New Question! magic 3.5 (3.0 code)

[jason63]

Please Help!
I have a ps2 v7.
Magic 3.5 (3.0 code)
Would like to put a switch on it but points are different.
can you please help?

I want to play my vice city!!

Picture of the exact chip I'm referring to is here.
http://www.neoasic.com/mod-chips.htm

[jason63]

Here is a better picture of the chip I installed.

[jason63]

I've been reading the post on the swich for the magic 3.0
I have the magic 3.5 (same code as 3.0)
Wish to install a switch.
am having trouble determining the points for the switch and where to cut the ground.

basically: I want to find the 5V and cut where it goes to on the pcb (don't know where that is yet)

1. get a 3 pole switch one side 5v
2. opposite side gnd
3. center where the 5V was going to on the pcb board.

Is this right?

[jy96]

I thought it was switching the 3.3v line to ground would "turn off" the chip. I remember someone posting that grounding the 5v will freak out the laser.

The magic 3.5 is basically magic 3 with the clip, right? You can set the switch to ground the MCLR pin. You can trace this pin by going from the lower right leg(based on your picture) to the 5v point.

I do not have a magic 3.5 so the above are assumptions based on hearsay. Use it at your own risk. I have a magic 2 but the magic 2 has a separate point for the 3.3v.

[jason63]

Thank You I am having problems tracing it back.
5v goes to the 3rd one from the left as it should but it also should goto the mclr pin but I can't find the point to cut the trace & put the switch in.

[Kid Buu]

Could someone please mark the points on the magic 3.5 picture which should be cut and lead to the switch? Because I also have a magic 3.5 and would like to place a switch on my ps2.

[jy96]

That's kind of hard because according to jason63's picture (above). The tracks are hidden in-between or below the wafer which makes it hard to tell where the tracks are from a picture. You should be able to make out the tracks by looking at the actual chip itself under direct light.

If you can see the tracks then: trace the track from the lower right leg(based on your picture) and/or upper third right leg on the pcb. They should converge. Set the switch to ground the MCLR pin. Cut the track between the lower right leg and the converging point. Solder the switch like this:

1. one side converging point.
2. opposite side gnd.
3. center right lower leg.

Once again I do not have a magic 3.5 and these are only my assumptions.

[Kid Buu]

Where is the MCLR pin located? And yes, you're right about the tracks. They're located at the back of the chip, maybe I can make a picture of it.

[kamaleon]

jy96 you are right on the theory... how ever the mclr track to 5v is tricky on the M3.5

the 5v track feeds pin 3, 4, 28 (mclr) i havent found an isolated point that is just the mclr and 5v.

This M3.5 waifer may have tracks not only on top and bottom but maybe also in the middle?

the only isolation i can come up to this point if lift teh mclr (pin 28) from the board and came that the converging point..

tricky hu?

3.5 is easy to install but a pain to get around the switch.

has anyone got anyhting workign for the M3.5 yet?

[Bgnome]

it seems that your diagram will work, but you would need to lift pin 28. i have pretty good reason to believe that the 3rd via on the 5v track, the one near pin 1, actually connects to a track under the IC and connects to pin 28. i dont have a 3.5 so someone would need to confirm this and make the cut RockerNJ noted earlier. just check for continuity between that point and pin 28 after the cut. if it doesnt work, you could easily repair the cut by shorting that point with another via on 5v track.

this is RockerNJ's cut. ignore the bit about pin 1..
http://www.ps2newz.net/forums/attach...=&postid=30642