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Updated July 1982
By Peter J. Plourd II
PURPOSE: CHANGE is a program designed to convert character sets
foreign to the DEC-system 10. It may be used with any I/O device,
but it is designed to be used with disks and magnetic tapes.
PROCEDURE: CHANGE may be run by typing the following:
The user may now proceed in one of two ways:
1. Write the command lines directly after CHANGE responds
with an angle bracket
2. Enter the Dialog mode, CHANGE will specifically ask for
all information needed to do the required character set
conversions. This method is recommended for all users
not familiar with CHANGE and its command formats.
COMMANDS: All of the commands are for use with the first method
DATA Specify the name of the data file to be used as in
a normal command string "DATA=DEV:FILE.EXT[P,PN]".
EXIT Terminate the program.
HELP This little message.
BYE Call LOGOUT into core and execute it.
RETAIN Allows the user to accumulate commands.
RUN Perform the current command string.
ERASE Erase retained commands.
PRINT Print the current command string.
SWITCHES: These may be used with either of the above methods.
DIALOG mode will prompt the user for all switches
that are required, while in the command mode the
user must supply all necessary switches.
Buffers:x Use x buffers.
Advance:x Advance x files before operation.
Backspace:x Backspace the tape x files before operation.
Block:x Set blocking factor to x.
Record:x Set record size or size of largest block to x.
Density:arg Set mag-tape density to arg [arg=200,556,800].
Retain Retain the following commands.
Run Perform the current command and retain it.
Help These few hints.
Label:arg Set label type as described below for mag-tape.
Mode:arg Set file character set as described below.
Parity:arg Set mag-tape parity [odd=odd, even=even, default=odd].
Password:arg Set the password for GE labels.
Reel:x Set serial number in labels that have this feature.
* Industry Initialize for industry compatible 9-channel tape.
* Scan Scan tape for file named.
* Error Don't ignore checksum and parity errors.
* Span Records cross blocks [implied if "/block:0"].
* Rewind:arg Rewind tapes [arg=before, after, always, omit]
* Unload Unload tape after operation.
* Tell Type file names on a wild card search.
* List List the device directory.
* Flist List the device directory [file names only].
* Header Print headers on the line printer.
* Crlf Ascii file has crlf's.
Note: To turn a switch off concatenate "no" with the switch.
Switches flagged with an (*) have this feature.
/Label - switch modifiers:
None Mag-tape has no labels just data [default].
Mine Special labels for DECsystem-10.
Digital Process labels as standard DIGITAL labels.
Burroughs Process labels as standard BURROUGHS labels.
IBM Process labels as standard IBM labels.
GE635 Process labels as standard GE-635 labels.
Note: Labels are written in the mode specified except for IBM
and GE-635 labels. IBM labels are written in BCD for
7-track drives and EBCDIC for 9-track drives. GE-635
labels are always written in GE-BCD.
/Mode - switch modifiers:
ASCII File character set is 7-bit ASCII.
HPASCII File character set is 8-bit ASCII.
GEASCII File character set is 9-bit ASCII.
IMAGE File is read and written as 36-bit words.
SIXBIT File character set is SIXBIT.
FIXSIX File character set is SIXBIT with no control words.
BCL File character set is BCL.
BCD File character set is BCD.
CDC File character set is cdc bcd.
GEBCD File character set is GE-BCD.
HONBCD File character set is HONEYWELL BCD.
EBCDIC File character set is fixed EBCDIC.
VEBCDIC File character set is variable EBCDIC.
The end of the input record is determined by the mode of the
input file as described below:
ASCII Terminated by a carriage-return character or record count.
SIXBIT Determined by the header word in front of each record.
FIXSIX Always copies the number of bytes specified by the record size.
BCL Always copies the number of bytes specified by the record size.
BCD Always copies the number of bytes specified by the record size.
EBCDIC [Fixed] Always copies the number of bytes specified by the
EBCDIC [Variable] Determined by the header word in front of each
In general all commands may be abbreviated to any number
of characters that will allow that command to be unique. However
no more then six characters are checked for validity in any of
The character "*" may be used to denote a wild card for files
on mag-tape, disk, or dectape. The character "@" denotes a
command file which change will read for commands. If only
an altmode is typed change will enter dialog mode.