How about a SCSI device instead. Most UNIX boxes and Macs nowadays have a few unused SCSI IDs. The great majority of DOS machines with SCSI (all those new ones with CD-ROMs, etc.) have unused SCSI IDs. SCSI has the advantage of being rather fast, and is a cross-platform solution. ``Cross-platform'' is great, but ``fast'' is probably a bad idea. Few random number generators are particularly fast, and if you sample the input too rapidly, you're likely to get too high a correlation between successive bits.