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Hi. I've tried my first cartridge reproduction. I used Super Mario 1 as donor cartridge and copied Galaxian on the Eproms. I tested all connections. However, the screen remains blank. LED on NES is on and not blinking, but is only dim. Does anyone know why this doesn't work? Thanks!

Super Mario Bros has 32k PRG, and Galaxian has 8k. How did you fill up the other 24k of space? Did you duplicate Galaxian's ROM 4 times to fill it up (correct), or did you just leave a bunch of empty 0s (incorrect) or something?

You are shorting +5V to ground.

Thanks, rainwarrior. You are right, I did not fill up the rest. For a beginner, how do I do that?

@ lidnariq: I will check that. Thanks!

If you have the binary, you can write in a .txt file

.incbin "galaxian.bin"
.incbin "galaxian.bin"
.incbin "galaxian.bin"
.incbin "galaxian.bin"

provide a path between the "" if necessary, and assemble in any assembler. sometimes the directive is called .bin instead of .incbin. Both may work in some assemblers.

That will pack four copies of galaxian in one binary to fill up ROM space.

You can also roll the four includes in a .repeat / .rept directive, bit if you have to look that up, it's just faster to type .incbin four times and go.

_________________
http://www.frankengraphics.com - personal NES blog

If you are using Windows, you may also do this

^^ That's even faster.

I've just started using linux (console). Could i achieve the same with mv or cp?

_________________
http://www.frankengraphics.com - personal NES blog

*n*x: use cat and redirects (cat file file file file > output)

Many thanks, that helped.

Now, I used Wild Gunman. And it runs. It even reacts to the lightgun.
Except that the background graphics is missing. Please see image.
I tested all connections a thousand times. Does that mean the
chr eprom is somehow distorted? I'm reluctant to de-solder
everything...

It's probably the mirroring. There is a jumper on the board where you can select H or V. Try setting it so H is closed and V is open (or whatever is the opposite of what it is now).

That was it!! Many thanks! Very friendly community.

All the effort for... Wild Gunman...