Strange PSOne mod chip behaviour - can't play music CD!

I recently installed a Mayumi v4 mod chip inside a USA PSOne (SCPH-101 PM-41 (2) (A)). The code was burned on a 12C508. CD-R copies and originals work great, but for some reason, music CD's don't! The drive spins up the CD .. and spins it.. spins it, and then stops! A second later it spins it up again. This continues on without recognizing the original music CD.

When the modchip is disabled. The PSOne detects the music CD almost instantly and plays it!

I acquired some 12F508 chips, and tried again. Mayumi V4, MM3 .. all have the exact same problem. Anyone know what this could be?? Here's the wiring diagram I used for the Mayumi:

 

Maybe the audio CD(s?) you picked happens to be a mixed mode disc, that the PS then sees as a data disc (and thanks to the chip as a Playstation data disc) and tries (and fails) to boot from it?

 

I tried 2 different CD's... they're both old CD's from the early 90's. I doubt pet shop boys and the old classic queen is mixed mode.

 

Turn on the PsOne with no disc, let it load to the BIOS. Open the drive door, and insert music CD.

What does that do for ya?

Good 'ole Dino Mode flubbin' everything up.

 

Same thing... Just spins and spins.

 

Can you take a few pics of the install?

 

Well I'll be damned! Thank you Zer0 (awesome modchip seller on this forum) for testing out your PSX with the Mayomi V4 chip. Audio playback does NOT work with his mod chip!!

How am I the first one to notice this!?!?

Voultar, are you sure you got audio playback working for you??

 

I had a small snafu with one of Voultar's chips once, mostly because it was exposed to the elements thanks to the USPS in the South. I rechecked my connections and got it working on my 9000 model. Odd thing for mine is that I have to reset the console in order for it to play backups.

So for PSOnes, is the Mayumi v4 okay or is the OneChip better?

 

???

The modchip works for backups and originals. It just doesn't play MUSIC CD's!

 

Depends on which territory your console is - the OneChip is designed for PAL consoles, and will patch out the territory check in the boot ROM. The US version never had this check in the first place, so there is no point in connecting the boot ROM patch lines.

If you have a US console, then the Mayumi will work fine.

Have you tried with multiple CDs? Some of the copy protected CDs have a hidden data session on them and a modded PS1 will attempt to boot them as if they were PlayStation games - which obviously doesn't work very well. I also had one "protected" CD that wouldn't play on a PS1 at all (not even a unmodified one) - it also locked up the CD player in my car and had to be force ejected.

 

Yes. I tried 2 different CD's. Not sure what music CD zer0 tried.

You are able to play Music CD's on your modded PS1??

 

You have to cycle through the various DINO modes in order for music CD's to work, I'm pretty sure the stricter ones break Audio CD playback.

You have to keep in mind, the Mayumi V4 was never designed to operate with the PsOne.. It does work, but it operates in its stricted mode, 24/7.

With the PsOne, there is no hook (reset) to disable the mod-chip or cycle through the DINO modes. You would hold the reset button to cycle through the various Dino Modes, and to also ultimately disable the chip. There are tons of them..

What are DINO modes? They are the different timers configured in the mod-chip to circumvent Anti-Mod technology found in games. It was coined after the game Dino Crisis that employed what was at the time the most sophisticated Anti-Mod technology of any PS1 game.

Old Crow and classic 4 wire installs have no problem with music CD's.

Seems like the Mayumi 5.1 (PsONe only chip) had a way of cycling through the modes by opening the drive door. It relied on the PICs oscillator and didn't pull clock signal from the system much like the Multi-Mode III. Otherwise, all of the other stealth chips operate full blast on the PsONe.

It's been a long, long time for me people.. That's a hat I hung up long ago.

 

So is that why my console has to be reset in order to boot backups? Interesting.

 

Pretty sure mm3 and Mayumi v4 don't use "Dino mode" by default. That is a manual mode to set a delay, rather than detecting when it should shut down sending the SCE* data.

Believe this is the correct readme:

If you have another, please share. Information on the mayumi chips is much harder to find than mm3 and such.


Edit:
Scrub all the above, just reread your post and it seems we are saying the same thing. I just misread your post.