Worklog PS2 Trimming Initiative

Gman

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This is my worklog documenting the PS2 motherboard for completeness and hype. I've had a board running on custom regulators for a little while now and the voltage documentation is in a good state. However, I have a few more tests to do before actually trimming a board including measuring current on each individual voltage reg, and video stuff.

I've compiled a 79001 compendium and a lot of work has been done on it to figure out the motherboard. It's such a valuable tool that even without having done any trimming, I am pretty confident on how small it can be made.
Voltage layer peek:
79001VoltageLayer_zpsebrscou2.JPG


Voltage data:

Conditions:
Stock PS2 79001 (No disc drive)
8.5v Power Supply
Free McBoot Memory card
Lexar 64gb USB drive
DS2 controller
Composite Video

PS2 Menu:
Power Supply: 8.7190 V
Total Current: ~1.033 A

Onboard Regulators:
3.4635 V 271.7kHz (Top side)
1.23156 V 277.8kHz (Top side)
2.5091 V (Top side by power plug)
1.72072 V (Top side)
4.9888 V (Top side by 8pin dac)
4.9873 V (Top side USB)
2.5267 V (Bottom side by Controller 1)
1.81214 V (Bottom side by Controller 2)
5.0110 V (Bottom side USB)
1.79425 V (Bottom side near video encoder)
3.5167 V (Bottom side near video encoder)

In Game (GTA3)
Power Supply: 8.70 V
Total Current: ~1.07-1.1 A

Conditions:
PS2 79001 Custom Regulators (No disc drive)
8.5v Power Supply
Free McBoot Memory card
Lexar 64gb USB drive
DS2 controller
Composite Video
Disc drive laser and motor ICs removed, all onboard regulators removed

PS2 Menu:
Power Supply: 8.6820 V
Total Current: ~0.902 A

Custom Regulators used:
PTH08080:
3.5422 V
1.22585 V
2.5480 V
5.0435 V
1.79770 V
Original 8 pin regulator powered from 3.5 V PTH08080:
1.68171 V

In Game (GTA3)
Power Supply: 8.6820 V
Total Current: ~0.9-0.97 A

Conclusions:
Stock PS2 Power Consumption: ~9.57 Watts (In Game)
Custom regulator PS2 Power Consumption: ~8.42 Watts (In Game)
Stock PS2 uses ~1.15 Watts more than modified motherboard

Number of Regulators:
Stock PS2: 11 voltage regulators
Modified PS2: 6 voltage regulators (As of now)
 
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cheese

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Is the 79001 much different than a 70007 (or at least I assume that is the rev from the stuff I sent you), or are they pretty similar? Do you think they made huge changes between the different slim models, or is the 79001 just the most documented of them?
 

Gman

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Is the 79001 much different than a 70007 (or at least I assume that is the rev from the stuff I sent you), or are they pretty similar? Do you think they made huge changes between the different slim models, or is the 79001 just the most documented of them?
The models are all pretty far apart. On the later slim models Sony combined a bunch of the ics in one ic since they switched to 90nm. IIRC the 90000 appears similar to the 79001 but is not compatible with freemcboot (or at least not as easily). So yeah, the 79001 is the best for portablizing. The only thing that remains mostly the same throughout the models is the video encoder.
 

Bakuku

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Good job @Gman .
But holy shit... 6 regulators!

While you're at it, could you test something for me please?

http://www.gamesx.com/wiki/doku.php?id=av:playstation_2_rgb_sync

This guy found H and V sync on the PS2 slim boards. But something about the RGB signals being digitized?! Try if you can get a 480p VGA signal, please. I remember Ashen's PS2p but it had an interlaced video signal because of the sync stripping on green if I remember correctly.
 
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Gman

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Good job @Gman .
But holy shit... 6 regulators!

While you're at it, could you test something for me please?

http://www.gamesx.com/wiki/doku.php?id=av:playstation_2_rgb_sync

This guy found H and V sync on the PS2 slim boards. But something about the RGB signals being digitized?! Try if you can get a 480p VGA signal, please. I remember Ashen's PS2p but it had an interlaced video signal because of the sync stripping on green if I remember correctly.
When I mentioned having to do more video testing, this is kinda what I was talking about :)
 

Shank

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I don't know much of anything about the PS2, so these may be dumb questions:
-Is there possibly better ways to load games than Free McBoot? Because IIRC, the PS2 only supports USB 1.1, which is kinda slow. That would open the door to trimming other revisions like the 90000.
-If we had the ability to boot games on the 90000, would it be a better one to use for portables? Because you mentioned a die shrink and combining chips. Could that mean less power consumption and/or a smaller trim?
 

