if it's serial flash chip, you'll need simple serial programmer (SPI programmer), or built one. it's simple, you'll need some discrete passive elements, like resistors and couple of diodes, and also a serial/ parallel port, or USB-to-Serial adaptor, just check your search engine for details. But if your BIOS chip is parallel programmed, then you'll need more sophisticated microcontroller based programmer and special socket (usually PLCC32) to put flash chip in it. You can distinguish flash type by leg count. If it has 8 legs (DIP-8 package), its serial, if more (like 32 in PLCC32 package), then it's parallel.
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