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Mystery S-100 FDC, VISTA, SOL

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    #16
    It was interesting to have a look at the V*.RAW Image. I think I know what is going on with that image.
    Your Directory is located at 0x2000 = 8192 Decimal. And the first track is 128 Bytes x 24 sectors long
    making it the boot track (track 0). The remainder of the floppy is 512 x 10 sectors.

    What I did was to move the beginning of track 1 to 5120 (512 x 10). I used dd in Linux to do that.
    dd is also known as DATA DESTROYER.
    $dd if=vistaorig.raw skip=3072 bs=1 of=vtest.raw conv=notrunc;sync

    (I renamed your original file just to make it easier to type.)

    This chopped off the first track (track 0 = boot track) and has the Directory located where cpmtools
    would typically look. (I've had trouble with cpmtools trying to access other images with an odd
    ball Boot track that was Single Density.)

    Then, it was just a matter of getting the Definition correct enough to extract the files so the ASCII
    or TEXT files were SANE. That did take a bit of work, but it finally worked.

    The three linux commands I used were:

    build the new code
    $gcc -o mmcpm3U1 mmcpm3U1.c
    See if it gives a proper directory
    $./mmcpm3U1 vistaorig.raw
    extract the files
    $./mmcpm3U1 copy vistaorig.raw

    If the data had been inverted I could have used
    $gcc -o mmcpm3U1 mmcpm3U1.c
    $./mmcpm3U1 examine vistaorig.raw
    $./mmcpm3U1 copy vista.img

    I wasn't able to use cpmtools ver 2.21 because it barfs when trying to access the HEX bytes of your file.
    And the OFS xxxx (with BOOTTRK 0) doesn't seem to want to work on your original file. So, I located the
    DIRECTORY and just chopped xxxx bytes to make the Directory start at 5120 (Decimal) and then I can
    access it properly with mmcpm (a modified mmcpm.c)

    The attached text file will give you the information you are wanting. I think the files are good since the DOC and
    .ASM files appear to be SANE. But, the ONLY way to know for sure is a BINARY COMPARE or just try
    them in CP/M (if you dare).

    Maybe your cpmtools version will work with this definition:# Sorcerer Vista 5.25" SS 40T (40T 10x512 s/t)
    diskdef vista
    seclen 512
    tracks 40
    sectrk 10
    heads 1
    blocksize 1024
    #maxdir 128
    maxdir 64
    skew 0
    # skewstart 1
    # datasect 1
    # boottrk 1
    #0x2000 = 8192 was original DIR location
    # offset 5120
    offset 8192
    boottrk 0
    os 2.2
    end

    If not, you can always chop off the first 3072 bytes and use the offset of 5120.


    # vista - Sorcerer Vista - SSDD 48 tpi 5.25" - 512 x 10
    diskdef vista
    seclen 512
    tracks 40
    sectrk 10
    secbase 0
    blocksize 1024
    maxdir 64
    skew 0
    offset 8192
    boottrk 0
    os 2.2
    end

    # libdsk data below
    [vista]
    description = Sorcerer Vista - SSDD 48 tpi 5.25" - 512 x 10
    cylinders = 40
    heads = 1
    secsize = 512
    sectors = 10
    secbase = 0
    datarate = DD



    Larry


    vtest_info.txt
    Last edited by ldkraemer; August 9, 2019, 11:09 AM. Reason: added cpmtools & libdsk definitions

    Comment


      #17
      DECOD2.COM & ENCOD2.COM both appear to start execution properly, and just need the password:
      Code:
      A2>DECOD2
      
      Decode II  v1.0
      
      Copyright (c) 1980 - SuperSoft & Herbert Schildt
      
      Enter password: 53421
      XXXXX
      Invalid
      Program terminated...returning to operating system

      Larry

      Comment


        #18
        If you run PASS2 on the disk, you can change the password to what ever you like

        I simply chopped off 3072 bytes from the start and used below to extract all files perfectly using CMPToolsGUI

        diskdef vista
        seclen 512
        tracks 40
        sectrk 10
        secbase 0
        blocksize 1024
        maxdir 64
        skew 1
        boottrk 1
        os 2.2
        end

        Comment


          #19
          Originally posted by Hugo Holden View Post
          That disc controller to me looks very similar to a Northstar MDS-AD3, with roughly about the same number of IC's, from what has been said it may be a fairly close knock off, it would be interesting to compare the schematics if you can find the Vista one.
          The OP is long gone but the quest to document micro-computing history continues.

          An inch and a half thick documentation folder for the Vista floppy disk system has been located in Canada. I am confident of finding a way to eventually get it scanned at archival quality.

          vista_binder_vcfed.jpg vista_tabs_vcfed.jpg

          Comment

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