Recent content by WydD

The schematics have been fixed. The comment and binary pattern was right, I have no idea how I made that mistake, that's weird. I took the opportunity to finally fix the CI pipeline so now it's will immediately publish new svg/pdfs whenever I need to change something. @MickyMac It's not that...

Looking at the die it seems that the schematics are wrong https://petitl.fr/cps2/DL-0311/die/#x=16005&y=8351&z=7 (click on the red dots in the cell to display the line and the label). Afaics ~LINE4 needs to be replaced by ~LINE3 ~LINE5 needs to be replaced by ~LINE4 I'll double check and fix...

You didnt think it would be easy, did you? :D The B-21 was 69 pages. This one a tad bigger but I wouldnt say I made it artificially bigger, the chip is just more complex. That's why I strongly encourage people to use the online explorer I've made https://petitl.fr/cps2/DL-0311/ it is WAY...

Heyo! I'm very pleased to share to the community my complete reverse-engineering of the CPS-A-01. I have worked over 8+ months on the die shot of this chip and I've produced the full schematics with a bunch of documentation pages. Here's the overview image of the schematics You can access...

A-01 analysis is in progress. But it will take months like the B-21.

If you have nothing on the code rom it maybe means that nothing is transmitted through the DL-1727 (MIF) which is main purpose is to manage the main bus. And because sound is derived from the main bus, it's kinda the same thing. So I would check: - All the main enable lines: ~RESETI (HIGH)...

Glad my work for the reverse was useful! You've done an amazing job! The ~REFRESH signal is transmitted to the main work+video DRAM to perform its refresh cycle. So, nothing really concerning video display at first glance. However, there is one synchronisation point inside the DL-1827 which...

Heyo all, I just published all the files of this project. They are publically available in this repository https://gitlab.com/loic.petit/cat702 You will find: FPGA source PCB design and schematics Software experiments and test checks Enjoy.

Ermm nope, I never touched a hard disk controller, why do you ask :D

I was just doing research on my own like I usually do, and took the opportunity for me to learn more about this system and FPGAs, that's all.

@Hammy yep I know, it's really impressive btw :) I just thought it would be a nice project to try this way and provide an alternative way to enable other multi designs. ^^

Hey everyone, Lately I've worked on the CAT702 security chip on ZN systems in order to perform a ZN2 conversion (EX2 -> Tetris TGM). And today I've managed to succeed. This is a picture of my current ultra-janky-af-breadboard implementation and a proof that the game is actually running in the...

Agreed, the only one weird thing that I don't understand: there is a feedback loop using the 0.1 ohm resistor. I'm not sure how it impacts the rest.

Yes I saw those. At first I wondered if it was an official alteration or just a mod done :P I'll add a note to the schematics.

FYI I created a dedicated thread on the topic: CPS QSound Amp Reverse Engineering The values have been filled now :)