Mm3 modchip scph 5501 diagram install#
The only system that you definitely shouldn't install an MM3 in is the SCPH-102 (install a ONEchip instead). Because of this you're more likely to find people who can help you if you are having problems installing your chip.Īdditionally the MM3 is compatible with most PS1 consoles and can play anti modchip games if you install all seven wires. From my experience it is the single most popular PS1 modchip being used today. The MM3's greatest strength is its compatibility and popularity. Additionally it has been reported that certain batches of PIC chips have had problems with the oscillator value in the past. Using the internal oscillator can sometimes cause the chip to become out of sync with the console when booting, meaning you'll have to restart the console to boot.Ĭertain PIC programmers can also mess up the internal oscillator value when programming, which could be a problem if you are programming your own chips. The biggest problem with MM3 chips is how they base their timing on the internal oscillator within the PIC chips. Once you know what board you have you can click on the board model and you'll be sent to a page with the installation diagram. To actually know what board you have you'll most likely have to open up your console and look for the board version printed somewhere on the board (something like PU-22 or PM-41). You can get a good idea of what board you have by looking at the model number underneath your system (something like SCPH-7501). MM3 modchip installation diagramsīelow is a list of all PlayStation 1 motherboard versions, along with the console model numbers associated with them. If you want more information about PlayStation 1 modchips in general check out this guide. It includes general information about the chip, and then links off to installation guides for each console model. It's organized like this primarily so that comments can be more organized and useful for readers. This guide is structured into several pages. If you are looking to purchase an MM3 modchip they are for sale in my store. This guide covers everything you need to know about choosing, programming, and installing an MM3 modchip into your PlayStation. They can be made using PIC12C508A, PIC12F629, and other PIC chips. Just some ideas.MultiMode 3, or MM3 modchips are very popular, and should work with every version of the PlayStation 1. in case that the GPU should output an amplified constant 53MHz test signal somewhere, then one could divide that by 12). Later consoles (PSones at least), are using an external clock divider, which does always output a constant color clock, regardless of whether the GPU is in 50Hz mode or 60Hz mode.įor modding the older PSX boards, one could use the 4pin crystal (as shown the jpg above), or one could use a 2pin crystal (which may be easier to get, but which might require some additional amplifier, the CXA-1645 datasheet may contain more info on that), or one could probably use some clock divider instead of a crystal (eg. The problem is GPU.Pin153 which seems to output 53MHz/12 in 50Hz mode (PAL color clock), and 53MHz/15 in 60Hz mode (NTSC color clock). the part about GPU.Pin157 is just same as on later PSX models. Pin6 is SCIN color clock (normally goes to GPU.Pin153) (must be 4.43361875MHz to get intact PAL colors at both 50Hz+60Hz) Pin7 is NTSC/PAL select (normally goes to GPU.Pin157) (must be GNDed to force PAL mode at both 50Hz+60Hz)
Pin1 is GND (how stupid is that? Can't they say GND instead of Pin1? grmph) After some reverse engineering, I found out that the four CXA-1645 pins are: Instead of signal names, they are just talking about "connect the green wire" and the "to solder pad shown on the photo".
Mm3 modchip scph 5501 diagram mods#
The ugly thing about mods is that they are usually not telling what they are doing, and why they are doing it.
The forum where I found the above jpg stated that the QXO-1100 should be 5V, 4.433MHz (which looks quite right for a PAL mod). The missing info in the jpg is: what-the-fuck is a QXO-1100? As far as I understand, QXO-1100 is some product line that can have different frequencies and maybe also different voltages. I came across that same jpg yesterday, too.