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This chapter describes how to program the optional keyboard. Topics include:
•
A description of the keyboard
•
A list of the codes the keyboard transmits to the host
•
A description of the commands that affect the keyboard’s operation
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The optional keyboard has keys similar to those on a typewriter, with the addition of some
special keys. The keyboard contains standard keys, a Setup key, cursor control keys, special
function keys, and an auxiliary keypad.
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The standard keys generate ASCII codes, and have the names of ASCII characters printed on the
keycaps.
Following are some general descriptions of some of the non-numeric keys. Note that the function
of most of these keys is ultimately determined by the application software running on the host
computer. The ASCII codes sent to the host computer by the non-alphanumeric standard keys are
shown in Table 7-1.
The Back Space key normally causes the cursor to move one space to the left.
The Break key generates a short break when pressed alone, or a long break when pressed in with
the Shift key. The Break key normally resets the communication interfaces with a device
attached to the TCS. However, the function of the Break key is determined by the types of
peripherals connected to the TCS and the application software running on the host computer.
(For more information, see Send Short Break Command and Send Long Break Command, later in
this chapter.)
The Delete key normally moves the cursor one space to the left, deleting the character that
occupied the space.
The Return key sends either the ASCII code <CR> (0D Hex) or the ASCII code sequence <CR>
<LF> (0D 0A Hex) to the host, depending on the state of the New Line Mode. See New Line
Mode Command, in Chapter 5.
The Return key normally moves the cursor to the first column of the next line. However, the
action caused by sending <CR> or <CR> <LF> to the host computer is determined by the
application software running on the host computer.
The Shift key alone does not generate a code. It is used with other standard keys to send
uppercase characters, by holding down Shift while pressing another key. The uppercase
characters include capital letters and uppercase symbols.
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