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IRIX Installation Tools & Overlays 2001 May
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SGI IRIX Installation Tools & Overlays 2001 May - Disc 3.iso
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dmedia_eoe
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ch08.z
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2001-04-16
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- 1 -
8. _M_I_D_I__S_y_s_t_e_m
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.
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).
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.
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.
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.
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.
The MIDI subsystem in IRIS Digital Media Execution
Environment 6.4 is the same as the version included in the
6.2 release.
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
+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
ssssttttaaaarrrrttttmmmmiiiiddddiiii ----nnnn ttttttttyyyyMMMMiiiiddddiiii3333 ----ssss 33331111222255550000 ----dddd ////ddddeeeevvvv////ttttttttyyyydddd3333
- 2 -
+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.
+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.
+o Machines have been observed to crash as a consequence
of changing the physical location of cables while MIDI
is running.
It is recommended that changes to the cabling of MIDI
only be done while the machine is powered down.
+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.
+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).