i have released my everdrive MD flashcart for SEGA

For hardware talk only (please avoid ROM dumper stuff)
KRIKzz
Interested
Posts: 20
Joined: Wed Jul 22, 2009 11:25 am
Location: Ukraine
Contact:

i have released my everdrive MD flashcart for SEGA

Post by KRIKzz » Sat Feb 27, 2010 4:25 am

revision 2.0 available now!

device description:

Flash cart for SEGA megadrive/genesis

+SEGA megadrive/genesis games supported.

+SEGA maser system games supported.

+32kb FRAM for game saves keep.

+save ram data can be stored or loaded from SD card

+saves available for megadrive/genesis and master system games

+SD/MMC cards support.

+FAT16 support. 2GB max partition size

+cart can change console region, for disable regional securuty.

+connection to PC and any additional software is not required

+button for pause in SMS games

+module system

more info you can see on my website. so say hi (:
Image
Last edited by KRIKzz on Sun Mar 21, 2010 12:11 pm, edited 1 time in total.

User avatar
TmEE co.(TM)
Very interested
Posts: 2360
Joined: Tue Dec 05, 2006 1:37 pm
Location: Estonia, Rapla City
Contact:

Post by TmEE co.(TM) » Sat Feb 27, 2010 8:56 am

This is looking very very lovcely, I hope you'll be able to sell lot of those :)
Mida sa loed ? Nagunii aru ei saa ;)
http://www.tmeeco.eu
Files of all broken links and images of mine are found here : http://www.tmeeco.eu/FileDen

Chilly Willy
Very interested
Posts: 2754
Joined: Fri Aug 17, 2007 9:33 pm

Post by Chilly Willy » Sat Feb 27, 2010 7:36 pm

Looks good! I'll have to get one. :D

User avatar
Stef
Very interested
Posts: 2959
Joined: Thu Nov 30, 2006 9:46 pm
Location: France - Sevres
Contact:

Post by Stef » Sat Feb 27, 2010 8:48 pm

oh sweet !

eteream
Very interested
Posts: 81
Joined: Tue Dec 22, 2009 2:13 pm

Post by eteream » Sat Feb 27, 2010 11:03 pm

lovely!
I need one of those. You have an email.

What about save state feature? Just kidding! But... is it possible?

KRIKzz
Interested
Posts: 20
Joined: Wed Jul 22, 2009 11:25 am
Location: Ukraine
Contact:

Post by KRIKzz » Sat Feb 27, 2010 11:52 pm

eteream wrote:lovely!
I need one of those. You have an email.

What about save state feature? Just kidding! But... is it possible?
save state like on emulator? i think it is impossible, but... snes have device for save state. in any case i have not idea how is it work (:

KRIKzz
Interested
Posts: 20
Joined: Wed Jul 22, 2009 11:25 am
Location: Ukraine
Contact:

Post by KRIKzz » Sun Feb 28, 2010 12:18 am

i publish everdrive OS src, modules, hardware spec and videofiles
Stef wrote:oh sweet !
BTW you GenesisDev04 help me to build software for this cart (:

Mask of Destiny
Very interested
Posts: 591
Joined: Thu Nov 30, 2006 6:30 am

Post by Mask of Destiny » Sun Feb 28, 2010 8:58 am

Question: What kind of storage does this card have for the ROMs that are loaded off the SD card? Is it RAM or flash?

The reason I ask is that I don't personally have much interest in a flash-cart, but a reasonably priced RAM cart is very interesting to me, especially one with an SD interface.

How much storage is available on the cart to hold the ROM? 4MB?

KRIKzz
Interested
Posts: 20
Joined: Wed Jul 22, 2009 11:25 am
Location: Ukraine
Contact:

Post by KRIKzz » Sun Feb 28, 2010 2:24 pm

Mask of Destiny wrote:Question: What kind of storage does this card have for the ROMs that are loaded off the SD card? Is it RAM or flash?

The reason I ask is that I don't personally have much interest in a flash-cart, but a reasonably priced RAM cart is very interesting to me, especially one with an SD interface.

How much storage is available on the cart to hold the ROM? 4MB?
ROM memory based on m29w640, it is flash, 8mb, but only half of this chip used for ROM

User avatar
Stef
Very interested
Posts: 2959
Joined: Thu Nov 30, 2006 9:46 pm
Location: France - Sevres
Contact:

Post by Stef » Sun Feb 28, 2010 6:52 pm

KRIKzz wrote: BTW you GenesisDev04 help me to build software for this cart (:
Glad it helped you :)

eteream
Very interested
Posts: 81
Joined: Tue Dec 22, 2009 2:13 pm

Post by eteream » Mon Mar 01, 2010 1:53 am

KRIKzz, is possible to replace the OS (boot, menu, etc...) with custom one?

(to enjoy personal graphics, for example)

User avatar
HardWareMan
Very interested
Posts: 727
Joined: Sat Dec 15, 2007 7:49 am
Location: Kazakhstan, Pavlodar

Post by HardWareMan » Mon Mar 01, 2010 3:46 am

eteream wrote:KRIKzz, is possible to replace the OS (boot, menu, etc...) with custom one?

(to enjoy personal graphics, for example)
I think it's not a problem. All you need is to know hardware memory and register map.

KRIKzz
Interested
Posts: 20
Joined: Wed Jul 22, 2009 11:25 am
Location: Ukraine
Contact:

Post by KRIKzz » Mon Mar 01, 2010 3:57 am

eteream wrote:KRIKzz, is possible to replace the OS (boot, menu, etc...) with custom one?

(to enjoy personal graphics, for example)
yes, but be careful. cart will be damaged if you replace main and reserve copy of OS by some inoperative. for restore, in this case, must be used external device, for reprogram bios. you can test costum OS before original OS will be replaced, just install this as module and run

Graz
Very interested
Posts: 81
Joined: Thu Aug 23, 2007 12:36 am
Location: Orlando, FL

Post by Graz » Tue Mar 02, 2010 1:56 am

KRIKzz wrote:ROM memory based on m29w640, it is flash, 8mb, but only half of this chip used for ROM
That is a 3.3V supply part with an absolute max supply voltage of 4V. I assume you've used a 3.3V regulator for supply, but I don't see any level shifters in your pictures and the IO isn't 5V tolerant. How does it handle being stuffed on the 5V 68K bus?

KRIKzz
Interested
Posts: 20
Joined: Wed Jul 22, 2009 11:25 am
Location: Ukraine
Contact:

Post by KRIKzz » Tue Mar 02, 2010 2:20 am

Graz wrote:
KRIKzz wrote:ROM memory based on m29w640, it is flash, 8mb, but only half of this chip used for ROM
That is a 3.3V supply part with an absolute max supply voltage of 4V. I assume you've used a 3.3V regulator for supply, but I don't see any level shifters in your pictures and the IO isn't 5V tolerant. How does it handle being stuffed on the 5V 68K bus?
VCC Max = 4.0v
VIO Max = VCC +0.6 = 4.6
and maximum voltage may overshoot to VCC +2V during transition and for less than 20ns during transitions.
so all is ok

Post Reply

Who is online

Users browsing this forum: No registered users and 1 guest