Manual

Introduction to Programming
Chapter 10
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(2) Leader Section
The information between the tape start and the program start is called the
tape leader section. The leader section is a tape indexing section. On
punched tape, the holes punched in the leader section can be configured to
show alphanumeric characters. The control ignores information within the
leader section and does not perform a parity check on this information.
Important: A program start code must not appear within the leader
section. If the program start code appears, the control starts reading
information and assumes that it is the part program. This causes parity
errors or “nonsense” codes to be read in by the control.
(3) Program Start Code
The first end-of-block code (EOB code) after the leader section indicates
the beginning of the part program. The EOB code is designated with:
line feed (LF) ---- ASCII format
carriage return (CR) ---- EIA format
Important: When performing an EOB search, the search is executed from
the beginning of the part program, NOT from the point of display.
(4) O-Word Program Name
The program name, if on the tape, must follow the program start code.
When outputting to tape the program name can be determined by:
Program Name: If:
Manually keyingin theprogram name ----
Selected from the first blockof the
program
No name has beenmanually keyedin andthe first
block containsan O-word, : (forEAI format), or N-word
after theprogram start code.
Selected from the program directory No namehas beenmanually keyed in andno name
exists inthe first blockof the program. For the program
name to be taken from thedirectory screenthe program
must be stored on that directory with theletter O
followed by up to5 numericdigits. In thiscase the
control generatesan O-wordblock asthe first blockof
the program written totape.
No name is used Aprogram will bestored on tape with no program name
if none of the above naming conditions aremet.
(5) Part Program Section
A part program is made of blocks of information. Individual blocks
contain words that the control can interpret. Individual words are made up
of an address with a numeric value. For details on words and addresses,
see the remaining sections of this chapter.