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KRIKzz
Interested
Joined: 22 Jul 2009
Posts: 18
Location: Ukraine
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 Posted: Sat Feb 27, 2010 4:25 am Post subject: i have released my everdrive MD flashcart for SEGA |
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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 (:
Last edited by KRIKzz on Sun Mar 21, 2010 12:11 pm; edited 1 time in total |
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TmEE co.(TM)
Very interested
Joined: 05 Dec 2006
Posts: 1947
Location: Estonia, Mahtra village
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| Posted: Sat Feb 27, 2010 8:56 am Post subject: |
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This is looking very very lovcely, I hope you'll be able to sell lot of those 
_________________
Mida sa loed ? Nagunii aru ei saa  |
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Chilly Willy
Very interested
Joined: 17 Aug 2007
Posts: 1955
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| Posted: Sat Feb 27, 2010 7:36 pm Post subject: |
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Looks good! I'll have to get one.  |
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Stef
Very interested
Joined: 30 Nov 2006
Posts: 1257
Location: France - Sevres
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| Posted: Sat Feb 27, 2010 8:48 pm Post subject: |
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| oh sweet ! |
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eteream
Very interested
Joined: 22 Dec 2009
Posts: 72
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| Posted: Sat Feb 27, 2010 11:03 pm Post subject: |
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lovely!
I need one of those. You have an email.
What about save state feature? Just kidding! But... is it possible? |
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KRIKzz
Interested
Joined: 22 Jul 2009
Posts: 18
Location: Ukraine
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| Posted: Sat Feb 27, 2010 11:52 pm Post subject: |
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| 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 (: |
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KRIKzz
Interested
Joined: 22 Jul 2009
Posts: 18
Location: Ukraine
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Mask of Destiny
Very interested
Joined: 30 Nov 2006
Posts: 165
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| Posted: Sun Feb 28, 2010 8:58 am Post subject: |
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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? |
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KRIKzz
Interested
Joined: 22 Jul 2009
Posts: 18
Location: Ukraine
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| Posted: Sun Feb 28, 2010 2:24 pm Post subject: |
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| 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 |
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Stef
Very interested
Joined: 30 Nov 2006
Posts: 1257
Location: France - Sevres
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| Posted: Sun Feb 28, 2010 6:52 pm Post subject: |
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| KRIKzz wrote: |
BTW you GenesisDev04 help me to build software for this cart (: |
Glad it helped you |
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eteream
Very interested
Joined: 22 Dec 2009
Posts: 72
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| Posted: Mon Mar 01, 2010 1:53 am Post subject: |
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KRIKzz, is possible to replace the OS (boot, menu, etc...) with custom one?
(to enjoy personal graphics, for example) |
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HardWareMan
Very interested
Joined: 15 Dec 2007
Posts: 542
Location: Kazakhstan, Pavlodar
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| Posted: Mon Mar 01, 2010 3:46 am Post subject: |
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| 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. |
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KRIKzz
Interested
Joined: 22 Jul 2009
Posts: 18
Location: Ukraine
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| Posted: Mon Mar 01, 2010 3:57 am Post subject: |
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| 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 |
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Graz
Very interested
Joined: 23 Aug 2007
Posts: 67
Location: Orlando, FL
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| Posted: Tue Mar 02, 2010 1:56 am Post subject: |
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| KRIKzz wrote: | ROM memory based on m29w640, it is flash, 8mb, but only half of this chip used for ROM
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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? |
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KRIKzz
Interested
Joined: 22 Jul 2009
Posts: 18
Location: Ukraine
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| Posted: Tue Mar 02, 2010 2:20 am Post subject: |
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| Graz wrote: | | KRIKzz wrote: | ROM memory based on m29w640, it is flash, 8mb, but only half of this chip used for ROM
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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 |
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