Maybe because ISA is very simple to implement?
You can support a subset of PCI with a fairly simple fpga implementation, but even the antique pci with its 33/66Mhz bus can be tricky to design with correct signal integrity.
You can support a subset of PCI with a fairly simple fpga implementation, but even the antique pci with its 33/66Mhz bus can be tricky to design with correct signal integrity.
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