nesdev.org

Okay, I got PRG working! Looked back at my manually diagrammed pinout for the PRG socket on this board, and noticed that pin 31 on the socket was a /CE line coming from MMC5. So I took EPROM pin 22 out of the socket, and ran it straight to that line, and voila! Working PRG. CHR looks a little corrup...

Feels like time for another sanity check. Seems like I'm struggling with understanding the wiki about the mask ROM pinouts. I mean, I thought I understood it, but things aren't working -- so can anyone do a sanity check for me? Can you quote a response and fill in these gaps of where the pins go for...

Okay, despite my automatic verifications that run at the end of every chip burn, I just popped my PRG ROM back into the burner and it does not verify... So I'm blanking that chip, and will try a reburn, and if that doesn't work, I have another M27C1001 onhand to burn also. Fingers crossed, something...

Okay, so I've reinstalled the EPROMs again, and this time I made jumper wires using machine pin socket ends on them, so I can remove them easily. I'm still getting the same weird behavior, inconsistent video output, occasionally a cyclic hum. These EPROMs did verify properly after burning, so I'm 99...

https://i.imgur.com/VG0qe1F.jpg Okay, so some good news. PCB and MMC5 seem to be undamaged and working with the original mask ROMs installed in sockets. I realize we were trying to troubleshoot EPROM connections, but this is more of a sanity check for me, so I appreciate the suggestion (to retry th...

Do not let inputs float unless the datasheet specifically says so (with something like "open collector" or "open drain"). Usually you want to ground unused address inputs, or just double up the ROM and connect them normally. Okay, but I'm referring to the pins on the MMC5 that a...

Have you tried flashing L'Empereur to your PRG and CHR flash chips to make sure your board is correctly modded to ETEPROM? I don't have a 256KiB EPROM at the moment for that experiment -- I could desolder my chips, though, and retest the original mask ROMs. I contemplated putting sockets in on the ...

After completing my Lupin reproduction, I've started attempting to make myself a reproduction of the Simcity prototype. I purchased a Japanese Famicom copy of L'Empereur to use as my donor. This one uses an HVC-ETROM-02. There are quite a few differences between the prototype board and my donor boar...

It is equally safe to connect the EPROM's /OE to ground or to the mapper's /CE output. Either way, it'll work the same way: the ROM will drive the data bus when /CE is low. (The ROM has two inputs: "Chip enable" and "Output enable". When the chip is enabled, but output is NOT en...

Follow-up question, though: On the previously linked wiki, /ROMOE does not appear to be remapped, as in the PRG column, that's where A16 is expected, but /ROMOE isn't remapped anywhere -- I'm assuming it would make sense to just jumper it to /CE in this case, so that its outputs are enabled when the...

:oops: Don't I feel embarrassed! I was looking at the wrong datasheet (suppose that's what I get for trying to work on multiple projects at once...) Now that I've pulled up the datasheet again, it's obvious that the highest address line is A16 -- I'm still glad I asked, though, because had I continu...

Good day! If you can't tell by my username, I'm a Lupin geek. I have the original Famicom cart of Lupin Sansei: Pandora no Isan (it's an epoxy cart). I recently purchased a Dragon Slayer IV Famicom donor cart because it has the Namco 108 mapper/protection chip already installed on the cart, and happ...

Minor update: Actually, it seems like maybe the database service is off. Seems like everything that would be fetched from the DB is failing to render on the pages. Perhaps that's why there are long load times and timeouts, and no data displaying.

I'm sending him a PM too, but I thought since he frequents this site, someone else may know him or what's going on with the site. Seems like the server is being overwhelmed, but things were looking bad since the error reported that a timeout occurred for a file (and revealed the full Windows filepat...

Someone told me that the game was only 50% complete. Are we sure that the game is even playable? My understanding is that there was a bug that prevented the game from being completed. I also understood this to be an incomplete prototype that had lots of unused graphics (unimplemented, I believe) fo...