![]() However, it need not do absolutely everything every time it is turned on. On the topic of reconfiguring everything, the system firmware does a lot of work to setup the PS4 into a state in which it can load an operating system. It’s also what prevents you from having to reconfigure everything when your PS4 is turned back on. This is what allows your PS4 to maintain accurate time down to the second even when it’s turned off. However, power to the system’s real time clock and that small SRAM chip is maintained through a small battery located on the motherboard. When your PS4 is powered off, power to the CPU, hard disk, DRAM, GPU, etc… is cut. When it loses power, the information stored in it is lost. ![]() As you will see below, it will also provide a convenient method of disaster recovery. The reason for storing these settings in an SRAM chip rather than alongside the firmware itself on an EEPROM is historical, EEPROMs can only be overwritten so many times before they become unreliable. All of the configuration information such as boot priority, CPU settings, fan speeds, and the storage controller mode of operation are stored on this chip. This SRAM chip is used to hold firmware settings. What people refer to as CMOS is actually a small SRAM chip on the PS4 motherboard which traditionally was constructed using CMOS logic. It allows you to shut your PS4 down for an extended period of time and still have the correct time and date in place when you use your PS4 again. The CMOS battery in PS4 consoles is a small, round battery that helps you store the day, time, and month on your PS4. ![]() The word CMOS is an acronym for “ complementary metal oxide semiconductor”.
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