![]() Many bugs and enhancements have been fix and changed. The other tracks are formatted as 256bit/sector with MFM and can be treated by PC drives. This is a format which can not be used by standard controllers present in IBM compatibles. 640kB disks cannot be copied with this program.The main problem is that the PCOS formats the track 0 as 128bit/sector using MF. They are able to read and write a disk image of a 320kB PCOS disk and to format a M20 disk on a MS-DOS based computer. This first solution available is based on three programs contained in this packet. We will describe all of those strategies. Using PCOSFILE.BAS and FILE-DOS.BAS under GW-BASIC and a PC.For technical reasons, 1.2MB drives do not work. The differences between the PCOS format and the MS-DOS one makes rather cumbersome to share file and data between the two systems.Anyway, in the mid-80 and more recently, several authors have written software able to read and write PCOS disks from a MS-DOS machine with a 360kB drive. The disc format used by the Olivetti M20 is rather peculiar. How to read and write disk images for the M20 system
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