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  • IBM TDB - Conversion Connector for the IBM Personal Computer [clone flo

    From Louis Ohland@21:1/5 to All on Sun Oct 17 11:54:56 2021
    Image is poor quality, but I'd bet it can be figured out.

    https://priorart.ip.com/first-page/IPCOM000111811D

    Conversion Connector for the IBM Personal Computer Described is a
    hardware implementation to enable industry standard diskette drive edge connectors to connect to the IBM Personal Computer (PC) and IBM PS/2*
    diskette drive cable connectors.

    Fig. 1 shows the interface conversion circuitry required to enable the
    2X17 card edge connector to be wired to the industry standard Berg
    connector. Fig. 2 shows the wiring designation for the thirty-four pins
    of the IBM connector and the Berg connector.

    With this interconnection, the printed circuit card with the appropriate connectors and circuits will allow the signal conversion and connection
    of an IBM PC flat ribbon cable for floppy disk drives to connect to any industry standard card edge Input/Output (I/O) connector, as required
    for diskette drives.

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From gfretwell@aol.com@21:1/5 to All on Sun Oct 17 18:08:47 2021
    On Sun, 17 Oct 2021 11:54:56 -0500, Louis Ohland <ohland@charter.net>
    wrote:

    Image is poor quality, but I'd bet it can be figured out.

    https://priorart.ip.com/first-page/IPCOM000111811D

    Conversion Connector for the IBM Personal Computer Described is a
    hardware implementation to enable industry standard diskette drive edge >connectors to connect to the IBM Personal Computer (PC) and IBM PS/2* >diskette drive cable connectors.

    Fig. 1 shows the interface conversion circuitry required to enable the
    2X17 card edge connector to be wired to the industry standard Berg
    connector. Fig. 2 shows the wiring designation for the thirty-four pins
    of the IBM connector and the Berg connector.

    With this interconnection, the printed circuit card with the appropriate >connectors and circuits will allow the signal conversion and connection
    of an IBM PC flat ribbon cable for floppy disk drives to connect to any >industry standard card edge Input/Output (I/O) connector, as required
    for diskette drives.

    How do they deal with the pin 2 problem? Industry drives have a media
    switch that sends a signal to the controller. IBM drives have no
    switch and the media type is selected by the software/controller.
    (Prior to the second generation PS/2s)
    Basically you can put any media in an IBM drive and format it any way
    you like. The controller has no clue what you are feeding it. On
    reading a written disk it looks at the media descriptor byte in the
    boot sector.

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)