Gman

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I don't know much of anything about the PS2, so these may be dumb questions:
-Is there possibly better ways to load games than Free McBoot? Because IIRC, the PS2 only supports USB 1.1, which is kinda slow. That would open the door to trimming other revisions like the 90000.
-If we had the ability to boot games on the 90000, would it be a better one to use for portables? Because you mentioned a die shrink and combining chips. Could that mean less power consumption and/or a smaller trim?
OPL isn't perfect, cut scenes tend to be very slow but in my experiences gameplay is the same for most games.

I don't think a 90000 would be any smaller of a trim, it looks essentially the same but the controller/mem card ports hang off the motherboard. There have been people working on HDD loading and disc drive emulation but nothing definitive and most likely never finished.

Having HDD loading or disc drive emulation would be sweet but you won't be able to get the motherboard nearly as small, there are trade offs. But we can agree that there is little purpose in trimming the board with a disc drive because the board can be made the diameter of a CD with little effort.
 
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Bakuku

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@Gman

I recieved my PAL 79004 board today. Other then being PAL are there any major differences between 001 and 004?
Is there anything I can do to help besides sanding this Motherfucker "It was hard to acquire and still want to make a portable out of it :)".
 

Gman

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@Gman

I recieved my PAL 79004 board today. Other then being PAL are there any major differences between 001 and 004?
Is there anything I can do to help besides sanding this Motherfucker "It was hard to acquire and still want to make a portable out of it :)".
Can you share a clear photo of the motherboard? I could probably spot any differences (if any).
 

Gman

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At first glance it looks identical with the placement of the ICs. Upon further investigation, the power supply circuitry is different. It's hard to tell from the pictures without measuring, but it looks like it is missing the second 2.5v reg, the 1.8v reg, and the 3.5v/1.8v reg that is present on the NTSC 79001.

Care to measure the voltages I have identified on here?
palvoltage_zpszfib7bom.JPG
 
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Bakuku

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@Gman

Fan and DVD drive connected.

Blue: 1,772v
Black: 3,445v
Green: 2,514v
 

Gman

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@Gman

Fan and DVD drive connected.

Blue: 1,772v
Black: 3,445v
Green: 2,514v
Interesting.. Seems they ditched the 1.7v and 1.8v and met in the middle.. I think that's what I shall do with custom regulators. 5 regulators guys!! Same as the Wii!

Edit: Seems I labeled it incorrectly. The red square was labeled around pin8, it should be around pin 1. Can you measure the voltage on pin 1? It should be 1.772v. Also measure the resistance between the Red and Blue identifiers, I am betting they are directly connected.
 
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Bakuku

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@Gman

Red IC leg 1 = 1.783v

resistance between Red IC leg 1 and GND is 56Ohm no powerplug and standby
resistance between Red IC leg 1 and Blue is 36Ohm under load
resistance between Red IC leg 1 and Blue is 4.715kOhm no power plug connected
resistance between Red IC leg 1 and Blue is non measurable in standby
resistance between Blue and GND is non measurable in standby
resistance between Blue and GND no powerplug is 4.705kOhm

all this was measured with DVD drive and Fan plugged in, not connected to TV and bare PCB on table with a PSOne slim power supply "don't have ps2 brick"
 

Gman

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@Gman

Red IC leg 1 = 1.783v

resistance between Red IC leg 1 and GND is 56Ohm no powerplug and standby
resistance between Red IC leg 1 and Blue is 36Ohm under load
resistance between Red IC leg 1 and Blue is 4.715kOhm no power plug connected
resistance between Red IC leg 1 and Blue is non measurable in standby
resistance between Blue and GND is non measurable in standby
resistance between Blue and GND no powerplug is 4.705kOhm

all this was measured with DVD drive and Fan plugged in, not connected to TV and bare PCB on table with a PSOne slim power supply "don't have ps2 brick"
Hard to know where the voltage lines are connected in the pictures but this is good news.
 

Bakuku

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Hard to know where the voltage lines are connected in the pictures but this is good news.
Glad I could help!

If we could also find the IDE pins on this motherfucker?! Dear God...
 
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Gman

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Left: 90001 Right: 75001
The 90001 has less trimming potential than 79001. Even squaring off the board will require relocating the controller/mem port1 to the traces as well as the pull up resistors. The 90001 has an internal AC power circuit board and has a different power circuitry than previous models. The 75001 has many more ICs and is not worth trimming.
 

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