quartet serial PCI+dos, 4-port serial (16550), universal PCI card design with built-in 32 byte fifo buffers to work in 32/64 bit, 3.3v/5v PCI and PCI-x slots
dual profile PCI-1s, single serial (16550) port, universal PCI card design with built-in 32-byte fifo buffers to work in 32/64-bit, 3.3v/5v PCI and PCI-x slots