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     When SYSIN is specified, all format 1 ACCEPT statements which either
     have no FROM option, or specify FROM SYSIN (or the mnemonic name
     associated with SYSIN) are transformed into READ statements from a
     file with external name SYSIN.
 
     Similarly, all EXHIBIT statements and all format 1 DISPLAY statements
     which either have no UPON option or specify UPON SYSOUT are transformed
     into WRITE statements to a file with external name SYSIN.
 
     These files are line sequential, use the ASCII character set, with
     SYSIN having a record length of 80 bytes and SYSOUT 132 bytes.
     Their names can be mapped onto physical file-names either by using
     environment variables or the External File Mapper, MFEXTMAP.
 
     If SYSIN is specified, all output arising from using the TRACE
     directive will be directed to the SYSOUT file.
 
     See also: ◄TRACE directive►
               ◄ACCEPT statement, format 1►
               ◄DISPLAY statement, format 1►
               ◄EXHIBIT statement►
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