Electronics > Beginners
Recreating mod chip designed for the Playstation 1.
Katcher:
So before I begin I apologise if I've posted this in the wrong section and for the size of the attached image. This just seemed the best place to ask from my understanding.
I'm looking to recreate a modchip as close as possible to one I bought, and accidentally threw out , from Obscure Gamers a year ago. Sadly that site shut down and the seller pointed people to ASSEMblergames, a site of which the mods and admin have seemingly abandoned making it impossible to sign up to as it requires them to authorise your account after email verification. This has made communication incredibly difficult to purchase a new one and rather than trying to find another seller I've decided to try and recreate the modchip myself.
All I know from this image (and from memory) is the fully assembled modchip is a 15mmx15mm (or 20mmx20mm) PCB with 8 solder points(if the image isn't clear enough the 4 on the left are labelled 1 to 4 from bottom to top and 5 to 8 top to bottom on the right) that connect to each pin on the chip used and a SMD component unknown to me. One of the big issues with recreating this chip is trying to figure out what chip is being used(or usable equivalent that is able to be programmed with the right Hex File required for my SCPH-5552 PAL PlayStation), trying to figure out what that other SMD component is and what it's purpose is, and how to program the chip. Having never created a PCB before now, advice on how to create one would be nice not only for this but for also any future projects.
My reasoning for wanting to recreate the modchip this way instead of finding one from another seller is solely down to how it's presented. It's nice and elegant and a much better solution than just taking a chip, soldering wire to each leg, then soldering the other ends to the correct points on the PS1's motherboard. Any help is appreciated and hopefully I've made enough sense and if this was posted to the wrong place...sorry.
KL27x:
There's 99.9% chance that "the chip" on there is a microcontroller which needs to be flashed with a program you don't have.
If the reason you want it is because it is on a breakout board rather than having to dead bug, then you would be better served to buy the mod chip from someone else and put it on a breakout board. You don't even have to make your own. You can buy a breakout board for practically every chip package out there right off eBay for maybe a dollar or 2.
james_s:
I modded my Playstation about 20 years ago, the mod chip was a PIC12 microcontroller using firmware I found online. I'm pretty sure I no longer have that firmware but it should still be out there somewhere, maybe here. https://assemblergames.com/threads/tutorial-making-your-own-ps1-modchips.55904/
Katcher:
--- Quote from: james_s on November 04, 2018, 02:52:51 am ---I modded my Playstation about 20 years ago, the mod chip was a PIC12 microcontroller using firmware I found online. I'm pretty sure I no longer have that firmware but it should still be out there somewhere, maybe here. https://assemblergames.com/threads/tutorial-making-your-own-ps1-modchips.55904/
--- End quote ---
I've been looking at that tutorial. It doesn't provide the file I need though I did I look around for a PIC12F508 specifically after taking another look at that tutorial and found what I was looking for from Microchip as a SOIC package. If I get a bunch of those that just leaves me with with the question of what that second component in the image is and what it's purpose is. Does it need to be there? Would I risk damaging something if I forgo using it?
mikerj:
The second component looks like a MLCC capacitor, probably just 100nF for supply decoupling.
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