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Thread: Wanted: Exidy Sorcerer CP/M

  1. #81
    Join Date
    May 2018
    Location
    Melbourne, Australia
    Posts
    199

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    Just popping this photo in for future reference of the serial number label nameplate sticker on a 77 track Floppy Disk Subsystem FDS drive.
    Of the two 77 track drives I have seen in Australia both are labelled DP6400-2 rather DP6402
    Not sure we ever got a 40 track version of the FDS like yours.
    20191001_183720.jpg
    Presumably you could also read your 40 track floppy in a conventional imaging setup since it has the standard 48TPI track pitch?

  2. #82

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    Here's a few pictures of the DP6400/DP6401 combo and the serial numbers.


    IMG_0159.jpgIMG_0160.jpgIMG_0161.jpgIMG_0162.jpgIMG_0163.jpgIMG_0164.jpg

  3. #83
    Join Date
    May 2018
    Location
    Melbourne, Australia
    Posts
    199

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    Quote Originally Posted by exidyboy
    I may be able to negotiate access to disks containing CP/M 2.2 for the Exidy FDS - an exciting find. Al do you already have CP/M 2.2 disks
    So I did actually get this drive. The bezel got damaged in transit (both right angle mounting tabs broke off - and one side shattered into two pieces) and the lead screw popped out of the bearing.

    I had the bezel plastic tested on an FTIR spectrometer and as it was polycarbonate I followed Chuck's advice and repaired it with a dichloromethane based solvent cement which is tricky to work with as it is water thin but the repair seems solid.

    I also needed to replace the shattered Southcorp sheet-edge inserts - Southcorp were very helpful and helped me to find the model number of this obsolete non-stocked part so I now have 99 left over from the bag purchased on ebay - probably a large proportional of the world's remaining supply - let me know if you need any.

    I put the who drive back together today and when connected it was holding the Sorcerer down. After some head scratching I discovered that Exidy had fitted the floppy disk controller PCB with a 6 way header that sends rectified DC power out to the voltage regulators mounted on the heatsink at the rear of the case and returns the regulated 12VDC and 5VDC to the FDC mounted in the bottom of the case under the drive.

    However for some reason they used a 5 way receptacle to connect to the regulators meaning there are two positions in which this female receptacle will connect mechanically with the 6 way male header. Unfortunately I connected it the wrong way so I may now have fried the controller board and the Micropolis 1015 100TPI drive - this is disappointing as the whole shebang has been loaned to me so CP/M 2.2 for the 77 track Exidy FDS setup can be imaged for the first time.

    When I design things I take pains to make sure that each connector is unique in the number of ways, that they are polarised and that off course the number of ways match. I would never use a 5 way receptacle on a 6 way header - precisely because it is ambiguous.

    There seems to be no service manual for the DP6400 so I have some debugging ahead of me to work and which components have been damaged.
    At the moment the onboard PROM is certainly not appearing at BF00 in the Sorcerer's address space.
    Fortunately the Sorcerer seems OK as all the I/O is buffered (and latched) unlike some later cost-reduced microcomputers with similar architectures.
    Last edited by exidyboy; January 1st, 2020 at 06:37 AM.

  4. #84
    Join Date
    Apr 2011
    Location
    Victoria, Australia
    Posts
    28

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    Sorry to hear of the problems, but be positive, you now have an extended 2020 project

  5. #85
    Join Date
    Sep 2006
    Location
    Silicon Valley
    Posts
    2,151

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    A binder showed up on eBay for the combo monitor/floppy system
    https://www.ebay.com/itm/133331220613
    It had a copy of CP/M 1.42 with basic
    Single sided, soft sectored 16, 256 byte sectors
    .imd up now at http://bitsavers.org/bits/Exidy

    I should have the manuals scanned an on bitsavers in a day or two

  6. #86
    Join Date
    May 2018
    Location
    Melbourne, Australia
    Posts
    199

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    Quote Originally Posted by Al Kossow View Post
    A binder showed up on eBay for the combo monitor/floppy system
    https://www.ebay.com/itm/133331220613
    It had a copy of CP/M 1.42 with basic
    Single sided, soft sectored 16, 256 byte sectors
    .imd up now at http://bitsavers.org/bits/Exidy

    I should have the manuals scanned an on bitsavers in a day or two
    Nice one Al - great to see how Exidy originally presented that product.
    Is it a 100TPI disk?
    I imaged CP/M 2.2 the other day to CPC-EMU .dsk format if you want to add that as well.
    http://www.michaelborthwick.com.au/t...even10.dsk.zip

  7. #87
    Join Date
    Sep 2006
    Location
    Silicon Valley
    Posts
    2,151

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    I read it at 48tpi since that was what the drives in the combo are. LMK if I got it wrong
    http://www.michaelborthwick.com.au/t...even10.dsk.zip isn't a valid url

  8. #88
    Join Date
    May 2018
    Location
    Melbourne, Australia
    Posts
    199

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    Quote Originally Posted by Al Kossow View Post
    The forum s/w seems to munge the link. Try clicking on the link at the top of the original thread.
    http://www.vcfed.org/forum/showthrea...536#post602536

  9. #89
    Join Date
    May 2018
    Location
    Melbourne, Australia
    Posts
    199

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    Quote Originally Posted by Al Kossow View Post
    A binder showed up on eBay for the combo monitor/floppy system
    https://www.ebay.com/itm/133331220613
    It had a copy of CP/M 1.42 with basic
    Single sided, soft sectored 16, 256 byte sectors
    .imd up now at http://bitsavers.org/bits/Exidy

    I converted the .IMD to CPC-EMU .DSK format using ubeedisk and was able to read the image in MAME on a virtual Sorcerer running a DreamDisk FDC once I told the I had a 40T Exidy soft-sector disk in the B: drive.

    So looking like a good read Al

    al.png

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