Frank there is no “device driver” written that I am aware of yet for the Dual IDE board. At least in the traditional sense of the word for a device driver. The approach instead was to incorporate the interface code in the 8086 ROM BIOS using the standard MSDOS/PC disk interrupt calls (floppy and hard disks). This way a “standard” Microsoft MSDOS disk can run unaltered on the system – at least up to MS-DOS V4.01. Later versions will need more work! The 8086 (and 80386) monitors are by now fairly elaborate – still evolving but can be seen here:- http://s100computers.com/Software%20Folder/8086%20Monitor/8086%20Monitor.htm http://s100computers.com/Software%20Folder/80386%20Monitor/80386%20Monitor.htm Note, as things currently stand you would also need to have the MSDOS Support board, S100 board (or its chips equivalent) as well. Hope this helps John From: n8vem...@googlegroups.com [mailto:n8vem...@googlegroups.com] On Behalf Of Frank Schieschke Hello, -- |