Author Topic: Master Everdrive and Sega Mark III  (Read 8792 times)

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Offline dudutop

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Master Everdrive and Sega Mark III
« on: January 25, 2016, 11:51 AM »
Hello Everybody !

I am new on this forum, and I need help about Master Everdrive ...
I have a Sega mark III, I bought an adaptator SMS to Mark III, but
when I plug the masterED in it, it doesn't work ...
My masterED is working with OS 8.
I have read some informations on this forum, and apparently a downgrade
is required, to OS 5 ? How can I perform this ? Or is there another solution ?

Thank you for helping !

Offline D.Lo

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Re: Master Everdrive and Sega Mark III
« Reply #1 on: January 31, 2016, 06:00 AM »
Yes you need to downgrade to OS version 5.

It works fine, 100% compatibility, see here:

http://nintendosegajapan.com/2015/03/13/creation-of-a-sega-mark-iii-everdrive-flash-cart/

To downgrade, just add the firmware to your SD card, name the file extension .mso and load it.

Offline dudutop

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Re: Master Everdrive and Sega Mark III
« Reply #2 on: February 02, 2016, 02:09 PM »
@D.Lo,

Thank you for reply ! I will try this method soon,
and I hope it will work fine !


Offline kapi21

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Re: Master Everdrive and Sega Mark III
« Reply #3 on: January 19, 2020, 05:31 PM »
Hi, sorry for refloating this post.
I wanted to know if the everdrive cartridge in Mark III worked this way.

I have also read about a mod that was changing a plate capacitor.

Greetings and thank you.


« Last Edit: January 19, 2020, 05:33 PM by kapi21 »

Offline keeper7

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Re: Master Everdrive and Sega Mark III
« Reply #4 on: January 21, 2020, 11:16 AM »
Hi, sorry for refloating this post.
I wanted to know if the everdrive cartridge in Mark III worked this way.

I have also read about a mod that was changing a plate capacitor.

Greetings and thank you.

Have you tried os-v9.mso?
I'm asking because I have a japanese Master System and MasterED only works with os-v5.mso and os-v9.mso using that system.
Since Mark III is more or less a japanese Master System, maybe a downgrade isn't necessary.