This brings up the question: hasn't anyone ever thought about finding a closer solder point #4, or maybe for some reason, that I am not aware of, attaching a wire closer to the others will not work? In fact, there is an obvious solder pad for the reset button connection (point #4) right next to point #7!!Īs you see in the picture, original point #4 and the smaller solder pad next to point #7 show continuity in my DMM:
![scph 5501 mod chip scph 5501 mod chip](https://i.imgur.com/pLAfNF1.jpg)
I was surprised to find so many vias and solder pads for point #4 so much closer to the other solder points, by following the traces on board! Here is the original picture that shows all the solder points for my pcb (pu-22):
Scph 5501 mod chip upgrade#
Waiting for the pic12f508 ICs to arrive from China (in order to upgrade to mayumi v4), and I thought I'd see if I can find an alternative solder point for #4 cable, closer to the modchip loacation on board.
![scph 5501 mod chip scph 5501 mod chip](https://i.imgur.com/snGKb9E.jpg)
It does still incur that 3dB gain penalty when active - but since the media checks are carried out when the disc is running at x1 speed where it has a lot more gain margin anyway this shouldn't cause any problems. The chip that interferes with tracking the least is the latest version of PsNee - that entirely disable the outputs when it's not injecting data, so once the initial authentication check is passed should have no effect at all. This is in theory an inferior approach, but in practice it seems to work pretty much as well as any other chip on these boards.
![scph 5501 mod chip scph 5501 mod chip](https://www.picclickimg.com/d/l400/pict/165193522214_/Sony-PlayStation-1-Custom-Console-Tested-LEDs-SCPH-5501.jpg)
Since the specific chip you are using doesn't have the internal gating for WFCK (the design predates the release of the PU-22), it was connected using a wire link and then shorted out using the open drain output on the PIC. This effectively reduces the overall gain of the tracking servo by 3dB - under normal circumstances, the servo has more than enough gain margin to handle this without any adverse effects, but can start to cause problems when for some reason (like a weak laser) the overall gain margin is degraded. The problem is that this approach only lets the actual tracking error signal through 50% of the time, since the other 50% the pin is being used to send simulated wobble data. This is why these later chips use the WFCK signal for gating - it's high enough frequency to fall outside the passband of the tracking servo while being detectable by the wobble detection circuit. The overall effects of these changes is that the only remaining option is to inject the modchip data directly into the tracking error signal and rely on the filters in the tracking servo to get rid of it. On the later boards (PU-22, PU-23, PSone), most of the CD circuits have been collapsed into a single chip and the wobble processing is in there too - they also removed the physical connection that carries the signal to the mechancon CPU and replaced it with a data stream that was carried on the same wires used to communicate the "Q" subcode from the CD DSP to the mechacon. Since it was a completely different signal path, it didn't affect the way the CD player worked at all. On the earlier boards (PU-7 to PU-20), the signal used for the copy protection was picked off just after the optical pickup, processed and then fed into the mechacon CPU as a digital signal. So I'm guessing this is because I am playing it on a PAL console? I will try a japanese antimodhip game if I can find a disc to back up. PS: I was able to play a back-up ntsc-us CD of resident evil survivor which is known for its antimodchip protection.
Scph 5501 mod chip download#
I'd like to keep a folder with information about all modchips for the ps1 over the years - from oldcrow to mm3 and mayumi 4.ĭoes anyone have or know where to download such a source? Last but not least, I'm trying to find a source of wiring diagrams, alternative soldering points etc guide for the playstation modchips, but all online such sources seem to be deleted. Unfortunately I do not own an anti-modchip game to make a backup yet.
![scph 5501 mod chip scph 5501 mod chip](https://www.leadedsolder.com/assets/ps1-modchip-points.jpg)
I'd like to know if it is necessary to replace the current modchip with a modern stealth one, in order to play ant-modchip games. I've read somewhere that PAL region consoles equiped with old modchips can run anti-modchip backup games without problems. Second question is about old modchips and anti-modchip ntsc-u and ntsc-j games. (I suspect it is an oldcrow since it uses five wires on 4 IC legs - 1,5,6 and 8) Hi everyone, I know I'm a bit late in 2019, but I decided to clean up and modernize my PAL video game consoles recently, including the original playstation.įirst of all I would like to know what modchip is installed in my system, if anyone can recognize it from the pictures below