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  • Dimension 68000 CP/M-86 diskdef

    From Steven Hirsch@21:1/5 to All on Fri Sep 2 09:33:10 2022
    In case anyone runs across one of these oddball machines:

    diskdef dim68k-cpm86
    seclen 512
    tracks 40
    sectrk 20
    blocksize 2048
    maxdir 64
    skew 1
    boottrk 1
    end

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Bill Shen@21:1/5 to All on Sat Sep 3 19:26:31 2022
    Should the topic title be:
    "Dimension 68000 CP/M-68K diskdef"?

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Steven Hirsch@21:1/5 to Bill Shen on Mon Sep 5 09:14:27 2022
    On 9/3/22 22:26, Bill Shen wrote:
    Should the topic title be:
    "Dimension 68000 CP/M-68K diskdef"?

    They use the same diskette layout for generic (non-Kaypro) CP/M-80, CP/M-86
    and CP/M-68k. But, yes, it might have flowed better that way :-).

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Martin@21:1/5 to Steven Hirsch on Mon Sep 5 17:48:47 2022
    Am 09/02/2022 03:33 PM, Steven Hirsch schrieb:
    In case anyone runs across one of these oddball machines:

    diskdef dim68k-cpm86
    seclen 512
    tracks 40
    sectrk 20
    blocksize 2048
    maxdir 64
    skew 1
    boottrk 1
    end


    I also analysed the format, while repairing
    the corrupted trisoft archive.

    I used the diskdefs to extract the FORTRAN files
    from the imaged in Dunfield's collection "dimen68k.zip".

    They were RELOCated binaries, I used them to verify
    the correctness of my work.


    But beware, depending on the CP/M Version,
    they used two different formats!

    Basically your diskdef is equivalent to the
    Version 1.2 definition.



    ########################################
    # Microcraft Dimension 68000
    # Version 1.0x: dim68-10
    # Version 1.2x: dim68-12

    diskdef dim68-10
    seclen 512
    tracks 80
    sectrk 10
    blocksize 2048
    maxdir 64
    skew 0
    boottrk 2
    # this format wastes half of the directory entry
    logicalextents 1
    os 2.2
    end

    diskdef dim68-12
    seclen 512
    tracks 80
    sectrk 10
    blocksize 2048
    maxdir 64
    skew 0
    boottrk 2
    os 2.2
    end

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Steven Hirsch@21:1/5 to Martin on Tue Sep 6 09:37:50 2022
    On 9/5/22 11:48, Martin wrote:


    I also analysed the format, while repairing
    the corrupted trisoft archive.

    I used the diskdefs to extract the FORTRAN files
    from the imaged in Dunfield's collection "dimen68k.zip".

    They were RELOCated binaries, I used them to verify
    the correctness of my work.


    But beware, depending on the CP/M Version,
    they used two different formats!

    Basically your diskdef is equivalent to the
    Version 1.2 definition.


    Thanks, Martin. The version 1.0x definition is essentially the same as Kaypro 10 is it not? That would make sense since Kaypro is one of their standard emulations for the Z80 board.



    ########################################
    # Microcraft Dimension 68000
    # Version 1.0x: dim68-10
    # Version 1.2x: dim68-12

    diskdef dim68-10
      seclen 512
      tracks 80
      sectrk 10
      blocksize 2048
      maxdir 64
      skew 0
      boottrk 2
      # this format wastes half of the directory entry
      logicalextents 1
      os 2.2
    end

    diskdef dim68-12
      seclen 512
      tracks 80
      sectrk 10
      blocksize 2048
      maxdir 64
      skew 0
      boottrk 2
      os 2.2
    end



    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Martin@21:1/5 to Steven Hirsch on Tue Sep 6 19:04:53 2022
    Am 09/06/2022 03:37 PM, Steven Hirsch schrieb:
    On 9/5/22 11:48, Martin wrote:


    I also analysed the format, while repairing
    the corrupted trisoft archive.

    I used the diskdefs to extract the FORTRAN files
    from the imaged in Dunfield's collection "dimen68k.zip".

    They were RELOCated binaries, I used them to verify
    the correctness of my work.


    But beware, depending on the CP/M Version,
    they used two different formats!

    Basically your diskdef is equivalent to the
    Version 1.2 definition.


    Thanks, Martin. The version 1.0x definition is essentially the same as Kaypro 10 is it not? That would make sense since Kaypro is one of their standard emulations for the Z80 board.


    Did not notice this coincidence, good to know.

    I just couldn't read some of the images from bitsavers,
    "EMUL_1.04.IMD" is an example.

    Every file with more than one extent had only zeroes in it beginning
    with offset 4000h, then continues at offset 8000h, and so on.


    Have fun!
    Martin

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    * Origin: fsxNet Usenet Gateway (21:1/5)