
I have Mortal Kombat version 4.0, Mortal Kombat 2 version Challenger, Ultimate version 2.1 and Mortal Kombat 4 version 3 using the multi-jamma set up. Here is an list of PCB ROM revisions and features as they were released into the arcades. I wanted to have the latest versions of ROMs to get the most complete game possible. This info came in handy when browsing for a particular pcb on eBay. This is no way considered a complete definitive listing and is more or less interesting info. The main versions as opposed to beta versions were the ones that most people have played.
Click on the marquee's to see the differences between the ROM's.
Version 1.0 First release of Mortal KombatIn two-player game, both players could not choose the same playerLiu Kang had Uppercut - Flying Kick ComboVersion 2.0 More blood addedBoth players could choose the same playerNew Shang Tsung death animation addedMerchandise promo addedVersion 3.0 Computer IA increasedReptile added Version 3.1 Turbo This board can be identified by a daughter board and additional ROM’s (U89 &U105)Faster GameplayMore JugglingSub-Zero had levitating freeze – Frozen opponents floated to top of screenReptile appears more often Version 4.0 Reptile clues addedSonya could fight Reptile; Block allowed during fatalityGoro's theme played during all of Endurance Three Proto 9.0Earlier version of MKSimilar to 1.0Goro can’t be knocked down with uppercutBuggier versionCharacters in mirror match are same color (not darker)Nifty Kombo
Another early version of MKGoro can’t be knocked down with uppercutDifferent writing in attract mode Version 5.0 T-Unit Board
Official Midway game boardBetter hardwareSame board used in NBA Jam and MK2More bugs fixedRewind to the top
Version 1.1
First version released to the public even though unfinished This version contained almost all moves and approximately 9 fatalitiesKintaro and Shao Kahn nearly impossible to defeat without cheating Shao Kahn could only be killed by throwing missile weapons)No ending storiesBaraka's blade fury has no soundShang Tsung could walk on the ceiling Version 1.4 Mileena's roll move addedKung Lao's flying kick addedSub-Zero could do the first part of Fatality #1 during the matchDanger indicator added Version v2.1 "Baby Basher" Earlier version of MKIIBabality glitch allows multiple babalities and friendships to be performedMultiple babalities would crash the gameBaraka could use blades on baby and crash the gameFirst 'official' release versionIntro text slightly changed Ending stories and credits addedDan 'Toasty' Forden's face addedComputer intelligence increasedAlmost all fatalities addedFriendships and babalities addedPit 2/Tomb fatality addedSmoke and Jade were addedKintaro and Shao Kahn were easier to defeatKintaro and Shao Kahn could be defeated by keeping them up in the corner with repeated punches
Shang Tsung's repeated flaming skull move fixedReptile's slide addedDoing Shang Tsung's soul stealing fatality against Jax could sometimes crash the game Version 3.1 More blood addedDead Pool fatality addedNoob Saibot addedRaiden's uppercut fatality addedKung Lao's friendship addedComputer intelligence increasedComputer can do missile weapons in mid airBabality/Friendship problem fixedRepeated punches in the corner fixedKitana's multiple fan lifts in the corner fixe.Sub-Zero's freeze - punch - freeze - punch...fixedScorpion's spear - uppercut - spear - uppercut...fixedPictures of the creators added after the creditsRevolution X and DCS ads addedComic and CD offer shows picture of CD Version 4.2 Not a widly releasedFaster uppercutsJohnny Cage had full time red shadowFight Noob Saibot after only 6 winsPlay Pong soonerMixed ladderMultiple dead pool fatalitiesVersion 9.1Extremly Rare version of MKII
Play Pong after 12 wins
Play Jade after 4 wins
Play Noob Saibot after 6 wins
Jax has faster face smash
Johhny Cage has full time red shadow
Multiple dead pool fatalities
Version - ChallengerSometimes called Immortal Kombat chipset More difficult fight ladder Mltiple Dead Pool Fatalities where you can punch the opponent out of the acid and make them stick in the air (and just a normal uppercut will knock them in the acid to begin with) Johnny Cage has full time red shadow Al of the secret characters can appear on the fight ladderExtended fatality timePay Pong a lot soonerUppercuts are fasterJax has a faster face smashRewind to the top

