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A: Technical Specifications
Macintosh to MIDI Converter (DB-9 Female to MiniDIN-8 Female)
The Silicon Graphics Macintosh to MIDI converter converts the O2+ workstation’s
RS-232 Transmit Data and Receive Data signals to RS-422-like signalling used by MIDI
devices to connect to Apple Macintosh serial ports.
Table A-16 shows the pinouts for the O2+ workstation end.
Table A-17 shows the pinouts for the MIDI interface end.
Table A-16 Macintosh to MIDI Converter (DB-9 Female): Workstation End
Workstation Signal
Description Pin Number
Voltage with Regard to Ground Required from or Supplied
to Workstation
DCD 1 Passed through from GPi
RXD 2 Supplies 0V typical low, +5V typical high
TXD 3 Requires 0V maximum low, 1.6V minimum high (RS-423)
DTR 4 Requires -12V maximum low to +12V minimum high
SG 5 0
DSR 6 Not connected
RTS 7 Requires +12V to power the converter
CTS 8 Passed through from handshake in
RD 9 Not connected
Table A-17 Macintosh to MIDI Converter (MiniDIN-8): MIDI Interface End
Macintosh Signal
Description Pin Number
Voltage with Regard to Ground Supplied to or
Required from MIDI Interface Unit
GPi 7 Passed through to DCD
RXD 5(-) and 8 Requires -0.2V maximum low, 0.2V minimum high
TXD 32(-) and 6 Supplies -5V typical low, +5V typical high
HANDSHAKE OUT 1 Supplies -5V typical low, +5V typical high
SIGNAL GROUND 4 0
HANDSHAKE IN 2 Passed through to DCD
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