With 128-byte FIFOs, a two-port PCI Express serial interface adapter (the COMM+2.PCIe) from Sealevel Systems supports 9-bit framing and is software compatible with legacy 16550 UART applications. The serial ports on the COMM+2.PCIe are individually configurable for RS-232, RS-422, or RS-485. The 14.7456 MHz oscillator and the UART’s flexible clock prescaler support standard and non-standard baud rates. Each serial port is capable of data rates to 921.6 Kbps. In RS-485 mode, the transmitter is automatically enabled in hardware. The adapter is priced at $289 for low profile (Item# 7205e) and standard size (Item# 7205eS) PCI Express slots.