I'm trying to socket the prg chip on an EWROM board- HVC-EWROM from a Sangokusi Ii cart to be specific. It does not seem to work. I'm wondering if I am missing something.
1. reasonably sure the board is good- was able to boot the game before removing the stock prg.
2. reasonably sure my eprom is good and appropriate- using 27C020
3. reasonably sure the data is good - dumped the stock prg and compared it with a good rom and bootgod db and wrote the chip and read it back and everything seems right.
4. wiring:
pin 1 up
pin 2 -> hole 24 (a16)
pin 24 -> hole 16 (gnd)
pin 30 -> hole 1 (a17)
just get gray screen at power on. I'm primarily using a famicom to try it out but also tried in a NES with the gyromite adapter.
Any ideas what the issue might be? I'm about at the limit of my diagnostic abilities here.
1. reasonably sure the board is good- was able to boot the game before removing the stock prg.
2. reasonably sure my eprom is good and appropriate- using 27C020
3. reasonably sure the data is good - dumped the stock prg and compared it with a good rom and bootgod db and wrote the chip and read it back and everything seems right.
4. wiring:
pin 1 up
pin 2 -> hole 24 (a16)
pin 24 -> hole 16 (gnd)
pin 30 -> hole 1 (a17)
just get gray screen at power on. I'm primarily using a famicom to try it out but also tried in a NES with the gyromite adapter.
Any ideas what the issue might be? I'm about at the limit of my diagnostic abilities here.