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Hello everyone, today we are going to learn about BIOS chips

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There are three main aspects of the content

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The first is a common BIOS chip manufacturers

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The second is the common BIOS chip packaging

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The third is the capacity identification of BIOS

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First, let's take a look at the BIOS chip manufacturers

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Common BIOS chip manufacturers include SST, MACRONIX,

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WINBOND, cFeon, Microchip, and Micron

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These are some common BIOS chip brands

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There are usually three types of BIOS chip packaging

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The first is the SOP 8 pins package

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The second is the QFN package,

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which is very common in Apple's machines

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The third is a BGA packaged glass chip,

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which has this crystal shell and pads on the bottom

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Ok, let's look at the BIOS chip capacity identification,

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we usually identify its capacity according to its model

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First of all, let's take a look at this chip

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Its LOGO is MXIC, which is owned by MACRONIX

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So this is the manufacturer of the chip

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The second row is 25L128,

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this is the chip model,

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25 refers to 25 series,

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128 refers to its capacity

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BIOS files are stored in bytes,

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128 means 128 megabits

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If we look at the suffix, 128 means 128 megabits wide

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128 megabits wide, actually can store 16 megabytes, because a byte requires 8 bits

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So 16 megabytes is 128 megabits wide

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So when we identify the capacity, we divide its mantissa by 8

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Divide the suffix of the chip model by 8 to get the actual capacity

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For example, if the model is 25L128, divide 128 by 8 to get 16, which indicates 16 megabytes of capacity

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For example, this chip 25L4005, 400 divided by 8 is its actual capacity, which is 512 kilobytes

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The mantissa is 004/040/400, which means 4 megabits

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Like this 25Q64, Q64FV

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64 means 64 megabits, so the actual capacity is 8 megabytes

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So when we identify the BIOS chip capacity,

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we use the chip model suffix divided by 8, is the actual capacity

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Ok, this is the identification of the BIOS chip capacity