Prototype 4.0 AAMA warning in blackShao Kahn just falls over when defeatedNo ending creditsComputer only does combos for finishing movesMotaro could be frozen by Sub-ZeroMotaro and Shao Kahn turn white when frozen
Version 1.0 AAMA warning in black and blueSindel, Kabal, Cyrax, and Sektor's Animalities addedKano's fatalities have been changedGalaxian game addedVs. codes hve been changedWinning streak addedUltimate code addedSubway and Shao Kahn Tower fatalities addedCredits listedPerforming Kabal's animality without a mercy resets the game, Computer does fatalitiesMotaro could be frozen by Sub-ZeroVersion 2.0
Computer intelligence increasedMain Story Plot addedMore blood added, Finishing moves have been changed Characters with unchanged finishing moves: Stryker, Kung Lao, Sindel, Kabal's screamer, Babalities added, Friendships addedCombos alteredShao Kahn's death alteredMovie Promo addedAntony Espindola included in the creditsSub-Zero can no longer freeze MotaroSmoke's finishing moves addedShao Khan looks normal when frozen, instead of whiteVersion 2.1
Computer intelligence increasedDamage on some combos lowered (Sub-Zero, Kabal)Free credit trick taken outSmoke stays in memory after UKC is entered. (Smoke will be erased in earlier versions should the game reset to factory default settings.), Cyrax's double fatality glitch removedRewind to the top
Beta Version 1 The special "Road Tour" version of MK49 Playable Characters: Sub-Zero, Scorpion, Sonya, Liu Kang, Shinnok, Fujin, Rayden, Noob Saibot, and Quan Chi6 empty spaces in character select screenAuto-Combo's are in the game. Usually some easy combinations like 4 High Punches.Timer was stuck at "99" the entire matchNo 1-player mode. 1-on-1 playing onlyNoob Saibot, Shinnok, and Quan Chi didn't have any moves or weapons in this versionSub-Zero's Ice Freeze and Clone effects not yet implementedMany glitches in game play, sounds and graphics.The game crashed or reset itself on average every 10 minutes Moves are extremely glitchy in the corner Beta Version 2 Kai and Reptile are now selectable."Hidden" and "Random" buttons on Select Screen now workYou can now fight against each other with the same character without the game locking up, however the corner glitches and camera problems continue.The Game Counter now works.The "Wins" Counter still doesn't work, however there is a "Top 20 Wins List".Sub-Zero's freeze and clone effects now work correctlyKai's name isn't on his powerbar, and his name isn't announcedShinnok and Fujin get new select screen picturesNoob Saibot, Quan Chi, Reptile, and Shinnok still have nomoves or weapons.Kai has one move where he stands on his handsStill no 1-player mode (1-on-1 fighting only) Beta Version 2.1 Small upgrade that simply fixed a few bugs in Beta Version Beta Version 3 Tanya is now selectableAuto-Combos removedShinnok's Impersonation moves added.Shinnok get a bladed staff, Quan Chi gets a straight edged sword, Tanya gets Sonya's spinning bladed wheelReptile and Noob Saibot still don't have any weaponsQuan Chi gets a new Green Skull move1-Player mode now availableThe "Choose Your Destiny" screen moves in full 3-D.Reptile and Shinnok still don't have moves.Tanya has one move, an air fireball.Kai now has a leg spin along with the leg grab when he gets into his handstand stance.More bugs fixedSelect screen switched around. Kai and Reptile are on top, and bottom row is moved around Beta Version 4 Tanya gets her fireballs, Kai gets his fireballs,Quan Chi gets new moves, Shinnok's Impersonations addedReptile gets new moves Noob Saibot gets a teleportand slam, and a few other new moves for various characters"The Living Forest" and "The Prison" background stages added.More bugs fixed, however the camera glitches and lockupscontinue to be a problemNoob Saibot gets a spiked club Beta Version 5 Jarek replaces Noob Saibot on the Select ScreenJarek has 2 moves, a Cannonball and a Telekinetic SlamLots of weapon changes. Kai and Reptile both have Shinnok's staff, Jerek has Rayden’s hammer and Sub-Zero no longer has his axe. Instead, he hassome type of sword.No Boss, No Character Profiles, No EndingPrison Stage Fatality addedIntroduction Storyline with Raiden added, without speech Version 1.0 First OFFICIAL Release of MK4Raiden's introductory speech addedOnly 2 Fatalities in