nesdev.org

nintendo2600 wrote:

infiniteneslives wrote:

nintendo2600 wrote: So like this you mean?

Yeah and with the diode note

does it matter much if I use a Zenner or Scholky diode? I got a bunch of the later but not so many of the former.

Zener will NOT (or atleast shouldn't) work. You want to use schottky doides if you can, however I've had some sucess with some standard switching diodes like 1N4148's You can get them at radioshack. But if you really care about not loosing your progress get some schottkys.

Here's what I use:
http://search.digikey.com/us/en/product ... -ND/763444

infiniteneslives wrote:
Here's what I use:
http://search.digikey.com/us/en/product ... -ND/763444

Are these compairable to what your using? They are do35 not do34 so I thought I'd ask before purchasing anything.

http://www.ebay.com/itm/50x-BAT85-Schot ... 4cfcf946a9

Also for the 22uf cap does it matter if I choose to use 16v over 50v or visa versa?

For electrolytic capacitor, the higher the voltage rating you choose the lower the capacitance will be if you "undervolt" it.

I don't think using an 50v part would be "too bad" if it's just being used for decoupling of the power line. You can get away with any capacitors up to 100uF. (100uF is overkill so something around 22-47uF will do.)



The schematics above should help you with the connections.

nintendo2600 wrote: Are these compairable to what your using? They are do35 not do34 so I thought I'd ask before purchasing anything.

Yeah those should work

hey guys^^
i had a quick look at the thread and i also wanted to do a repro of Super Mario Adventures, and here is what i got:
- An already modded TSROM (SMB3)
- Two W29C020 (256x8kbit chips) (are on their way to me^^)
-the patch that has made to be compatible for hardware repro (thx to infiniteneslives)

my questions are:
i wanted to use the save function of the game and read that i have to modify pin #28 of the wram (sram) to add save function to the board and i wanted to know if the tsrom is a proper donor cart for this mod.
i also wanted to know if anyone knows if the W29C020 (Windbond) chips are compatible for nes repros ( i checked the pinout and it has the same as the 29F010 i am using for the tsrom at the moment;))

i appreciate any advice and help

If you connect the flashrom /OE pin to GND (just like Nintendo does with the WRAM chip) and use /CE to enable the flash memory (Like Nintendo does with it's original maskroms, except that most Nintendo MASKROMS have their /OE pin tied low internally so only /CE pin is exposed outside instead of both pins).

If you connect the flash memory that way, /WE pin will be ignored allowing you to use an standard EPROM/FLASH ROM pinout (27C4001 compatible pinout for example)...

l_oliveira wrote:If you connect the flashrom /OE pin to GND (just like Nintendo does with the WRAM chip) and use /CE to enable the flash memory (Like Nintendo does with it's original maskroms, except that most Nintendo MASKROMS have their /OE pin tied low internally so only /CE pin is exposed outside instead of both pins).

If you connect the flash memory that way, /WE pin will be ignored allowing you to use an standard EPROM/FLASH ROM pinout (27C4001 compatible pinout for example)...

thx for the answer ^^
i thought someone already tried with W29C020 and can confirm that these could be used for tsrom (i am not sure if they work because of their speed)

aliman wrote: thx for the answer ^^
i thought someone already tried with W29C020 and can confirm that these could be used for tsrom (i am not sure if they work because of their speed)

I wrote that, because if you tie /CE and /OE together and connect to the mapper chip, it will work neat with EPROMS but flash will fail (unless /WE pin from flash is tied to +5v). And it happens that /WE pin on all flash memories is A18 for 27C4001 EPROM. The mapper drives that pin low most of the time (as to read the lower 256 half of the total memory it can address).

ohh didnt got that at first I've already done so

just a question:
my w29c020 won't work for unknown reason.
i've tested other flash roms (29f010) on the same board and it worked but the windbond w29c020 (with the exact same pinout) won't work...
any ideas why?

ps: my chip programmer says that they are equivalent to ae29f2008

aliman wrote:just a question:
my w29c020 won't work for unknown reason.
i've tested other flash roms (29f010) on the same board and it worked but the windbond w29c020 (with the exact same pinout) won't work...
any ideas why?

ps: my chip programmer says that they are equivalent to ae29f2008

Make sure pin 31 is connected to VCC (it's the write enable pin for flash rom, used to reprogram it. While on programming mode it cannot be read hence it not working).

connecting /we to vcc didn't solve the problem.
any other suggestions?

aliman wrote:connecting /we to vcc didn't solve the problem.
any other suggestions?

If that didn't solve the problem, then it's obvious you have a wiring problem. Does the normal MARIO 3 ROM work on your board ?

okk i've solved it thanks to l_oliveira^^
somehow the gnd pin of my chip bend up itself...
but now it works:)

Dammit, I've almost gotten this to work.

I've got a socketed NES-TSROM-04 dev cart that I've used to play many games simply by popping in other EPROMs (D-Pad Hero, D-Pad Hero 2, Super Mario 2j, Pussy City Pimps, etc.). For Mario Adventure, I applied the patch to a Super Mario 3 rom file, split it, burned the chips, and I'm getting the following results: the sound works, controller responds properly, but the graphics are pretty messed up. I don't get any intro screen displayed, but I can hit Start and it will go to the first map. Again the graphics won't be right (no info bar across the bottom of the screen, no Mario, but some of the map's "paths" will be there) , but the sound and controller functions seem to work. Just for kicks, I burned a set of chips for SMB3 and it works fine.

Any ideas? Should I try it on a different board?