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Mega Man X SA1

Hack of Mega Man X


SA-1 is a co-processor present in some SNES games. Being roughly four times faster than the main CPU it can significantly improve a game’s performance and that is the purpose of this hack, to remove slowdowns present in the original Mega Man X.

Other changes include:

  • Leg Dash defaulted to the L button.
  • Generated passwords are saved into SRAM
  • Control scheme saved into SRAM.
  • Subtanks stop depleting at full health.
  • Disabled double-tap to dash.(optional)


  • mmxsa1.ips
  • mmxsa1_double_tap_disabled.ips

Besides zsnes, it should run on all emulators.

Rom disassembled with:

SA1 code based on:

ver. 1.2:

  • Disabled double-tap to dash made into a separate patch.
  • Fixed Chill Penguin’s frozen statues collision.
  • Fixed C. Sting palette effects.
  • Fixed graphical glitch on sea and sky stages.
  • Fixed the amount of health provided by Subtanks.
  • Control scheme saved into SRAM.

ROM / ISO Information:

  • Database match: Mega Man X (USA)
  • Database: No-Intro: Super Nintendo Entertainment System (v. 20180813-062835)
  • File/ROM SHA-1: 449A00631208FBCC8D58209E66D0D488674B7FB1
  • File/ROM CRC32: 1033EBA4



RHDN Hack Image


ContributorType of contributionListed credit

User Review Information

An X-cellent must-have hack for MMX (+ a disclaimer for flash cart users)

Reviewed By: tsubasaplayer16 on 02 Feb 2023

This hack works and really does remove the slowdown. You can see it when the demo plays out. Having your generated password get saved after you turn your console off and other configurations saved is really nice too, it saves the tedium of having to input it every time. Play it with this patch! It’s a must-install for Mega Man X fanatics. Although I wish that there would be a separate sub-patch for the sub-tank change because it makes the hidden Hadouken upgrade too powerful since every time you got hit once, you can just replenish that small health back with no penalty, cheesing the rest of the game as a result.

Just a word of warning: if you’re playing on an FXPAK Pro / SD2SNES (I’m not sure if using a real SA-1 motherboard cartridge would apply), your flash cart will auto-update the save to your SD card every 15-20 or so seconds at a time instead of updating once you got past the password screen (because it’s using the battery SRAM area as work RAM as well, according to the SD2SNES FAQ) - so if you completed a stage before your save updates, you will lose your progress and will revert back to the previous save prior. In addition, if you turn off the console prematurely as the flash cart is updating, your SD card’s save will be corrupted (don’t worry it won’t affect your other saves and other files too, only Mega Man X’s) and the saved password you had prior will disappear! It will display the default password screen instead, but luckily your controller configurations will be unharmed, at least in my experience. So as a safety measure, hold RESET for a few seconds before turning off your console to guarantee a updated save once you have ended your session.

UPDATE 2023/2/1: Previous disclaimer has been replaced as the FXPAK Pro’s 1.11.0 firmware makes this patch work officially. Also a slight tweak to the review.

Happy playing.

Version 1.2 Recommended - Yes

User Reviews
The only way to playwilsonics04 Dec 20221.2Yes
An X-cellent must-have hack for MMX (+ a disclaimer for flash cart users)tsubasaplayer1602 Feb 20231.2Yes
Oh MY!!!!jmd648818 Aug 20201.2Yes
A highly recommended patch!BulkSlash09 Jun 20201.2Yes
The ultimate version of Mega Man X! (Just a couple suggestions)ShadowOne33301 Jun 20201.2Yes
This is truly amazing and the best part is the bugs got fixed!JUD6MENT04 Jun 20201.0Yes
A must! We need Rev 1, though...niuus26 May 20201.1Yes
Awesome!ParkerMcFly06 Jun 20201.1Yes
Unbelievable differencenobi24 May 20201.1Yes
Great Hack! but be careful what Emulator you choose (Video inside)MagusLOGS28 May 20201.1Yes
Great Hack, but needing a tweak or 2Mugen_Ketsueki19 May 20201.0Yes
Great hack, but needs some bug fixesdrunk_caterpillar25 May 20201.1Yes
Much appreciated improvementsMattKimura19 May 20201.0Yes