Method and apparatus adaptable to a standard game port of a personal computer for interfacing an external HSP modem, a joystick and a MIDI interface
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United States of America Patent
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Aug 13, 2002
Grant Date -
N/A
app pub date -
Jan 6, 1999
filing date -
Jan 6, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A new protocol of a standard game port for interfacing an external HSP modem, and game port devices is disclosed. The invention provides an external HSP modem housed in a compact case which includes a connector for mounting on a PC game port and a connector for coupling to a joystick and a MIDI interface. Inside the case, a bridge module is coupled to a modem module to forward the modem data input in response to a plurality of serial port clocks. The modem data input is then forwarded to an encode/decode module via multiple redefined read-only ports. The encode/decode module is on a sound chip for restoring the modem data input to their original formats. The restored data will be forwarded to a system bus for CPU to access via an HSP modem interface. The signal transmissions for the joystick and the MIDI I/O device are basically the same because the bandwidth of the game port is still enough if the modem, the joystick, and the MIDI I/O device are operated simultaneously. Consequently, the invention allows a computer system to simultaneously communicate with an HSP modem, and game port devices without burdening down the system performance.
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