GreDe85
Posts: 1
Joined: 03 Jul 2019, 20:35

Does Mega SD work as Mega CD RAM-backup cart?

03 Jul 2019, 20:37

Hi,

Just asking, that does Mega SD work as RAM -backup cart when playing games on original Mega CD hardware?

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neodev
Posts: 452
Joined: 09 Apr 2018, 14:47

Re: Does Mega SD work as Mega CD RAM-backup cart?

03 Jul 2019, 23:59

I want to add that feature to the release firmware, I hope I can make it in time, so you can export saves from your original megacd to the megasd, and continue your previos saved games.

ginoscope
Posts: 5
Joined: 09 Feb 2019, 15:25

Re: Does Mega SD work as Mega CD RAM-backup cart?

15 Aug 2019, 16:26

I am curious about this to as well. I have a JVC X'Eye that I know does not work with the mega sd but functions as a flash cart. If the Mega SD works as a back up ram cart I can just use the mega sd to replace my mega everdrive as a cd ram cart.

I know it sounds redundant to use the actual cd hardware when you have the mega sd but it would be a nice option.

bumfacekilla
Posts: 15
Joined: 08 Aug 2019, 17:50

Re: Does Mega SD work as Mega CD RAM-backup cart?

18 Aug 2019, 14:57

If you use the Mega SD to load a BIOS on your original hardware (preferably the BIOS version or region free equivalent that matches the hardware you are using), the Mega SD will work as a RAM cartridge. The data will be saved to your BUP folder as an SRM file with the same name as the BIOS you load.

stardragon2020x
Posts: 5
Joined: 10 Jul 2020, 22:40

Re: Does Mega SD work as Mega CD RAM-backup cart?

10 Jul 2020, 22:51

I've tried this but the system just freezes at the bios screen when I try to load the bios file from MegaSD
I'm using a US Sega CD version 2 system and version 2 bios file with a Mega SG console

stardragon2020x
Posts: 5
Joined: 10 Jul 2020, 22:40

Re: Does Mega SD work as Mega CD RAM-backup cart?

10 Jul 2020, 23:02

I've now tried multiple bios files. They all freeze. Am I supposed to be naming them something special or do they have to go in a particular location on the card rather than just the root? I don't get it.

Gummy Bear
Posts: 108
Joined: 09 Feb 2019, 22:56

Re: Does Mega SD work as Mega CD RAM-backup cart?

14 Jul 2020, 02:05

I'd put folding money on this being a Mega SG issue again.

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Segaheart99
Posts: 47
Joined: 20 Apr 2020, 10:51

Re: Does Mega SD work as Mega CD RAM-backup cart?

23 Jul 2020, 16:37

Gummy Bear wrote:
14 Jul 2020, 02:05
I'd put folding money on this being a Mega SG issue again.
While we all know you have a vendetta against analogue let it go unless you test it first

@stardragon2020x

Accessing the bios work fine on my mega sg and mega sd but am using the recommend bioses mention in the documention and not the the region free ones.

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Segaheart99
Posts: 47
Joined: 20 Apr 2020, 10:51

Re: Does Mega SD work as Mega CD RAM-backup cart?

23 Jul 2020, 22:21

Posted be neodev

There is a problem with certain Megadrive modes where the CD bios replacement doesn't work properly, showing the fixed image.
However, you can force megasd to just do the RAM Cart emulation instead of full cd bios replacement. In order to do so, create a file named the same than the CD bios file you are loading, but ending in .cfg (if you have us_bios_2.00w.bin, name it us_bios_2.00w.cfg) then open with notepad and write
Mapper=2E

then when loading that bios file as a rom in megasd, it will boot using your original CD bios, and megasd will act as just a RAM cart

I posted this as the op has posted the same question In a different thread where it always nice to have all in one place

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