1. Forum
  2. Usenet
  3. COMP.SYS.IBM.PS2.HARDWARE

  • M-ACPA and MIDI out

    From Louis Ohland@21:1/5 to All on Sun Jun 11 11:35:27 2023
    I am curious, blue. Can the M-ACPA output MIDI over a serial port on a
    Type 3 serial port? The Type 3 supports the MIDI rate of 31,250, -BUT-
    MIDI is not straight RS-232.

    The MIDI Physical Layer http://personal.kent.edu/~sbirch/Music_Production/MP-II/MIDI/midi_physical_layer.htm

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From moussa@21:1/5 to Louis Ohland on Mon Jun 12 11:20:47 2023
    On 12/6/23 00:35, Louis Ohland wrote:
    I am curious, blue. Can the M-ACPA output MIDI over a serial port on a
    Type 3 serial port? The Type 3 supports the MIDI rate of 31,250, -BUT-
    MIDI is not straight RS-232.

    The MIDI Physical Layer http://personal.kent.edu/~sbirch/Music_Production/MP-II/MIDI/midi_physical_layer.htm

    max232 it??

    --
    Moussa

    "People alike with a similar circumstances, tend to find each
    others across space and time, given enough time in life, no
    matter distance, language, race, colour and believes" (c) MEK
    *** Do Not Copy, Duplicate or Use without my Permission ***

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From moussa@21:1/5 to Louis Ohland on Mon Jun 12 11:22:36 2023
    On 12/6/23 00:35, Louis Ohland wrote:
    I am curious, blue. Can the M-ACPA output MIDI over a serial port on a
    Type 3 serial port? The Type 3 supports the MIDI rate of 31,250, -BUT-
    MIDI is not straight RS-232.

    The MIDI Physical Layer http://personal.kent.edu/~sbirch/Music_Production/MP-II/MIDI/midi_physical_layer.htm
    https://response-box.com/gear/decabox-rs232-to-midi/
    --
    Moussa

    "People alike with a similar circumstances, tend to find each
    others across space and time, given enough time in life, no
    matter distance, language, race, colour and believes" (c) MEK
    *** Do Not Copy, Duplicate or Use without my Permission ***

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From moussa@21:1/5 to Louis Ohland on Mon Jun 12 11:23:46 2023
    On 12/6/23 00:35, Louis Ohland wrote:
    I am curious, blue. Can the M-ACPA output MIDI over a serial port on a
    Type 3 serial port? The Type 3 supports the MIDI rate of 31,250, -BUT-
    MIDI is not straight RS-232.

    The MIDI Physical Layer http://personal.kent.edu/~sbirch/Music_Production/MP-II/MIDI/midi_physical_layer.htm
    https://www.compuphase.com/electronics/midi_rs232.htm
    --
    Moussa

    "People alike with a similar circumstances, tend to find each
    others across space and time, given enough time in life, no
    matter distance, language, race, colour and believes" (c) MEK
    *** Do Not Copy, Duplicate or Use without my Permission ***

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From moussa@21:1/5 to Louis Ohland on Mon Jun 12 11:27:25 2023
    On 12/6/23 00:35, Louis Ohland wrote:
    I am curious, blue. Can the M-ACPA output MIDI over a serial port on a
    Type 3 serial port? The Type 3 supports the MIDI rate of 31,250, -BUT-
    MIDI is not straight RS-232.

    The MIDI Physical Layer http://personal.kent.edu/~sbirch/Music_Production/MP-II/MIDI/midi_physical_layer.htm
    who knew??
    https://hackaday.io/project/179964-mpu-232-rs-232-midi-interface
    --
    Moussa

    "People alike with a similar circumstances, tend to find each
    others across space and time, given enough time in life, no
    matter distance, language, race, colour and believes" (c) MEK
    *** Do Not Copy, Duplicate or Use without my Permission ***

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From moussa@21:1/5 to Louis Ohland on Mon Jun 12 13:19:50 2023
    On 12/6/23 00:35, Louis Ohland wrote:
    I am curious, blue. Can the M-ACPA output MIDI over a serial port on a
    Type 3 serial port? The Type 3 supports the MIDI rate of 31,250, -BUT-
    MIDI is not straight RS-232.

    The MIDI Physical Layer http://personal.kent.edu/~sbirch/Music_Production/MP-II/MIDI/midi_physical_layer.htm
    http://www.ucapps.de/midibox_to_com.html
    --
    Moussa

    "People alike with a similar circumstances, tend to find each
    others across space and time, given enough time in life, no
    matter distance, language, race, colour and believes" (c) MEK
    *** Do Not Copy, Duplicate or Use without my Permission ***

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Louis Ohland@21:1/5 to moussa on Mon Jun 12 06:07:17 2023
    Serial Port Controller (HITR chapter, PDF) https://www.ardent-tool.com/docs/pdf/ibm_hitrc08.pdf

    page 45

    The voltage levels are EIA-232-D only.
    Current loop interface is not supported.

    https://www.compuphase.com/electronics/midi_rs232.htm
    "MIDI uses a current loop signal line (5mA, usually at approximately
    5V), rather than the standard voltage level signals. A logic 0 is
    defined as current flowing, and a logic 1 as no current."

    I'm no EE, BUT this circuit uses a MAX232, and my SWAG is there is no
    "current loop" between the Serial port and the MAX232.

    "The closest that most serial cards and/or drivers inside PCs can come
    to the MIDI Baud rate is 28800 or 38400 Baud —exceeding the 1% margin
    that MIDI defines"

    Not true for Type 3 DMA Serial ports. 31,250 baud is -directly-
    supported.

    moussa wrote:
    On 12/6/23 00:35, Louis Ohland wrote:
    I am curious, blue. Can the M-ACPA output MIDI over a serial port on a
    Type 3 serial port? The Type 3 supports the MIDI rate of 31,250, -BUT-
    MIDI is not straight RS-232.

    The MIDI Physical Layer
    http://personal.kent.edu/~sbirch/Music_Production/MP-II/MIDI/midi_physical_layer.htm

    https://www.compuphase.com/electronics/midi_rs232.htm

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