Donkey Kong - Original Edition NES Cart

i tried to build a DK Original Edition

DK Original Edition Infomation
PRG 32k
CHR 32k
Horizontal Mirroring
iNES Mapper 3 (74LS161)

i used SNROM Game (Paperboy)
2x 27C256 (32k EPROMs)
Horizonal Mirroring + SL Connected

soldered but the game shows only a white screen

i need help, why it doesn't run?

of course, i mean CNROM

SNROM is mapper 1. Paper boy uses CNROM which should be right. But make sure you soldered the chips in the right way and such.

I suggest reviewing this thread: http://forums.nesdev.com/viewtopic.php?f=9&t=9220