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Thread: Did ever exist an 8-bit ISA card for ATA (IDE) hard drives?

  1. #21
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    JDR Microdevices sold an 8-bit IDE card, this one has a limit of 528MB drives

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  2. #22
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    Quote Originally Posted by mikey99 View Post
    JDR Microdevices sold an 8-bit IDE card, this one has a limit of 528MB drives
    Could that limit not be broken by Dynamic Drive Overlay (DDO) software such as EZBIOS, as you would do on later AT+ machines?

  3. #23
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    Quote Originally Posted by Scali View Post
    Could that limit not be broken by Dynamic Drive Overlay (DDO) software such as EZBIOS, as you would do on later AT+ machines?
    Recall that DDO's use their own low-level driver, not the BIOS one.

    I doubt that the I/O port mappings directly correspond to a standard ATA setup. There's usually some sort of adaptation employed to handle the 16-bit to 8-bit translation. In particular, note the 2Kx8 SRAM--that's not part of a usual ATA adapter.
    Last edited by Chuck(G); June 20th, 2017 at 07:43 AM.

  4. #24
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    Don't forget there were also many "hardcards" which marry the drive and controller onto the card. Does that qualify? Not sure if you can decouple them and wire up a different drive to the card, but there's an 8-bit IDE-ish HDD adapter for you.

    The only period-appropriate 8-bit IDE adapter I own is a Silicon Valley ADP50. The rest are XT-IDE variants of various flavors.
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  5. #25
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    It depends. A lot of "hard cards" used 3.5" MFM/RLL drives with a bog-standard controller.

  6. #26

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    Quote Originally Posted by Chuck(G) View Post
    It depends. A lot of "hard cards" used 3.5" MFM/RLL drives with a bog-standard controller.
    And Tandy's "SmartDrive" hardcards used a Seagate ST-05X or an equivalent Western Digital IDE-XT interface card.

  7. #27

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    Quote Originally Posted by Trixter View Post
    The only period-appropriate 8-bit IDE adapter I own is a Silicon Valley ADP50. The rest are XT-IDE variants of various flavors.
    Another period-appropriate card was the AccuLogic sIDE-1/16.

    The sIDE-1 was an IDE-XT (XTA, 8-bit IDE, whatever you want to call it...) card while the sIDE-1/16 was to use regular IDE-AT / ATA drives with an XT-class machine.


  8. #28
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    Quote Originally Posted by mikey99 View Post
    JDR Microdevices sold an 8-bit IDE card, this one has a limit of 528MB drives

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    I've got several other cards from that company including a 4HD floppy card in 8bit isa. I tried for years to find their 8bit IDE card but could never find one except at insane pricing.

    Nice looking board...

    framer

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