NES Salamander (Japan)

[splash5]

Is there anyone dump "Salamander (Japan)" successfully?
I always got first bank dumped (repeat for 8 times).
Seems VRC3 can not switch bank well, but it runs no problem on real hardware.
Here is waveform I logged with logic analyzer on real hardware.

[nsx0r]

can you try replacing the line at https://github.com/sanni/cartreader/blob/master/Cart_Reader/NES.ino#L3015

write_reg_byte(0xF000, i);

with this line:

write_prg_byte(0xF000, i | 8);

[splash5]

I tried write_prg_byte(0xF000, i | 8); and it works! Thanks a lot!
Also tested mapper 68 and works well too, save looks not corrupted.

So the problem seems belong to /ROMSEL and M2 switching... (too fast for VRC3 I think)

[nsx0r]

possibly a timing issue, or bit 3 must always be set for some reason?
you can test this theory with write_reg_byte(0xF000, i | 8); and write_prg_byte(0xF000, i);

[splash5]

I have tested dumping with write_prg_byte(0xF000, i); and no problem at all.
Dumping with write_reg_byte(0xF000, i | 8); is not working. So this must be a timing problem.
According to here, set bit 3 of $F000 reg will map 0x1c000-0x1cfff to CPU address $c000-$cfff.
But not affected if reading last bank from $8000-$BFFF, so not ORing 0x08 with bank id is ok.