I programmed and soldered in two EPROM into a NROM-256 board. It's a Mario 1 hack with new levels ect. The game turns on and is working but the scrolling levels are all garbled up. And by that I mean half the screen is different than the other but the graphics look fine. The screen is somewhat "split"
I used two 27c256 eproms and checked the vert/horiz mirroring on the board was correct. I had to duplicate the CHR data to fill the chip. The PRG was 32k already so no duplicating was necessary.
What did I do wrong?
Whats wrong with my custom NROM project?
Whats wrong with my custom NROM project?
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Last edited by Rayban on Wed Mar 09, 2011 11:30 pm, edited 1 time in total.
10001110101Re: Whats wrong with my custom NROM project?
Ok so it turns out that I did have the mirroring wrong. Switched it to "H" and it works flawlessly!
10001110101Re: Whats wrong with my custom NROM project?
As a tip, you can leave the 8K data, but tie the un-used data lines low (?) so it always boots up in your 8K bank of data. [This is built into the Nintendo NROM boards! 
]
Congrats on getting this working, hope you used my tool.
]Congrats on getting this working, hope you used my tool.
Re: Whats wrong with my custom NROM project?
I did use your program! Thank you very much for that!3GenGames wrote:As a tip, you can leave the 8K data, but tie the un-used data lines low (?) so it always boots up in your 8K bank of data. [This is built into the Nintendo NROM boards!
Congrats on getting this working, hope you used my tool.
10001110101Re: Whats wrong with my custom NROM project?
Good to know it worked, thanks!Rayban wrote:I did use your program! Thank you very much for that!3GenGames wrote:As a tip, you can leave the 8K data, but tie the un-used data lines low (?) so it always boots up in your 8K bank of data. [This is built into the Nintendo NROM boards!
Congrats on getting this working, hope you used my tool.