REFERENCE GUIDE

Communication functionsCommunication functions carry out communications through thesystem's serial and parallel I/O ports. The following list brieflydescribes each communication function:FunctionBuildCommDCBClearCommBreakCloseCommEscapeCommFunctionFlushCommGetCommErrorGetCommEventMaskGetCommStateOpenCommReadCommSetCommBreakSetComm EventMaskSetCommStateTransmitCommCharUngetCommCharWriteCommDescriptionFills a device control block with controlcodes.Clears the communication break state froma communication device.Closes a communication device aftertransmitting the current buffer.Directs a device to carry out an extendedfunction.Flushes characters from a communicationdevice.Fills a buffer with the communicationstatus.Retrieves, then clears, an event mask.Fills a buffer with a device control block.Opens a communication device.Reads the bytes from a communicationdevice into a buffer.Sets a break state on the communicationdevice.Retrieves and then sets an event mask onthe communication device.Sets a communication device to the statespecified by the device control block.Places a character at the head of thetransmit queue.Specifies which character will be the nextcharacter to be read.Writes the bytes from a buffer to acommunication device.Sound functionsSound functions create sound and music for the system's soundgenerator. The following list briefly describes each soundfunction:FunctionCloseSoundDescriptionCloses the play device after flushing thevoice queues and freeing the buffers.142Software development kit