nesdev.org

Can any one tell me where i can buy or make my own eprom burner? I want to write/rewrite my own demos and play them on the NES.
What chip do i use?
I remember this site http://www.gameboymall.com that sold eprom burners and chips for NES Dev. but that site is not working anymore? Does anyone know of a another site? Can the CopyNES do what im asking?

Thanks in advance,
EL

you can get them off of ebay for around $50. I have a willems programmer I got from mcumall.com on one of his ebay auctions. It's worked well for me so far, but I know a lot of people who prefer something that's inclosed rather than my open circuit board style.

what is the model number im looking for? and what chip do i use? What program do i write it with? Any other Steps.

I bought my programmer from this store. It's the one right at the top of the page. It is cheap, comes with software and cables, works perfectly with a lot of chips.

If you plan on rewriting the chips over and over, I suggest you use Flash Memory - Atmel Type. The store has chips from 32kb to 512kb, wich is a pretty good range for NES use. The 32kb chips will work on NES carts whithout any rewiring, the others may need some.

i have to buy two right one for the chr and the other for prg data

while we're on the subject of eproms, can one be erased if it's left in the sun for a few days? (of course at night there wouldn't be sunlight, but UV would still be there (really low)) hehe

I made a programmer that was very cheap probably under $10 depending on what you have lying around.
http://www.zws.com/products/epromr2/epromr_stage1.html
Futurlec is great for parts and EPROM's. I think it would take months for the sun to erase an EPROM, not too much UVC around luckily.

I got the willem 3.5 dual power (usb or you can get a ac adaptor) for around $45 on ebay from some guy in canada. The 4.5 on the linked page looks interesting, but I didn't want to get it from overseas.

You only need one, you just program one chip at a time. Program the chr and then program the prg. You will have to learn how to manually cut off the header and split files in a hex editor or you will have to find a program that does it for you. I think I saw such a program in the forum recently, but I don't remember where.

The chips depend on what size you need for the dev carts your making.

You do need an eprom eraser if you are going to want to use eproms more than one time. Sunlight is not an option. Well it is if you want to wait till retirement to use them! I got my eprom eraser for about $40 on ebay. I found a good industrial strength one that I have only ever seen one of. Since the light can damage your eyes, I'm slightly scared by some of the cheap looking ones from Hong Kong on ebay.

You can also just use flash memory which can be erased by your eprom programmer. It's a little more expensive per chip, but then you don't have the cost of an eraser.

sevast wrote:You can also just use flash memory which can be erased by your eprom programmer. It's a little more expensive per chip, but then you don't have the cost of an eraser.

You also don't have to wait several minutes to erase the chips. I think flash ROM's don't even have to be erased, you can just program the new data over the old one. Quick and easy.

I bought the one Tokumaru bought, and it's a decent item. The shipping was quick, and well packed.

But are there any other chips i can write to that dont need to be rewritten and only wrote too.

Like a Cross Refrence match for the 6502.
These will come cheaper than flash epproms and can buy them by the dozen.
I think i remember www.gameboymall.com selling some king of cross reference match for the 6502. Does any one remember?

I want to have two chips that can be written and rewritten to test my demos and i then i want to be able to actually keep my demos as a collection using only chips that can written too. Will i be able to use both with the Epprom Programmer?

The programmer can use many kinds of chips. I say use Flash for development (rewrite) and use regular EPROMs to keep the games. The programmer supports both.

Just buy a UVC light bulb for about $15 and a fixture for about $5 or so and you have an eraser. Just don't expose yourself. I cover mine with a cloth or just leave the room for a half hour.

i've read about an article using garden-lamp!!! hmmm.. aren't those emitting infra-red???? instead of UV??

Can Flash be programmed with just USB power? Because I know I was told that EPROMs require like 12.5 volts, and USB only offers like 5 or so volts. Is that true? And does Flash require less? Because if that's true, that might actually explain why none of my stuff works, because I program EPROMs with USB power, and that might not be enough voltage for it to work.