PlayStation MM3 issues

Hey guys, I have a SCPH-7001 NTSC-U PlayStation and I just bought an MM3 chip from Bad_Ad84. I'm getting extremely frustrated installing this thing. I already have a modded PS2 that can play imports/backups so really I'm doing this just for shits and giggles, but regardless, it's getting quite frustrating, heh. I have never done a PSX chip before, and I'm not the world's most experienced with a soldering iron, but I've successfully done plenty of other mods (Xbox/Wii/Saturn modchips, NES/N64 RGB mods, DC piggyback BIOS, etc.) and this one is really quite easy. I'm starting to think I might have gotten a dud chip or something. Is this the right diagram for it?



I've resoldered this chip 3 times and every time I get the same thing: all discs, even official NTSC-U discs, either go to the music CD player menu or the "Please insert PlayStation CD-ROM" screen. If I remove the chip, it works fine booting official NTSC-U discs.

For each point in the board, I've followed a trace to a connecting point and used a multimeter to test continuity between that point and the leg on the chip itself. All of them test fine for continuity. I've looked all over each point and I can't find anything that could be shorting.

As there were no instructions and I've never used a chipped PSX before, there's nothing special needed right? Just pop the game in and turn it on, correct? (After all, it doesn't work with official NTSC-U games either...)

(Yeah, some of these joints could be more nicely done, but it's 3AM and I'm just trying to get this damn thing to work...)

 

I think the reasons for the chip not working is:
1) Solder Joints (Solder Points 1,7 seem to be a bit off)
2) The pic has programmed with the MM3 PAL or NTSC-J hex.
3) Dud chip

 

Well, I've resoldered this thing in and out three times, and they're only as ugly as they are since I was getting frustrated on the third installation and didn't bother to clean up the solder on those points, but I went ahead and cleaned up/resoldered those two points at your suggestion and still, nothing.

I wasn't aware that there was a different hex for each region, but now that you mention it there obviously would have to be based on how these things work. When I ordered it, I didn't specify the region and he didn't ask, so I perhaps got PAL or NTSC-J chip. I'll ask him. Thanks for your response.

 

Try adding a decoupling cap, worked for me on fussy consoles no end of times.

 

Bad_Ad84 swapped the chip out for me with a Mayumi v4 instead and it works perfectly. Thanks for the help though!

 

That's why i never liked the MM with int_osc fuse

 

Think I am going to stop offering MM3, never have any Mayumi's cause problems.

 

Haven't had problem with MM3 I have a total of 4 USA PSX/PSOne with MM3 installed. Maybe it varies with region?

 

No, 99% of times problems are pic itself or programmer that makes mess with osc value for example.

 

It's REALLY hard to find reliable information on PSX/PSone modchips anywhere on the internet nowadays, honestly if I had known the differences between the chips (and knew that Bad_Ad84 was offering Mayumi v4 chips), I would have gone with the Mayumi v4 to begin with. I know wire count is traditionally an important thing for modchip vendors but I think at this point anyone who's doing PSX chips is probably an enthusiast who isn't afraid of wire count (and the PSX is super easy to do anyway). Are the MM3s compatible with more/different systems? If so, I don't see a good reason to keep them around (just my opinion for what little it's worth).

 

MM3 it's copy paste of mayumi V4, they uses the same exact code, but the mm uses one wire less because use the internal oscillator of the pic. Mayumi it's better because it uses the modbo of the psx to sinc with the chip itself.
Stupid slogan of the era say less wire are better (because modder, at the time, wanted to convince the people that old crow 4 wire chip it's better, the true it's they do the job way fast with only 3 wires LOL), that's absolutely not true

 

It's not the programmer nor the PIC. I am getting the one I sent back to confirm it was programmed correctly or not. But any problematic consoles I've had, install a mayumi and its worked fine.

I even questioned you when you said it was better - as at that time id had no problems with any mm3 chips. But I've changed my mind now and install mayumi v4 by default.

Going to test v2.1 on a scph-100x soon too.

 

Some batch of pic in the past (maybe in the present too? ) had problem with the internal oscillator timing.
Also, some programmer erase or create a mess with the osc call value.

Mayumi V1 it's the exact code of the MM 2.X, they uses external osc.

I'm interested on the mayumi V2 [they use the 1c84 pic], it doesen't works on a 12f84\a. It is simply the best modchip for psx.

 

I have some 12f84 (not a) chips.

also, its not the programmer or the osc cal value being messed with. I don't use a cheap or buggy programmer. Int osc issue is possible, but I will find out soon when it gets back to me.

When I say problem consoles above, I have used the mm3 chip that didn't work in another console without issue.

 

Can you test mayumi v2 on 16f84 (not a)?

I don't know why it doesent worked, mistery of electronic

 

Thats exactly why I have them, will do it soon.

 

Wow! great!
Have you receveid my PM with Mayumi V5 hex? You haven't answered me....

 

I dont seem to have a PM from you =/

Someone else did send me the hex though. I still need to figure out the wiring for Mayumi v3

 

Would you guys be willing to share mayumi hex's with me?. Im having a bit of a hard time finding them

*Found*
Mayumi v1.1
Mayumi v2.1
Mayumi v4.0

just need v3 and v5

 

really, strange, maybe i've confused and 'ive sended the PM to another user or maybe i 'haven't sended
Sorry

BTW my friend time ago tell me that V3 uses the same install of mayumi V4.

EDIT: ill be waiting for the mayumi V2 results