CF reader on GD-ROM board

Discussion in 'Sega Dreamcast Development and Research' started by MastaG, Jul 3, 2019.

  1. MastaG

    MastaG Rapidly Rising Member

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    Hi there,

    Since we're still here.. I've got a question.
    I wanted to mod my other Dreamcast with a 44-pin IDE CF reader on the side (on top of the modem).
    So I bought a dremel tool and carved out a nice slot.

    However IDE uses so many wires it makes it hard to route them all to the test-points on the bottom of the mainboard.

    But I found this (attached) picture on this website: https://fnhack.wordpress.com/2014/10/13/nice-g1-ata-hdd-hack-from-aldair/gd-rom-hdd-mod/
    [​IMG]
    So I first cut a bit of the side of the bottom plate of my GD-ROM housing.
    Then wired up my CF card reader using kynar wires to the points on the GD-ROM board instead.

    Now according to the information on this page: https://fnhack.wordpress.com/2015/05/21/new-pinout/
    The following pins on the CF reader should be grounded: 2, 19, ,22, 24, 26, 30 and 40.


    Now according to the 44-pin (PATA) IDE spec, pin 43 should be grounded as well.
    See: [​IMG]


    But on the CF-reader I found out that pin 2, 19, 22, 24, 26 and 30 are actually connected internally.
    So I only connected pin 22, 40 and 43 to the ground point of the GD-ROM board.
    Furthermore I've connected 5v to both pin 41 (logic) and 42 (motor).
    All other pins have been connected as well using just kynar wire (no resistors or anything).

    The CF reader has been set to slave mode (no jumper).
    But it doesn't seem to light up.
    Tried different CF cards and confirmed it's getting 5v on pin 41 and 42.

    When I load DreamShell from CD-R it seems to hang forever when a CF card is inserted.
    Without a CF card it boots fine so the GD-ROM drive is OK.

    Any ideas?
    Is the pin-out on the GD-ROM board correct and suitable for a IDE Cf-reader?
     

    Attached Files:

  2. fafadou

    fafadou Enthusiastic Member

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    I advise you to connect in the gdrom rom board right.

    You don't need to weld all pins. But I don't refind the picture...
     
  3. MastaG

    MastaG Rapidly Rising Member

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    Well I still need to make a photo of it... but you're advice is that the points on the gdrom pcb are suitable for the IDE CF reader?
     
  4. thedoctor45x

    thedoctor45x Member

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    it's sufficient to only ground pin 2 the other grounding cables can be removed entirely - also make sure the ground wire is not longer than 8cm.
     
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  5. MastaG

    MastaG Rapidly Rising Member

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    Ouch... my 3 ground wires (pin 2, 40 and 43) are 15cm each.. but I'm using thick stranded wires for them (taken from an old computer-fan).
    The other wires are shorter (10cm) but kynar.

    Will post pics soon.
    Thanks
     
  6. psobb2009

    psobb2009 Rising Member

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    Any ideas?
    Is the pin-out on the GD-ROM board correct and suitable for a IDE Cf-reader?[/QUOTE]
    [​IMG]
     
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  7. psobb2009

    psobb2009 Rising Member

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    MastaG likes this.
  8. MastaG

    MastaG Rapidly Rising Member

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    Yes, I know there's plenty of replacement pcb's with ide connectors, which fit the gdrom socket.

    But I'd like to retain the gdrom drive in order to play original games.

    But instead of soldering all wires one by one.. I found out dragoncity also sells: https://dragoncity17.wordpress.com/2018/03/17/sega-dreamcast-gd-ide/

    This will make a nice gdrom socket in the bottom of the existing gdrom-pcb so I dont have to sacrifice it :)

    Jackpot!
     
  9. megavolt85

    megavolt85 Peppy Member

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