FInally I could extract the information of the Altos 586 disks which I mention some weeks ago. The fact was to convert the IMD files in BINARY images. Then you can access them with the 'tar' command. It works, but... the cobol set which was what I was searching comes only with one disk, but they are TWO. You can note it when decompress the existent disk with 'tar' in the Altos System in raw and noraw mode, and it tell you: "please, insert tape/disk number 2; then type 'y <return>' " If you 'untar' the tar files in one pc and review the readme files you can see too the fault of some important files as the COBOL compiler itself. The question is: Some opportunity to obtain the lost second COBOL disk ? Thanks Regards Sergio