I used a pickit3.
Hopefully you find a way to program it with yours.

If not you can buy a ready made one, they're pretty cheap.

Unfortunately I don't think the ATTINY is not suitable for this. To read data and command from the PlayStation I need 2 SPI modules, which the ATTINY doesn't have. I tried bitbanging it on an arduino nano (1 SPI module), but it was unstable. If you feel like doing assembly then *maybe* it could be d...

I have a wiki now with guides on where to solder the mod.
https://github.com/pyroesp/PlayStation-1-Reset-Mod/wiki

I could try looking into making this 'safe for memory card' but that would add complexity to the code. I can probably do a simple 'detect if memory card written to' and wait to reset after it's finished. The only problem I see here is that the PS1 will get reset in between writes to the memory card ...

Below is the new board render. Pull-up resistor is not needed so the BOM is reduced to a capacitor and a microcontroller: https://raw.githubusercontent.com/pyroesp/PlayStation-1-Reset-Mod/master/pictures/mod/pcb%20-%20front.png https://raw.githubusercontent.com/pyroesp/PlayStation-1-Reset-Mod/master...

For those interested I made a (hw) reset mod :
http://www.psxdev.net/forum/viewtopic.php?f=47&t=3494

I made an open source reset mod for the PlayStation 1. I made this because I have a PSIO and I didn't want to get up and walk to the reset button. The mod detects button presses from inside the PlayStation 1 and will reset it whenever a defined button combination has been pressed. For now the button...