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IMP library modifications for terminal I/O 
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Allan Vernon   21st October 1982
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A version of the IMP Library with modifications in terminal I/O
handling is now available for test.  To access the new I/O procedures,
programs should be linked with DR3:[IMP.LIB]IOREWRITE.OBJ.

     i.e.   $ LINK file,DR3:[IMP.LIB]IOREWRITE

N.B. Do NOT use RLINK or SLINK.

Terminal operating modes are selected via the following procedures.



1. SET TERMINAL MODE

  Specification :   %externalroutinespec SET TERMINAL MODE(%integer MODE)

  Definition :  Sets terminal I/O mode to that specified in MODE.

  Bit Significance :  For any call of SET TERMINAL MODE, all mode bits 
                      are considered "active" -  '1' selects an option,
                      '0' clears it.

                      The default mode setting is '0'.

  12                                   0
  $_$_$_$_$_$_$_$_$_$_$_$_$_$_$_$_$_$_$_$_$_$_$_$_$_$_$_$_$_$_$_$_$_$_$_$_$_$_$_
  |  |  |  |  |  |  |  |  |  |  |  |  |  |
  |$_$_|$_$_|$_$_|$_$_|$_$_|$_$_|$_$_|$_$_|$_$_|$_$_|$_$_|$_$_|$_$_|
   |  |  |  |  |  |  |  |  |  |  |  |  |            
   |  |  |  |  |  |  |  |  |  |  |  |  Enter single char input mode
   |  |  |  |  |  |  |  |  |  |  |  |
   |  |  |  |  |  |  |  |  |  |  |  Convert lower to upper case on input
   |  |  |  |  |  |  |  |  |  |  |  
   |  |  |  |  |  |  |  |  |  |  Disable echoing
   |  |  |  |  |  |  |  |  |  |  
   |  |  |  |  |  |  |  |  |  Pass DEL, ^U and ^R
   |  |  |  |  |  |  |  |  |  
   |  |  |  |  |  |  |  |  Purge type-ahead before read operations
   |  |  |  |  |  |  |  |  
   |  |  |  |  |  |  |  Don't echo terminator
   |  |  |  |  |  |  |  
   |  |  |  |  |  |  Accept any char <32 as terminator
   |  |  |  |  |  |  
   |  |  |  |  |  Don't signal event 9 on end of input
   |  |  |  |  |  
   |  |  |  |  Don't convert all terminators to LF
   |  |  |  |  
   |  |  |  Don't convert LF to CR
   |  |  |  
   |  |  Don't convert CR to LF
   |  |  
   |  Don't flush output before read operations
   |  
   Don't buffer output.
                                                                 P.T.O
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2.  CURRENT TERMINAL MODE

  Specification :  %externalintegerfnspec CURRENT TERMINAL MODE


  Definition :  Returns current terminal mode setting.

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