PS1 SPH 900 model reading issue

My PS1 is chipped and reads backups no problem at all, if not better than the original. However, when I stick an original in that I have not introduced a backup to the system, it fails to read the original properly unless I restart the PS1 (power off/on) with the drive open and then when BIOS has loaded, close the drive door and then it will play. However, this PS1 will read backups no problem what so ever, no matter what circumstance.

Anyone got a clue why this is? I can provide more information upon request.

Thanks guys.

 

My guess is that the chip is wired incorrectly, and is not shutting off the SCEx data read from the CD - with a copy, this doesn't matter since there is nothing there anywhere, but when you use an original you end up with two lots of SCEx data (one from the chip, and the other read from the CD) being sent to the mechacon and this results in a corrupt data stream.

When you power the unit up with the CD door open, it is presumably disabling the chip, and this lets originals boot because it's only reading the SCEx data from the CD.

Presumably when you start the console up with the CD door open copies won't boot? And I would also assume that you can't get original imports to boot at all.

 

Maybe you have a old crow 3 wire chip, and the modder haven't bridged the cpu pin ad the condenser for reading original disks.

 

Except it sounds like it's one of the chips that you can disable by powering the unit up with the CD drive open - which suggest it's Stealth / Multimode / Mayumi code, and that should be able to handle the one-chip systems like the 9000 correctly if it's properly installed.

 

hmmm...
i think you are right, i think the best solution is a pho of install from the OP

 

Hey guys thanks for the quick responses, here is a photograph, hope it will suffice, it is the best my phone camera can do =/


@TriMesh, NTSC-J actually load easier than original NTSC-U games. Have not tried PAL but I don't think it matters.

 

I think it's old rei 5 wire chip.
Photo don't show wire soldered on chip pins.
Can you check?
The yellow wire should go to pin 6 of the pic
The green on the right should go on the pin 7 of the pic
and the other green wire on the left (that near the cpu) should go on the pin 4 of the pic.

Also install it's a disaster, a really bad job.

 

That looks like the 3 wire + jumper install - the green wire is just a jumper and doesn't go to the chip at all.

Red = pin 1 / Black = pin 8 / Yellow = pin 6

But I've got to agree with master991 here - it's a mess and you would be much better off just removing it, cleaning up the board and installing a new one. Something like a MM3 or Mayumi 4.0

 

If green it's the wire (and i think now, loking better) it's worse than I thought.
Remove that shit and, at least, re-wire all better.

EDIT: Here's the problem, the link wire. It's soldered in the wrong point. That's why works only backup.
Also that's why i've thought that code is old REI 5 wire

 

Haha boy do I feel bad about my soldering skills now

Thanks for the answers guys, I'll look into a different chip.

Can you recommend one that will allow me to play anti-mod games without issue?

 

Well, if you did it yourself, it's not too bad, I guess - but if you paid for it I would ask for my money back.

For a full stealth on the PU22/PU23/PSone I would recommend either MM3.0 or Mayumi 4.0 - both will boot anything you throw at them, and are very similar in installation terms. Personally, I tend to use MM3.0, but mostly because it's been ported to the cheaper and more readily obtainable 12F629.

I would also recommend you get some thinner single-stranded wire, since it will make life easier for you.

 

I get the 12c50x for cheaper than the 12f629.

Also, depends on region for the psone - you don't want to use those on a pal psone.

 

I guess it depends on where you are - stuff that is in current production is very cheap here, and the stuff that's been discontinued much less so. The last bunch of '629s I got cost 650 RMB for 500 (about 13p each) - so at the rate I use them I imagine they are going to last a very long time. And, strangely, PAL playstations are not at all common here, despite HK being a territory that uses PAL.

 

You can still use this if you want. You need only check the link wire. You have soldered on the wrong cap.

 

I think I'll just pick up a new chip from Bad_Ad84 instead, I've got another PS1 that I can just stick this in (or swap the boards, whatever). Would prefer to have a proper chip since I have absolutely no idea what is on this one. It works fine but, I would prefer a newer/better code one.

Thanks again guys for the responses.

 

It's a standard oldcrow modchip. It does its job well but no stealth tecnology
Some tips from me, i hope they can help you.
Buy awg30 wire, strip as little as possible and cut wire short as possible.
Clean tip of solder and be careful with shorts or cold joint. Good luck.