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Thread: Got my Ohio Scientific Challenger C1P

  1. #1
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    Default Got my Ohio Scientific Challenger C1P

    Hey guys,

    Got my Challenger 1P today. Pretty nifty. I've made a video of it here: http://www.youtube.com/watch?v=FBshkT__5bA

    Mind my lousy commentary.. still getting used to the YouTube thing.

    interestingly, my Challenger doesn't do the screen garbage thing at startup. it comes instantly to the usual prompt.. and I mean instantly. There's no gradual fade in of the screen like my Commodores. I don't see any evidence there was ever a Challenger badge on it.. no glue residue, difference in paint. Wondering if it could be a 600 kit built up to Challenger specs?

  2. #2

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    Hello Falter,
    it looks good. The board seems to be original, without modifications.
    The board is the newer revision with the color option.
    Which type is the floppy drive? Do you get OS disks with it?
    Frank

  3. #3

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    Great!

    Yes, I would say that was from OS because the case is exactly the same colours as my 1P (which does have a badge). I think I have some of those mystery screws in mine too.

    Strange that you don't have to press break? I wonder if the later ones had a slightly different ROM where that action is not required.

    My 1P is just the single board and cassette based. Interesting to see the disk controller and extra memory board snuggled in there under the main one.

    I like these Challengers for the same reason you do...they represent that bare metal, hobbyist stage of computing before custom chips and attractive aesthetics.

    Tez
    ------------------------------------------------
    My vintage collection: https://classic-computers.org.nz/collection/
    My vintage activities blog: https://www.classic-computers.org.nz/blog/
    Twitter: @classiccomputNZ ; YouTube Videos: (click here)


  4. #4

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    Quote Originally Posted by tezza View Post
    Strange that you don't have to press break? I wonder if the later ones had a slightly different ROM where that action is not required.
    In Rev.C and Rev.D there is a complete new reset circuit, consists out of two OP-AMPs (LM393 (U80)).
    After powering on these newer versions C and D boards, this circuit resets the 6502.
    Frank

  5. #5

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    Quote Originally Posted by Frank S View Post
    In Rev.C and Rev.D there is a complete new reset circuit, consists out of two OP-AMPs (LM393 (U80)).
    After powering on these newer versions C and D boards, this circuit resets the 6502.
    Frank
    That explains it. Thanks Frank.

    Tez
    ------------------------------------------------
    My vintage collection: https://classic-computers.org.nz/collection/
    My vintage activities blog: https://www.classic-computers.org.nz/blog/
    Twitter: @classiccomputNZ ; YouTube Videos: (click here)


  6. #6
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    Quote Originally Posted by Frank S View Post
    Hello Falter,
    it looks good. The board seems to be original, without modifications.
    The board is the newer revision with the color option.
    Which type is the floppy drive? Do you get OS disks with it?
    Frank
    I pulled off the lid on the drive, there is a sticker:

    MPIO
    Micro Peripherals Inc.
    Model 51
    Mfg: 22 Sep 1982

    Didn't come with any disks, unfortunately.

  7. #7

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    Important is that the MPI-51 drive had the data separator modul.
    This little PCB is plugged in near the front of the drive.
    Do you get the flat cable with it?
    Frank

  8. #8
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    Quote Originally Posted by Frank S View Post
    Important is that the MPI-51 drive had the data separator modul.
    This little PCB is plugged in near the front of the drive.
    Do you get the flat cable with it?
    Frank
    Yes.. a long blue cable. I'm not sure though which way to connect it to the drive. The drive's connector has a little notch, but the cable doesn't. And pin 1 is not very clearly indicated, unless it is the last blue colored wire on the right if colored side up (back side of cable is all same color).

  9. #9

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    Please make some detailed pictures from the interface board, that is plugged on the 610 board.
    Frank

  10. #10
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    Quote Originally Posted by Frank S View Post
    Please make some detailed pictures from the interface board, that is plugged on the 610 board.
    Frank
    Here's some pics -- I discovered an arrow on the connector head that I assume is Pin 1. On the component side of the floppy board, there is a pin to the extreme left that appears to be marked 2. Thanks to the manual Tezza provided some time ago, I was able to determine that the odd sided pins are on the solder side, so I'm assuming 1 is directly underneath 2.

    I just wish I had a way to do some disk formatting and basic commands to see if it works.

    20140103_120131.jpg20140103_120222.jpg

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