficulty. (You don't even need to cheat to prove this - use the "rack advance" feature either in MAME or an actual arcade machine to see it.)

Excellent Video. And thus, Namco and Hipster Whale made a game called Pac Man 256, and this game was inspired by 256th level kill screen. 👍

@bruhmoment6706

5 жыл бұрын

CHAKA24 I played it

Wow this was very informative! Thank you so much :)

Wow, thats incredible! Great work man!

5:41 - "Now let's get into the more technical stuff" - Yes, because all that stuff before was so easy! :D

Does the stage only render once? The pellets are obviously restored, but the walls never change, so... Would it "fix" the glitch if drawing the new pellets on-screen only happened after the level counter has been drawn? Sure, the stage walls would become corrupted, but hey, it's better than nothing!

Probably the best description of a video game glitch I have ever seen. Thanks!

wow, I really liked the video, i definitely learned something new! Thanks and keep up the good work!

I was the 256th like on my screen. So happy lol

@MarioFanGamer659

6 жыл бұрын

*0th

@SamuelLing

5 жыл бұрын

There's zero likes, you are too early

@suwinkhamchaiwong8382

5 жыл бұрын

MarioFanGamer r/woosh

@carrotcommunist9216

5 жыл бұрын

Suwin Khamchaiwong r/woosh x2

@edwardrocca

5 жыл бұрын

even better, this comment has 64 likes at the time of me viewing it

This explanation is foolproof

@Dargonhuman

6 жыл бұрын

I am the fool, they have the proof.

@RyanFaeScotland

6 жыл бұрын

For now perhaps, but the world is constantly making better fools.

You put so much effort into these videos. I can't even begin to imagine how painstaking it must be to do something like this. Could you maybe make a video explaining how you animate your videos? That would be super interesting to watch!!!

This video is very well done, excellent job!

"we have to take a look at th- *ad plays* "

This was a cameo on crossy road(if you play as pac chicken or Pacman) and Pacman 256

Thank you, You explained it very clearly, Subscribed!, keep up the good work 😊👍

Outstanding explanation. Well done!

Luv ya dots!

@windsofmarchjourneyperrytr2823

5 жыл бұрын

I find it interesting that the simple 8 bit stuff sucked up.WAY WAY more hours than way more advanced games that came later. At least for me...

Wish I had $4000 or $4400.

@newagederpderp

5 жыл бұрын

'Course you do.

@RodBeauvex

5 жыл бұрын

I wish I had $FFFF

@vegetafan9922

5 жыл бұрын

@@RodBeauvex When you're so broke that you cause an interger overflow in your bank account!

@ariescobar1346

5 жыл бұрын

Wouldn't you being poor cause an integer *under* flow?

@thisissaah_3536

5 жыл бұрын

@@RodBeauvex $6666 is what you meant? F=6

I stumble upon this video out of pure coincidence and now my mind is blown... I love how you explain stuff

Very simple to understand video 😄 good Job!

If you could get enough lives to get past level 256, aka you can collect the extra pellets generated by the glitch enough times to clear the level, I'm guessing you would be back at level 1 and could continue the game all the way to level 256 again, at which point I'd think you're now actually out of lives. What would the highest pacman score be in this scenario?

Awesome explanation as usual! Thanks! But a related curiosity pops up in my mind. When you add 255+1 in this 8-bit system, the 8-bit memory backwards to 0. Ok I understood. _But when 255+1 are computed, does the CPU increase 1 on his neighbor memory address? Or not?_ If somebody knows it, please feel free to comment.

@FIX97

6 жыл бұрын

if the instruction used to increase that number was an 8-bit add instruction then no, it will only set a CPU flag to let the CPU know that an overflow occurred and write back that 8-bit value, there are 16-bit add instructions as well on 8-bit CPUs but in this case this does not appear to have been used, it would've worked up to level 65536 otherwise.

@Sauraen

6 жыл бұрын

The other answers are right. It's incrementing the value in a register, so the register becomes zero and the carry or overflow flag is set. Since the program wasn't intended to handle this, it just ignores this value and moves on.

@VictorCampos87

6 жыл бұрын

Yeah. As a programmer i realised that incrementing the neighboring byte in CPU will only cause problems if the code isn't prepared/planned for that. But all this 3 comments above killed my curiosity like a charm. Thanks you all!

@DavidRomigJr

6 жыл бұрын

Most CPUs I know of perform an Add With Carry. Both numbers are added together along with a Carry Flag and the result is stored and Carry Flag set to the extra bit (and perhaps an Overflow Flag if it has it). So if you start with a cleared Carry Flag, you can add any bit length you want by constantly pulling values from and storing values to memory, but it's up to you to chain the calculation in code. But whenever you stop, that's where the value will wrap. Back then ROM and especially RAM was at a premium price, so you could have a 16 bit level counter but it'd be a waste of money and I doubt they ever expected users to crack a hundred levels let alone 256. If it weren't for the level counter display bug, you could play indefinitely, wrapping back to level 1 after 256.

@crimsun7186

6 жыл бұрын

This is something that Bisqwit mentions in one of his "Cracking Video Game Passwords" videos, where one of the games uses 128-bit integers and he has to work out a way to deal with those in C++, which only supports a maximum of 64 bits for integers.

Very nicely explained! I already understood about the 8bit limit, but never really gave much thought as to why there was that mess on the left side of the map.

These videos are immensely fascinating. Who would’ve guessed a simple game like Pac Man would have so much depth to it?

You know what's kinda funny? if they'd drawn the level AFTER the level counter, there wouldn't have been a problem: the status line would be corrupted and the level area would have junk on it, but then that junk would be overwritten with the map that's supposed to be there and everyone could go on their merry way going to level '1' next.

@thetoontastictoon1720

6 жыл бұрын

Wow, I just realized you're right. Wow. That's truly amazing right there---

Damn. This is really, really cool.

I'm pretty sure this is the first video i saw from you. And i was immediately hooked

Thanks for this great video. So much appreciated