PS1 Modchip on ATtiny13

While looking for any Hex files I may be missing for the PS1 for modchips, I came across this:

http://code.google.com/p/modavr/

Anyone ever seen this before or tried it?

I looked at the .asm file and it only lists 4 pins being used, and it says "a version of classic Sony PS1 (PSX) modchip" on the site so unfortunately it probably doesn't even support stealth. Lame. It could have been great if it supported it.

I got an AVR programmer but no ATtiny13 chips to test it out myself currently. I'm very surprised I've never come across this before...

Edit: Assuming it isn't stealth, wouldn't adding a switch between pin 5 & 6 like some other chips make it stealth?

 

You can kind of make it auto-stealth. The mod chip works by ramming down the codes like SCEA to trick the console into "reading" the CD-R as legit and play games. After a while (not sure, 10 seconds?) have the ATtiny go to sleep and stay in sleep. Many anti-modchip games checks at later time if the console continues to get code which would indicate active modchip and stop playing. By making ATtiny go to sleep after a while, it will prevent many anti-modchip games from detecting the modchip.

 

Also stops multi disc games running. Thats why stealth chips have one pin connected to lid switch.

 

I know how stealth works and all, my point was that I had never seen a port onto a ATTiny13.

 

I've seen it, but never tried it.

It's basically just an AVR port of the "Old Crow" code - so it has no stealth capability and only outputs in the NRZ format that the old boards use.

As a result of this, it can only be installed on the later boards (PU-22, PU-23 and PSone) in the "3 wires + link" mode. This does work, but it also interferes with the tracking servo somewhat and makes it harder for the CD mech to keep lock.