Extracting CDOS and CP/M) files - Progress

Ok - this morning I got a program working which can extract the CDOS files directly from my ImageDisk images - The extracted files exactly match two other sets extracted independantly for me by Mike S. and Chuck G. (THANKS guys!) - so it looks like I have it working correctly - this makes things much easier, since IMD is able to read the disks with no problems - since I'm planning to provide both IMD backup images of the disks, and ZIP files containing the content files, this will save me a step as well. When I have time, I will look into enhancing the utility into a general purpose tool for reading and writing files to CP/M images. You will need to provide some additional information so that it can know how to access the particular image. So far I have needed: - Cylinder/Head mapping and interleave required to access CP/M logical sectors. - Actual size of a physical sector (I can get this from the .IMD) - Number of 128 byte records in a cluster (Yeah, I know you guys call them blocks, however CDOS refers to them as clusters). - Number of directory entries. - Offset to user area (size of system area). - I'll need to add something to handle 16-bit allocation entries etc. when I move on to "large" disks. Not all of this information can be gleaned from the disk, so a general tool will need some sort of configuration file similar to what Chuck does with 22disk. Will let you know if/when I get "a round tuit" - at least now I am able to extract the files from the diskettes with relative ease. Dave -- dave06a (at) Dave Dunfield dunfield (dot) Firmware development services & tools: www.dunfield.com com Collector of vintage computing equipment: http://www.classiccmp.org/dunfield/index.html