So Frank if I understand you correctly, you can read/write sectors to your 3.5” floppy using the ZFDCDIAG (z80) program but you cannot do so from the 8086 monitor program using the “X” menu. Before I look into it is this correct. What disk format are you using for the floppy. How was it formatted. Have you tried formatting a disk on a PC and using that one. If you write a few text files on a clean disk with your PC can you read them correctly with ZFDCDIAG. John From: n8vem...@googlegroups.com [mailto:n8vem...@googlegroups.com] On Behalf Of Frank Schieschke Really no one has a hint for resolving my problem? -- |