At 20:54 25/02/99 -0800, Don Maslin wrote: The problem with the APC III was that NEC decided that it wanted nothing to do with IBM compatability. Therefore the BIOS was completely non standard. For instance (say he typing with cobwebs on his hands after getting down the APC III Programmers reference manual) Keyboard is 18H Video is 19H COM1 is 1AH Printer is 1BH Timer is 1CH Disk IO is 1DH COM2 is 1EH Consequently, any DOS that assumes IBM BIOS compatability won't work The last version for the APC III was 2.11 NEC saw the error of their ways late in the life of the APC III and released a board (the SLE board *) that made the machine (almost) IBM compatible. If you have one of these fitted, later versions of DOS should (may?) work. Also note that to ensure incompatability, the disk drives are 80 track, not the standard 5" 40 track. This means that the capacity is 720K I might have (somewhere) the APC III DOS disk. Note, even without the SLE board these were a great machine. They used an 8086, not an 8088 and were quite fast for their day. Dean * short for Standard Library Extension (they really couldn't bring themselves to use that word ... IBM)