The Model PCIe-DIO-48S from ACCES I/O Products Inc., San Diego, CA, is a 48-channel PCI Express card that offers 48 or 24 high-current TTL digital I/O lines that are compatible with 8255 PPI (mode 0). Features include change of state detection and interrupt capabilities; buffered digital I/O with 32 mA source/64 mA sink current capabilities; 4- and 8-bit ports independently selectable for inputs or outputs; pull-ups on DIO lines; 5 V VCCIO on each I/O header; compatibility with industry standard I/O racks and two 50-pin male headers with 24 digital lines each. An x1 lane PCI Express connector can be used in any x1 or higher PCI Express slot.