Contra (Japan version) has no screen after loading...

[szuping]

Contra (Japan version) has no screen after loading...

Contra (US version) can be executed normally

NESTang v0.12
Tang Primer 25K

[roundy07]

I suspect it’s a mapper issue.

Akumajo Densetsu does the same, the Japanese version uses a custom Konami VRC6 chip whereas Castlevania 3 in USA and Europe use MMC5

I know Japanese Contra uses a custom chip whereas the US version uses standard Nintendo mappers (US is mapper 2, JAP is Mapper 23 with the VRC II chip)

[szuping]

I suspect it’s a mapper issue.

Akumajo Densetsu does the same, the Japanese version uses a custom Konami VRC6 chip whereas Castlevania 3 in USA and Europe use MMC5

I know Japanese Contra uses a custom chip whereas the US version uses standard Nintendo mappers (US is mapper 2, JAP is Mapper 23 with the VRC II chip)

Perhaps as you described, I found that many "Japanese versions" of NES games cannot be executed, such as:
Ganbare Goemon! - Karakuri Douchuu
Ganbare Goemon 2
Salamander....

There are also many games with abnormal graphics...

[roundy07]

I suspect it’s a mapper issue.
Akumajo Densetsu does the same, the Japanese version uses a custom Konami VRC6 chip whereas Castlevania 3 in USA and Europe use MMC5
I know Japanese Contra uses a custom chip whereas the US version uses standard Nintendo mappers (US is mapper 2, JAP is Mapper 23 with the VRC II chip)

Perhaps as you described, I found that many "Japanese versions" of NES games cannot be executed, such as: Ganbare Goemon! - Karakuri Douchuu Ganbare Goemon 2 Salamander....

There are also many games with abnormal graphics...

All of those Japanese games you mention are Konami and use custom chips not present in US/EU releases

NES Cart DB is a great resource for looking up cart info
https://nescartdb.com

It would be useful if there was a list of implemented mappers on NESTang, the MiSTer NES core has this documented on their GutHub so something similar here would be ideal

[fjpolo]

These are the supported mappers rn. If anyone wants to test them and make a list, please add it to a new file MAPPERS.md in roopt folder in a PR

[szuping]

這些是支援的映射器。

In addition, I encountered an exception in exfat. The file list could not be displayed correctly. There were missing files or files could not be displayed. I replaced 5-6 TD cards, but it was not a TF card problem. As long as the file list was formatted to FAT32, the file list could be displayed normally. .