PC (IV)                      3/15/72                      PC (IV)

NAME            pc  --  PC-11 paper tape reader/punch

DESCRIPTION     ppt refers to the PC-11 paper tape reader or

                punch, depending on whether it is read or writ-


                When ppt is opened for writing, a 100-character

                leader is punched.  Thereafter each byte written

                is punched on the tape.  No editing of the char-

                acters is performed.  When the file is closed, a

                100-character trailer is punched.

                When ppt is opened for reading, the process waits

                until tape is placed in the reader and the reader

                is on-line.  Then requests to read cause the

                characters read to be passed back to the program,

                again without any editing.  This means that sev-

                eral null leader characters will usually appear

                at the beginning of the file.  Likewise several

                nulls are likely to appear at the end.  End-of-

                file is generated when the tape runs out.

                Seek calls for this file are meaningless.

FILES           /dev/ppt

SEE ALSO        --

BUGS            --