Author Topic: Getting Master Everdrive OS v8 working on SEGA MARK III  (Read 6442 times)

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Offline Neto

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Getting Master Everdrive OS v8 working on SEGA MARK III
« on: February 10, 2017, 04:23 AM »
After some tests I have found why Everdrive OS v8 fails to Boot on Sega Mark III.
Everdive set !Reset signal to High level on System Power, but as Mark III doesn't have this signal on Slot the !Reset take some time before goes High.
Changing capacitor C18 from 10uF to 0,1uF makes !Reset signal to goes high level fast and this is sufficient to get Everdrive OS v8 booting on a SEGA Mark III

I know this circuit is also called a POR (Power on Reset) and gives some time until system power is stable, but I did not find any issue when changing this.
Tested with regular Japanese and Export Cartridge and they booted fine.

Original post at SMS Power http://www.smspower.org/forums/16516-GettingMasterEverdriveOSV8WorkingOnSEGAMARKIII



Offline FeverDrive

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Re: Getting Master Everdrive OS v8 working on SEGA MARK III
« Reply #1 on: February 26, 2017, 05:13 AM »
Thanks for this, now I have to get a Sega Mark III  ;D

By the way are you that Sonic hacking guy?
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Offline Neto

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Re: Getting Master Everdrive OS v8 working on SEGA MARK III
« Reply #2 on: February 28, 2017, 08:47 PM »
By the way are you that Sonic hacking guy?
Esrael Neto? Yes, it's me.

Offline kapitostes

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Re: Getting Master Everdrive OS v8 working on SEGA MARK III
« Reply #3 on: May 09, 2017, 09:11 PM »
Hi guys. I just received a sega mark III and did not actually start the everdrive master. Could you tell me the voltage of the capacitor? Thank you.

Offline keeper7

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Re: Getting Master Everdrive OS v8 working on SEGA MARK III
« Reply #4 on: May 10, 2017, 08:21 AM »
Hi guys. I just received a sega mark III and did not actually start the everdrive master. Could you tell me the voltage of the capacitor? Thank you.

You can use one with the same value or higher voltage.

Offline kapitostes

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Re: Getting Master Everdrive OS v8 working on SEGA MARK III
« Reply #5 on: May 11, 2017, 01:39 PM »
Ok thanks!! 8)

Offline FeverDrive

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Re: Getting Master Everdrive OS v8 working on SEGA MARK III
« Reply #6 on: May 12, 2017, 10:17 PM »
Hi guys. I just received a sega mark III and did not actually start the everdrive master. Could you tell me the voltage of the capacitor? Thank you.

You can use one with the same value or higher voltage.
But make sure the capacitor isn't too big, it has to fit inside the console and the leads have to fit the PCB holes.
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Offline SmokeMonster

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Re: Getting Master Everdrive OS v8 working on SEGA MARK III
« Reply #7 on: May 16, 2017, 04:04 AM »
Excellent work, Neto! Thanks for the great write-up 8)