Author Topic: Noticed something odd about the Everdrives and Clones  (Read 2145 times)

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Offline Majestic_Lizard

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Noticed something odd about the Everdrives and Clones
« on: August 06, 2018, 08:13 AM »
I have several Everdrives that I've purchased over the years.  This post is NOT a criticism, but seems to suggest an advantage over real cartridges in some situations.

An issue I've noticed is that some cartridges that will NOT play on one of my clones WILL PLAY as ROM images on exactly the same consoles through the Everdrive.

For example, my Castlevania 3 cartridge will not play correctly on my Retro Duo (revision 3), but it will play on my Everdrive as a ROM image on the exact same console. There is nothing wrong the Castlevania 3 cart. It plays fine on a real NES and some clones that were modified with an additional IC to support it.

Another example is that my copy of Super Street Fighter 2 for the Genesis has graphical errors on my Sega Genesis clone, but again will play perfectly as a ROM image on the everdrive using the exact same clone. Again, nothing wrong with the original cart. It plays fine on three real Genesis consoles. Only has issues on the clone.

To be clear, what I'm saying is that on some of my clone consoles, the games that do not work properly as real cartridges will play perfectly on the Everdrive.

Does anyone have an explanation for this? It isn't a criticism, but it is weird.
« Last Edit: August 06, 2018, 09:06 AM by Majestic_Lizard »

Offline lee4

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Re: Noticed something odd about the Everdrives and Clones
« Reply #1 on: August 06, 2018, 09:59 AM »
because clone (system-on-chip) system is missing a one data line to read special mapper chips correctly
and cause clone can not see the 2nd rom chip (Genesis SSF2) or special chip (Castlevania 3) on real cart.

with Everdrive emulates special mapper chips with more
and plus rom image is 1 file instead of 2
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Offline Majestic_Lizard

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Re: Noticed something odd about the Everdrives and Clones
« Reply #2 on: August 06, 2018, 10:04 AM »
because clone (system-on-chip) system is missing a one data line to read special mapper chips correctly
and cause clone can not see the 2nd rom chip (Genesis SSF2) or special chip (Castlevania 3) on real cart.

with Everdrive emulates special mapper chips with more
and plus rom image is 1 file instead of 2

Thanks for the insights. I thought it might have something to do with too many discrete ICs, but wasn't sure what the case would be. Again, thanks.

Offline PalAndreew

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Re: Noticed something odd about the Everdrives and Clones
« Reply #3 on: August 06, 2018, 03:23 PM »
I also noticed an interesting feature of the Everdrive N8: - before I eliminated the effect such as "Jailbar" (a prison grid of gray, vertical bars all over the screen) - I clearly and definitely noticed: on the everdrive N8 (FC) is much smaller these "vertical stripes" than, say, the original, Japanese cartridges. At the present time, I completely got rid of the vertical stripes, combining all the known ways of dealing with the "jailbar" ... perhaps it can be explained by extremely thin tracks, the presence of a "shielded" layer of copper on one side of the board and the density is placed th track. and maybe - because "tantalum" capacity of increased value is used (As a filter for RF interference.)
« Last Edit: August 06, 2018, 03:30 PM by PalAndreew »

Offline Cannocto

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Re: Noticed something odd about the Everdrives and Clones
« Reply #4 on: August 10, 2018, 10:10 AM »
We sincerely hope that this discussion will make it even more clear.