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- 8. _M_I_D_I__S_y_s_t_e_m
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- The MIDI execution environment consists of the kernel MIDI
- driver, the MIDI library DSO _l_i_b_m_d._s_o, and the _s_t_a_r_t_m_i_d_i(1)
- and _s_t_o_p_m_i_d_i(1) commands.
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- The MIDI library DSO is installed from the subsystem
- _d_m_e_d_i_a__e_o_e._s_w._l_i_b (or _d_m_e_d_i_a__e_o_e._s_w_3_2._l_i_b for n32
- applications).
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- The other core MIDI execution environment components are
- installed from the subsystem _d_m_e_d_i_a__e_o_e._s_w._b_a_s_e.
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- The MIDI driver allows applications programs to read or send
- time-stamped MIDI events via one or both of the serial ports
- on an Onyx2, Indy, Power Indigo, Indigo, or Indigo,
- workstation. The MIDI library provides an application
- programming interface to the capabilities of the driver.
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- In order to operate a serial port on your IRIS workstation
- as a MIDI port, you must first connect it to a standard
- Apple Macintosh-compatible serial-to-MIDI interface, such as
- the Opcode Translator ProSync(tm). Many of these interfaces
- offer additional useful features, such as SMPTE time-code
- conversion.
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- Before any MIDI applications can use the serial port, it is
- usually necessary to configure the serial ports for use with
- MIDI. This is done through the System Manager Port Tool.
- Bring up the Port Tool, and connect the desired serial port
- to a MIDI device. To use the port for other devices (such
- as a printer), simply disconnect the port using the Port
- Tool, and then connect to whatever device you desire. The
- name of the MIDI port will be "midiPortX", depending upon
- which serial port you connect to.
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- The MIDI subsystem in IRIS Digital Media Execution
- Environment 6.4 is the same as the version included in the
- 6.2 release.
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- 8.1 _K_n_o_w_n__P_r_o_b_l_e_m_s__a_n_d__W_o_r_k_a_r_o_u_n_d_s
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- +o On Onyx2, the Port Tool can not be used to configure
- serial ports for MIDI. Instead, _s_t_a_r_t_m_i_d_i(1) must be
- run manually. For example, to use serial port 3 for
- MIDI, run
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- ssssttttaaaarrrrttttmmmmiiiiddddiiii ----nnnn ttttttttyyyyMMMMiiiiddddiiii3333 ----ssss 33331111222255550000 ----dddd ////ddddeeeevvvv////ttttttttyyyydddd3333
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- +o External MIDI converter boxes that draw power from the
- SGI workstation's serial port (rather than from an AC
- adapter) may not work reliably.
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- +o MIDI I/O through the serial ports on an O2 workstation
- is not a supported feature at this time. Work is
- underway to provide this feature via a patch in the
- future. Internal (interprocess) MIDI is supported on O2
- systems.
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- +o Machines have been observed to crash as a consequence
- of changing the physical location of cables while MIDI
- is running.
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- It is recommended that changes to the cabling of MIDI
- only be done while the machine is powered down.
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- +o Currently, the MIDI system does not automatically
- synchronize to an external sequencer or drum machine,
- nor does it generate MIDI clocks to synchronize other
- devices.
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- +o Some Indigo^2 machines exhibit erratic behavior when
- receiving system exclusive messages. If you have a
- problem, please contact the TAC (800.800.4SGI).
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