To run games such as Frontier faster, you need a faster processor. Since you can't just replace the existing 68000 processor with a faster one, you need what is known as an accelerator board. These can either have a faster, original Motorola CPU (such as an 68020 or 68030), or more recently an FPGA.
FPGAs are modern, programmable chips that can be used to implement a super fast version of the original 68000, and this is what the Vampire does. Accelerator boards usually also have extra memory on them.
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