Most MoBo's still have a serial port (or maybe two?) even though it's probably not on the back side. It's often just a 0.1" header tugged away in some corner, and maybe the signals are only TTL without line drivers. But it's not a selling point for a long time so shops don't advertise it. You have to check the booklet of the MoBo you're interested in for this.
The problem with mine was that the serial port UART was built into the chipset, and the board was laid out with the header for RS-232, but the external level translator and header were left out despite the specifications and documentation indicating a serial port. So I installed a PCI serial/parallel board and all was well.
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