Hello.
I have found an old cartridge board on a very dirty deposit.
It was a real mess, and smelling really bad!!
I disassembled, cleaned, dumped the ROMs and scanned the board before reassembling.
The game is Dragon Fighter, an MMC1 game.
I got sad when I created a .nes file and no emulator ran it, but when I reassembled, it worked!!
I just say WOW!! The circuit board and components have taken a lot of abuse, and still work!!
What got my curiosity, is that the board has some connections from the MMC1's clone to something that should be some kind of CIC "stun" circuit.
The actual components are lost and I'm not sure what they should be, but seems to have been composed of a transistor, 2 or 3 resistors and 2 capacitors (my guess).
I think it would be interesting to share both the ROMs and the board's scan, so someone may be able to understand it better than me, or even have a complete board and can tell what are the missing components.
Another question is: can I make it work without the ls32? It seems to be decoding /CE and /OE to the 28 pin CHR ROM. Can I just wire the ROM to GND and make it always enabled or I may have problems?
Thanks in advance!!
PS:
Warning! 600dpi images!!
Board component side: https://drive.google.com/file/d/0B0OtMD ... sp=sharing
Board solder side: https://drive.google.com/file/d/0B0OtMD ... sp=sharing
I have found an old cartridge board on a very dirty deposit.
It was a real mess, and smelling really bad!!
I disassembled, cleaned, dumped the ROMs and scanned the board before reassembling.
The game is Dragon Fighter, an MMC1 game.
I got sad when I created a .nes file and no emulator ran it, but when I reassembled, it worked!!
I just say WOW!! The circuit board and components have taken a lot of abuse, and still work!!
What got my curiosity, is that the board has some connections from the MMC1's clone to something that should be some kind of CIC "stun" circuit.
The actual components are lost and I'm not sure what they should be, but seems to have been composed of a transistor, 2 or 3 resistors and 2 capacitors (my guess).
I think it would be interesting to share both the ROMs and the board's scan, so someone may be able to understand it better than me, or even have a complete board and can tell what are the missing components.
Another question is: can I make it work without the ls32? It seems to be decoding /CE and /OE to the 28 pin CHR ROM. Can I just wire the ROM to GND and make it always enabled or I may have problems?
Thanks in advance!!
PS:
Warning! 600dpi images!!
Board component side: https://drive.google.com/file/d/0B0OtMD ... sp=sharing
Board solder side: https://drive.google.com/file/d/0B0OtMD ... sp=sharing