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Yes, there were other co-processors for the IBM PC computer other then Intel 8087 NPU/FPU Units. Many of them had additional circuity with some RAM and a ROM chips. The ROM chips on some of them contained an FPU emulation program if it was using a standard microprocessor other than a Intel model. Others had a BIOS extension for the system. Some older issues ...


Yes it is possible to have an IDE controller on a 8087 NPU (FPU) coprocessor socket. Most of these adapters had a circuit to switch in a BIOS and RAM cache Overlay when the IDE controller logic required it. .. Another example of this would be any expansion card that used the Dec. Rainbow 100 computers memory expansion card slot for peripherals. The card ...

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