ToToTEK.COM Forum Index ToToTEK.COM
Help & Support Forum
 
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

Mgd 2 + 24mbit
Goto page 1, 2  Next
 
Post new topic   Reply to topic    ToToTEK.COM Forum Index -> Copiers and Hardware
View previous topic :: View next topic  
Author Message
philjay



Joined: 19 Dec 2022
Posts: 22

PostPosted: Fri May 26, 2023 8:50 am    Post subject: Mgd 2 + 24mbit Reply with quote

Hi, is it possibile to play sf2 ce on megadrive with a Mgd 2 with a 32mbit card?
How can i set up the interface to play a 24mbit card. I can set up 8/16/32.

Thank you
Back to top
View user's profile Send private message
mrforever



Joined: 19 Nov 2007
Posts: 75

PostPosted: Fri May 26, 2023 11:31 am    Post subject: Reply with quote

put directly 32mb of ram
Back to top
View user's profile Send private message
philjay



Joined: 19 Dec 2022
Posts: 22

PostPosted: Sat May 27, 2023 5:36 pm    Post subject: Reply with quote

Thank you, i tried but nothing. The dram works well, i can fill every slot and works. 2 slot filled with a game of 16mbit and 2 of 8mbit each works.
Back to top
View user's profile Send private message
mrforever



Joined: 19 Nov 2007
Posts: 75

PostPosted: Tue May 30, 2023 9:58 pm    Post subject: Reply with quote

so the 32mbit ram card is faulty.
Back to top
View user's profile Send private message
Mystic_Merlin



Joined: 15 Oct 2007
Posts: 496
Location: Bangkok

PostPosted: Wed May 31, 2023 5:07 am    Post subject: Reply with quote

The ram is not faulty, philjay mentioned he could map several games in different area of the ram card.

As you already found out from older threads there's a mod to map >16M games on the MD. I'm not sure if it's some type of demux or a custom mapper but I'd be curious to see it too if anyone has one.
Back to top
View user's profile Send private message
philjay



Joined: 19 Dec 2022
Posts: 22

PostPosted: Thu Jun 08, 2023 11:46 pm    Post subject: Reply with quote

I would like to know if anyone has ever thought to make a pcb gerber file to print of the dram card for mgd2. I think is simple to find the dram chip inside, the problem is drawing the pcb. Internally not seems complicated, just a pcb a 4 dram with a plastic cover.
Back to top
View user's profile Send private message
NorQue



Joined: 08 Jul 2006
Posts: 62

PostPosted: Fri Jun 09, 2023 2:54 pm    Post subject: Reply with quote

Yeah, MGD2 RAM cards super simple, indeed. It's on the plan for one of these rainy days, if someone else wants to give it a try I attached a picture of the PCB. Higher quality available on request. RAM is NEC D4248000GS, datasheets are available on the net.

EDIT: added another backside picture with a ruler.



PXL_20230609_150215035.jpg
 Description:
back #2
 Filesize:  153.47 KB
 Viewed:  3249 Time(s)

PXL_20230609_150215035.jpg



PXL_20230412_183648563.jpg
 Description:
front
 Filesize:  251.3 KB
 Viewed:  3250 Time(s)

PXL_20230412_183648563.jpg



PXL_20230411_155245292.jpg
 Description:
back
 Filesize:  87.61 KB
 Viewed:  3250 Time(s)

PXL_20230411_155245292.jpg


Back to top
View user's profile Send private message
philjay



Joined: 19 Dec 2022
Posts: 22

PostPosted: Fri Jun 09, 2023 9:51 pm    Post subject: Reply with quote

would be great, if someone draw the pcb from the photos!!!
Back to top
View user's profile Send private message
philjay



Joined: 19 Dec 2022
Posts: 22

PostPosted: Sat Feb 10, 2024 6:55 pm    Post subject: Reply with quote

Anyone knows which capacitors are installed in the sram card?
Back to top
View user's profile Send private message
Mystic_Merlin



Joined: 15 Oct 2007
Posts: 496
Location: Bangkok

PostPosted: Tue Feb 20, 2024 7:51 am    Post subject: Reply with quote

The one pictured above is using DRAM and they most certainly use standard 1uF capacitors.
We still need some pics of the SRAM ram board.
Back to top
View user's profile Send private message
philjay



Joined: 19 Dec 2022
Posts: 22

PostPosted: Tue Feb 20, 2024 7:02 pm    Post subject: Reply with quote

thanks to the great Michel Bee @docteurpcb on twitter we have now a repro pcb for Dram.
Now i'm waiting for the nec dram arriving from utsource and i will test.



WhatsApp Image 2024-02-20 at 19.59.23.jpeg
 Description:
 Filesize:  243.8 KB
 Viewed:  1515 Time(s)

WhatsApp Image 2024-02-20 at 19.59.23.jpeg



WhatsApp Image 2024-02-20 at 19.59.16.jpeg
 Description:
 Filesize:  243.94 KB
 Viewed:  1515 Time(s)

WhatsApp Image 2024-02-20 at 19.59.16.jpeg


Back to top
View user's profile Send private message
philjay



Joined: 19 Dec 2022
Posts: 22

PostPosted: Fri Feb 23, 2024 12:26 am    Post subject: Reply with quote

Works! We have now a Dram Repro for MGD2.
0.1 uF capacitors works too.
Back to top
View user's profile Send private message
NorQue



Joined: 08 Jul 2006
Posts: 62

PostPosted: Fri Feb 23, 2024 6:47 am    Post subject: Reply with quote

Nice, congrats! Looking great.
Back to top
View user's profile Send private message
philjay



Joined: 19 Dec 2022
Posts: 22

PostPosted: Sun Feb 25, 2024 11:42 am    Post subject: Reply with quote

Now, we need a sram cart scan to make a repro.
Anyone have one to scan?
Back to top
View user's profile Send private message
NorQue



Joined: 08 Jul 2006
Posts: 62

PostPosted: Sun Feb 25, 2024 1:29 pm    Post subject: Reply with quote

I do have a 8 MBit SRAM card, but it's quite a bit more complicated as the DRAM cards. It is also very weirdly multi-layered, with part of the SRAM sitting on a second PCB. Solder pitch of the SRAM also is a lot finer than DRAM.

Will you publish the Gerber file (and potential soure files?) for your DRAM card?
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    ToToTEK.COM Forum Index -> Copiers and Hardware All times are GMT
Goto page 1, 2  Next
Page 1 of 2

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You can attach files in this forum
You can download files in this forum


Powered by phpBB © 2001, 2005 phpBB Group