this Version: Sub-Zero's Spine Rip and Shinnok's Leg Rip, where he first must impersonate Sub-Zero, then do the same movement as Sub-Zero's Spine Rip. This may have been an error on the part of the Design TeamPrison Stage Fatality movements for most characters addedCamera lock-ups and glitches continue to be a problem Version 1.44 1st Beta Test of the Official Release, Version 2.0Tested in Chicago only. The 3 Question Marks in the middle of the screen are nowtaken by Johnny Cage, Jax, and Noob SaibotInteractive Background feature added: Scattered rocks in Goro's Lair and Decapitated Heads in the furnace stages that the players can pick up and throw at each other3-D Sidestep added, which gives the player the ability to "sidestep" projectiles by pressing D+RUN Computer AI increasedSub-Zero has a "Freeze Wand" for a weapon, with which he can freeze you. If your opponent picks
it up, he can freeze you back"Danger" added (when you only have a sliver of life left)Character Introduction Biographies added, however still no endingsShinnok is at the top of every tower, which denotes him as the final bossVS. Screen Added, Complete with VS. Screen CodesCharacters can now throw and drop their weaponsSub-Zero's Spine Rip from Version 1.0 doesn't seem to work in this version. Version 1.72 2nd Beta Test of the Official Release, Version 2.0Tested in Chicago only "Reiko" takes the place of Noob Saibot on the select screen.Endings have been added for everyone but ReikoRaiden now has electricity flowing effects around himIt happens more often than it did in MK1Sub-Zero's Spine Rip has been enabled again A red stripe has been added to his face, which denotes that he's the Sub-Zero from MK3/UMK3.
Sub-Zero can no longer freeze you with his freeze wand after a breaker move.Scorpion has his "Fire Breath" move, where he takes off his mask and breathes a stream of fire straight out
Tanya has a boomerang for a weaponJax and Johnny Cage both have fireballs nowJax has his Quad-Throw addedShinnok has a Reiko ImpersonationJarek has a new fireball, different from his previous oneA lot of things added to the Attract Mode, like an ad for MKMythologies and a "Powered By: Zeus" ad.The game uses a new font for everything but the power bars, just like it was in MK3/UMK3.
The MAXIMUM DAMAGE system added, which prevents you from doing any combo over 40%in damage.
The computer draws, uses, throws, and picks up weapons quite effectively now.Alternate Color/Clothing system added, where you can do a certain button combination to change the color scheme of your character. Instead of the
characters being direct palette (color) swaps as it was in MK3/UMK3, the
characters now have small differences in their clothing. For example, Sub-Zero
can either have his mask on or off; Liu Kang can either have his shirt on or off, ect. Version 2.0 Second OFFICIAL release of MK4 Reiko's Ending FinishedMany more Fatalities AddedBasically the same as Version 1.72 Just a few bug fixeshere and there Version 2.1 Exactly the same as Version 2.0 The only thing fixed was a nasty CPU bug which was making the computer extremely easy to beatand even allowing someone to control the computer with the second controller. This was
causing arcades to lose revenue, because the game was so easy that you could beat it within
minutes to see the endings, then never play it again.
Version 3.0 A 2nd Fatality for every characterStage Fatality added to Goro's Lair where you uppercut them into spikes. Requires a different movement than the Prison Stage Fatality
Spiked balls added to the floors of the Purple Stage for throwingMost bugs have been fixed, however camera flaws still exist, especially in the Purple StageMore Kombat Kodes addedNew weapon for Johnny CageFatality "Demo" added at the beginning of the game. It shows fatalities being performed, and just before any killing is done, it fades to black and the "Fatality" sign appears.More breakers have been added and switched aroundThere was a glitch in Version 2.92 (A beta of Version 3.0) where if you choose the 2-on-2 Kombatthen each player chose either Sub-Zero or Scorpion as 1 of their 2 characters, when the match
began, one of each player's characters would be a bloody corpse! The skeletons would fight
each other. Remark "Meat Lives" made on Ed Boon's MK4 Page
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