Hi there,
This is my first post, sorry if details are lacking or too in depth!
Today I attempted to flash eeproms ( 2 x S27c256 taken from an old arcade board) with Super Mario Bros and install them in a NROM-256-04 board in preparation for flashing my own roms. But alas I couldn't even get this repro to work. I picked SMB because I know that's what the cart used to be, and wanted the easiest first test T__T
The board I used was previously used for GlitchNES roms so already had chip sockets.
I found a (E) ROM, split it using TNINES, using -s switch. This gave me a 32K PRG and 8K CHR. I flashed the PRG as 32K is the right size for 27c256, right? Then tried both quadrupling the CHR to 32K (using copy /b) and later, flashing it at just the 8K size but neither worked. (Which is correct please?!)
Basically I followed this http://callanbrown.com/index.php/basic-nes-reproduction
Eeproms blank checked okay, then after writing to them, verified correctly. I used a minipro for the writing.
When I put the cart I just get a blinking red light, flashing in time with the screen turning on and off, resetting doesn't help. When I put an unmodified copy of SMB in it runs first time, no problems.
Is there anything obvious I am doing majorly wrong?
Could someone clear up my queries about the ROM sizes please?
If there's not, am I to assume it is in fact the cartridge pcb? Is there anything in this process that can cause the blinking light except for physical fault with the connection between the board and cart?
Thank you muchly for any light you can shed !
This is my first post, sorry if details are lacking or too in depth!
Today I attempted to flash eeproms ( 2 x S27c256 taken from an old arcade board) with Super Mario Bros and install them in a NROM-256-04 board in preparation for flashing my own roms. But alas I couldn't even get this repro to work. I picked SMB because I know that's what the cart used to be, and wanted the easiest first test T__T
The board I used was previously used for GlitchNES roms so already had chip sockets.
I found a (E) ROM, split it using TNINES, using -s switch. This gave me a 32K PRG and 8K CHR. I flashed the PRG as 32K is the right size for 27c256, right? Then tried both quadrupling the CHR to 32K (using copy /b) and later, flashing it at just the 8K size but neither worked. (Which is correct please?!)
Basically I followed this http://callanbrown.com/index.php/basic-nes-reproduction
Eeproms blank checked okay, then after writing to them, verified correctly. I used a minipro for the writing.
When I put the cart I just get a blinking red light, flashing in time with the screen turning on and off, resetting doesn't help. When I put an unmodified copy of SMB in it runs first time, no problems.
Is there anything obvious I am doing majorly wrong?
Could someone clear up my queries about the ROM sizes please?
If there's not, am I to assume it is in fact the cartridge pcb? Is there anything in this process that can cause the blinking light except for physical fault with the connection between the board and cart?
Thank you muchly for any light you can shed !