4-5 TAPE RECORDING OPERATIONS

Before initiating a record or playback operation, check that the desired cassette is in the RECORD or PLAYBACK mode. If not, actuate the RECORD/PLAYBACK switch (top row of switch panel) as necessary (RECORD CONTROL and PLAYBACK CONTROL must be OFF, and there should be no tape motion). The state of each tape b. 86 eight-bit characters

c. Two unused characters (8 bits each) d. Postamble (8 bits).

A block of data is terminated and recorded on tape from the record buffer after one of the following events:

a. buffer (LINE tape format only).

c. The RECORD CONTROL OFF switch (switch panel middle row) is actuated with data still in the record buffer (LINE or CONTinuous format). Unfilled character positions of that block are filled with null characters.

If fewer than 86 characters are entered into the record easy operation. Line and continuous formats are chosen by setting the TAPE FORMAT CONT /LINE switch (switch panel middle row).

4-5.2 RECORDING LIMITATIONS. In the LINE tape format, it is possible to receive data from the line at a faster rate than it can be recorded. For example, at 30 characters-per-second transmission rate, a carriage return can be sent (causing a block to be written) in ASCII code

A block counter within the cassette controller allows up to 16 blocks to be remembered, giving the recorder greater flexibility. If all blocks transmitted to the recorder require at least 250 milliseconds to transmit (250 milliseconds between carriage returns), the recorder will never lose data.

If a string of blocks are to be transmitted which requires less than 250 milliseconds between them (less than 250 milliseconds between carriage returns), the following formula must be followed to prevent loss of data.

where,

4-5.4 RECORDING THE BUFFER DATA. Data is terminated by a carriage return.

b. If 86 characters are received in the record buffer (filling a data block), the data in the buffer will be written on tape when the 86th character is received in either line or continuous tape format. The 87th character will then block in continuous format.

In all cases, the block will be recorded on tape as 86 characters. The record control automatically fills out the block to 86 characters with null characters if there are less than 86 characters in the block.

4-5.5 INSPECTING CONTENTS OF RECORD BUFFER.

If RECORD and PRINTER (switch panel lower row) are set to LOCAL, the contents of the record buffer can be printed out for inspection before recording on tape. By pressing PRINT (panel second row), the printer will print out the buffer contents. By using the keyboard and tape forward and reverse keys (TAPE, TAPE), the contents can be

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changed (explained in paragraph 4-5.8).

4-5.6 ERASING ENTIRE RECORD BUFFER. The contents of the entire record buffer (one block) can be erased by actuating the ERASE switch. This can be done only if RECORD is set to LOCAL. This operation clears the record buffer but does not affect data already on tape.

4-5.7 TERMINAL SETUP. Before initiating a record operation, check the following conditions:

a. Set the terminal ON-LINE switch (adjacent to loaded (described in paragraph 4-4).

NOTE

If the cassette write tabs are removed, the tape will not load in the RECORD mode.

c. Set the a p pro p ria t e cas set t e RECORD/PLAYBACK switch (upper row, switch panel) to RECORD. The RECORD CONTROL switch must be OFF

To initiate recording, set the RECORD CONTROL to ON.

If the ON indicator lamp does not glow, recheck the terminal setup.

4-5.8 EDITING WHILE RECORDING. When recording in the local mode from the keyboard to the tape or from tape to tape (duplication), changes can be made to the data in the record buffer (before recording on tape) using the TAPE and TAPE keys located on the keyboard.

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a. Set all four bottom row switch-panel switches to LOCAL.

o. Load and ready tapes so that the READY I am p s illuminate (paragraph 4-4.4). Set RECORD CONTROL to ON. Begin recording.

c. To change a character, use the CHARACTER display to determine (in ASCII code) the character being "addressed." If recording from keyboard to tape with the printer, it will be the last character typed and will also be the character immediately to the left of the printhead. If a new character is entered, this character will be inserted immediately after the addressed character. For example, if you wish to change the "3" in the series '''1234,'' use TAPE to read the "2" in the CHARACTER

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display (the left edge of the printhead will cover the 3 with the 2 showing immediately to the left). By pressing a new character, the 3 will

d.

e.

f.

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be changed. When a printable-character key is pressed, the printer first prints the character, then shifts one space to the new address.

When at the correct address, type in the new character (or retype the remainder of the line).

After changing one or several characters, use TAPE to return to the end of the line where

~ ;yping can continue or the block can be entered on tape (use a technique in paragraph 4-5.1).

New characters can replace old characters only on a character'-for-character basis. If additional characters are to be inserted, retype the remainder of the line.

If you wish to check the block before entering on tape, press PRINT (second row of switch panel). The buffer will be printed out, but buffer contents will not be affected. To print on a clean line with the printhead starting at the left margin, first press PAPER ADV (no code will be transmitted).

To change an entire line, press ERASE (switch panel middle row), PAPER ADV (to return printhead to left margin), and retype new line.

,..--_ _ _ CASSETTE 1 CASSETTE 2

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STOP STOP ~ ^{PLAYBACK --J L - - RECORD}

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B

RECORD CONTROL

CHARACTER PRINT ON

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