Abstract: An inertial Navigation System (INS) data interface box allows the transfer of INS data to standard commercial computer (i.e. Personal Computer or PCs) for flexible in-flight use of data received from the INS. The data box includes a means connected to the data bus for changing the INS output from 12 to 5 volts. The data of interest is then applied to a Label/Decode circuit which in turn directs the data to a Write Address Generator circuit which then applies the data to a Page One Memory Buffer circuit. After the data is filed in the Page One Memory Buffer, the Write Address Generator directs a Page Control circuit to turn to a Page Two Memory Buffer to accept the next cycle of data. During the interim data can be read out of the Page One buffer and converted to 8 bit words for applications to the PC. Should the 8 Bits Converter be processing data, "page flips" is inhibited to prevent readout from the Page Two Buffer from mutilating Page One Buffer data as it is being read out.