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Thread: Old PC Floppy images

  1. #11

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    As you are familiar with hex editors, you can use them to patch out the 160k image to "convert it" to a 360k or 720k image. At the end of each track in the image (after every 4096 bytes), add 512 bytes of padding if you want to make a 180k image, or rather 5120 bytes of padding if you want to make a 360k image. If you want to extend this to a 720k image just add another 360k of padding to the end of the 360k image.

    Note: This might enable you to write them to disk with Winimage, but the resulting disk will still act as a 160k disk when accessed in DOS. The actual physical type of disk doesn't matter as DD 3.5" media use the same bitrate as 5.25" media. Just make sure to use DD floppies without the "HD enable" hole in the corner.
    Last edited by per; October 30th, 2015 at 08:37 AM.
    Current systems owned by me:
    Vintage:IBM PC/XT submodel 087 ( 1983 ), [Kon]tiki-100 rev. C (1983), Compaq Portable I ( 1984 ), IBM PC/XT submodel 078 ( 1985 ), IBM PC/XT286 ( ~1986 ), 3x Nintendo Entertainement Systems ( 1987 ).
    Obsolete:Commodore A500 ( ~1990 ), IBM PS/2 model 70/386 type 8570-161 ( 1991 ), Atari Lynx II ( ~1992 ), Generic Intel 486SX PC ( ~1993 ), AT/T Globalyst Pentium w/FDIV bug MB ( 1994 ), Compaq 486DX4 laptop ( ~1995 ).

  2. #12
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    WRT microsoft flight simulator, most of the images I've seen (at least the ones in the total dos collection) are distributed as .td0 files. That's teledisk, which is a DOS disk image making/writing program which can handle the oddly formatted flight sim disks and write them back to an actual floppy disk. These images are not (AFAIK) able to be booted in emulators like dosbox.

    You might want to play with MS flight sim v2.1, also available in total dos collection, which was hacked apart by some dedicated nerd to be executed from DOS and not booted to as a disk image. You can simply unzip the game onto any media and play it.

  3. #13

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    Quote Originally Posted by Ozfer View Post
    Stone is Disk IMage Archiver the acronym for DIM? I tried the DIM program and it wouldn't work.
    Yes, it creates/restores .DIM images. It's by Ray Arachelian.

    Quote Originally Posted by Ozfer View Post
    If that program is different can it extract files or get it on a 720k?
    Yes, it can take a 160k, 180k or 360k image and restore it to a 720k disk.
    PM me if you're looking for 3" or 5" floppy disks. EMail For everything else, Take Another Step

  4. #14
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    Well, I get a lot old disk images, PC-DOS 1.0 included. Here's how I keep the customer happy with PC disks.

    I extract any files and archive them, I include an IMD image--and then a raw binary (sector by sector) file with a text description of the format. That seems to keep the archivists happy.

  5. #15
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    Quote Originally Posted by Ozfer View Post
    It would be great if someone could get a copy for us that is not in this IMG format I would love that.
    You can convert raw sector images to ImageDisk using the following commands:
    Code:
    160k raw to imd: (163,840 bytes)
    BIN2IMD <image.img> <image.imd> DM=5 N=40 SS=512 SM=1-8 /1
    
    180k raw to imd: (184,320 bytes)
    BIN2IMD <image.img> <image.imd> DM=5 N=40 SS=512 SM=1-9 /1
    
    320k raw to imd: (327,680 bytes)
    BIN2IMD <image.img> <image.imd> DM=5 N=40 SS=512 SM=1-8 /2
    
    360k raw to imd: (368,640 bytes)
    BIN2IMD <image.img> <image.imd> DM=5 N=40 SS=512 SM=1-9 /2
    
    1.2mb raw to imd: (1,228,800 bytes)
    BIN2IMD <image.img> <image.imd> DM=3 N=80 SS=512 SM=1-15 /2
    
    720k (3.5") raw to imd: (737,280 bytes)
    BIN2IMD <image.img> <image.imd> DM=5 N=80 SS=512 SM=1-9 /2
    
    1.44mb raw to imd: (1,474,560 bytes)
    BIN2IMD <image.img> <image.imd> DM=3 N=80 SS=512 SM=1-18 /2

  6. #16
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    My ancient utility, COPYQM had a CONVERT=<format> option also, but the target was always a physical disk. You had two types of conversion---"smart", where DOS layout was followed and "stupid" where a sector-by-sector copy was done without regard for the OS format.

    So, not new at all.

  7. #17

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    Kudos, Chuck, I used Copyqm for about ten years (1990s), mainly for multiple disk duplication. I always thought it was an excellent program -- and that was a long time before I knew you.
    PM me if you're looking for 3" or 5" floppy disks. EMail For everything else, Take Another Step

  8. #18
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    Yeah, it was pretty popular. Could only get a few interested in SyDupe, however--the "supercharged" version of CopyQM--it used up to 3 controllers to simultaneously format, write and verify 3 floppies at the same time. I've still got an old 486 tower here set up with 6 drives that I use to screen old floppies for reuse.

  9. #19
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    Quote Originally Posted by Ozfer View Post
    Also Flight simulator 1.05 only comes in the same format of IMG file and I cannot mount or burn it and most normal programs I use report it as corrupt. How in the world can I get the files out or just get them on a 720kb floppy in general?
    You can't, as Flight Simulator 1.05 doesn't use files or have a filesystem. It's a bootable program, and came that way originally.

    You can get it onto a 720K disk if you use a "raw" image writing utility; just specify single-sided and force it to write until it runs out of data. It will still work and boot, since 720K disks are just 360K disks with double the number of tracks.

    Quote Originally Posted by retrogear View Post
    There is no early dos image in the wild other than IMG ?
    "IMG" usually means "raw dump of a disk, side 0 first, then side 1, from track 0 to the last track". This is very common and most "raw" or "image" programs support it (rawwrite, winimage, etc.).

    "IMD" was the extension chosen by Dave Dunfield for IMageDisk. The file format is not raw as it contains much metadata about the disk's format and structure. ImageDisk can write such images back to floppy, and the file format is open and fully described so archivists will always be able to get at the contents. If an IMD image contains a regular floppy with nothing special or out of the ordinary, it can be converted to a raw image using a utility bundled with ImageDisk.

    Occasionally you will see "TD0" for Teledisk images, created by our own Chuck Guzis in the 1990s. These were used by early archivists before ImageDisk existed, as Teledisk images can properly preserve and reconstruct some protected disk images. I believe the PCem emulator, or PCE emulator (or both) can mount and read them. You can always write them back to a floppy disk once you transfer the software and images onto a vintage system.
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  10. #20
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    Also, ".DSK", often used with raw sector-by-sector dumps to be used with RAWREAD and RAWWRITE--and UNIX "dd". Those, and a text file describing the layout is probably the most transportable form. So, even if you can't run the utility that deals with them, you can write your own version.

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