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1 HPX
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HPX transfers data files between the computer and the HP2648a terminal display
or tape cartridges. Four types of command are available:
.NF.LM+15.P-8
Copy disk file(s) to terminal device(s):
$ HPX device-spec[s]=input-files[/AS][/BI]
.P
Copy from terminal device to disk file:
$ HPX output-file[/SP][/AP]=device-spec[/AS][/BI]
.P
Compare device with disk file:
$ HPX file[/SP]=device-spec[/AS][/BI]/CMP
.P
Position tape only:
$ HPX [/RT:n][/LT:n]
.LM-15.F.P0
HPX does not support intra-device transfers, as these can be done locally.
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Valid devices are_: /DI = screen display, /LT = left tape, /RT = right tape.
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Subtopic Device__specifications gives further details on device selection and
control.
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Subtopic Switches gives information on other switches.
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2 Device__specifications
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device-specs are:
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/DI	Screen display
/LT:n	File n on left tape (default n = next file)
		unsigned n is absolute,
		signed n is relative to current position.
/LT:A	Append to end of last file on tape.
/LT:C	Condition tape and rewind to first file.
/LT:E 	Start a new file after last file on tape.
/LT:R	Rewind tape to start at first file.
/RT:x	As above, for right tape.
/PR	Printer
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2 Switches
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Switches (other than Device__specifications, q.v.) are:
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/AS	ASCII data to be transferred = /-BI [default]
/BI	Binary transfer mode required = /-AS
/FO	Flag output file as having FORTRAN carriage-control
/SP	Spool output file
/AP	Append output to existing file
/LA	Latch current switch settings for next command line
/WBR	Use write-backspace-read mode
/-WBR	Don't use write-backspace-read mode
/CMP	This is a compare operation
/-CMP	This is a copy operation [default]
/LI	List file(s) copied if wildcards or 1 input file [default]
/-LI	Don't list file(s), even if wildcards etc. 
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