nesdev.org

I have never worked with 74HC257 before, only with 74HC245 and 74HC139 to make 16bit EPROMs compatible with 8bit SNES board. (I wouldn't mind knowing how this works though). Either way, don't solder directly onto the cartridge connectors. Use the pins from the old ROM instead. A14 should be pin 31 ...

Another issue can be the capacitors though. I had to experience that on my own when the first (usually NC or GND) and last pin (5V) weren't connected to the capacitor nearby. Then again, a 256kb SRAM has A14 for Pin 1, which should just normally connect to A14 on the MaskROM. Important is that 5V i...

Ice Man wrote:Hmm, would you mind posting a photo of the front and back side of the PCB?

sure! I had this one laying around with nothing on it.

This is just a comparison between LoRom and HiRom. You can tell by the PCB Label. SHVC-1JxM-xx or SHVC-1JxB-xx is HiRom. SHVC-1AxM-xx or SHVC-1AxB-xx is LoRom. Number can differ. It depends how many MaskROMs are on the PCB. Edit: May I ask which game you are trying this with? Madden 95. I wire the ...

Ice Man wrote:Yea. Is there a capacitor between Pin 1 and 28 for the old SRAM?

Not sure. Will take a look this afternoon. I still can't get it going using this below:

http://nintendoallstars.w.interia.pl/romlab/hirom.htm

Ahhh ok, bend up pin 1 and 26 on the 256k chip, and wire it to mask rom A13/14 correct?

Thanks, but im fairly confused. According to the link below, there are no A13/A14 on the madden boards?

http://nintendoallstars.w.interia.pl/romlab/sram64.txt

Trying to make a game, but requires 256k sram. I have the 256k off a mario paint. Can I swap the 64k on the madden out with a 256k, or will it need rewired? Thanks

Just wondering if any more progress has been made on the software to be able to dump SNES games?

What do you mean by "more legit"? Its a repro, nothing legit about it =)

I apologize if this has been posted before...I did a search and couldn't find what I was looking for. I was trying to make myself a Fire Emblem Thracia 776 cart (which uses a 256Kbit sram), using a NBA live '96 cart (64kbit sram,has the Mad-1 chip). What I did is take a 256kbit sram and dropped it ...

Ive been testing out the Zelda AST for Mark. Everything works great. Saves switch over to the next week etc just like they are suppose to. I thought I had an issue at one point, but realized that the time for the week had ran out, so turned out to not be an issue at all, just slow game play on my pa...

I mailed it to Tormentor for play testing. Can hardly wait to see what he says. Oh, in case anyone was wondering, the adapter I'm making should fit in a SFC case too... Should get final set of boards in about 3 weeks Im through week 1. Everything saved perfect, and week 2 loads as it is suppose to ...

The 4 megabyte versions are on the page too. No idea if they work on real hardware or not though. I programmed the roms (x4) and mounted them to my adapter. The games all boot and cycle correctly. I'm not a Zelda player so if someone wants to test this cart for me, I'll send it to you. MottZilla-- ...

josete2k wrote:Yes, LoRom and 64kb SRAM





He's using a pic12F629 instead the binary counter 393, so you can manage the bankswitching more accurate.

Where are those wires going to in the back? Do you have a pic of it? Thanks