Difficulty installing on the Japanese SCPH 1000

[godmanpicoli]

I have already checked the installation of the wires on the Arduino Nano and on the PS1 board. I cannot start games from another region without the PS screen changing colors. Some games freeze on the PS screen. However, I can run the CD-R with the PSX BIOS Dumper.
Japanese games work normally.

Arduino Nano 328PB Fuses: H: DF, L: EE, E: FF
PS1 SCPH_1000 PU7 BIOS ver. 1.1 CRC 3539DEF6 checked with PSX Bios Dumper

[kalymos]

for european games it's normal that it doesn't work very well, the internal clock of japanese ps1 doesn't allow it.
there is a mode to change the clock, at the end of the first page of the wiki you have a link to this world

[godmanpicoli]

I forgot to mention that I used American games, even with American games do I need to change the PS1's internal clock?

Where can I find the link to modify the internal clock?

[kalymos]

https://github.com/L10N37/PSXTAL if it's a PU-7 I'm not sure it works.

[godmanpicoli]

https://github.com/L10N37/PSXTAL if it's a PU-7 I'm not sure it works.

For American games, is it necessary to change the internal clock?

[kalymos]

Sorry I have never used this mod, I am primarily concerned with psnee. but I think I have already heard of this problem, only I do not remember in which forum, maybe psxdev

[godmanpicoli]

Sorry I have never used this mod, I am primarily concerned with psnee. but I think I have already heard of this problem, only I do not remember in which forum, maybe psxdev

I replaced the Arduino Nano 328PB with an Arduino Pro Mini 328P and it worked normally.

[kalymos]

Glad it works for you, but I thought the only difference between these two was the package.
I absolutely have to do a global test campaign again.
by the way thanks for the screenshots it helped me understand what is used to detect the BIOS.