Table of Contents
Advertisement
SECTION III
OPERATION
3.1 GENERAL
The ADM 5 is used to enter, display, and send
information to a host computer. It performs a
similar function by accepting information
from the host and displaying the information
on the CRT screen or acting on control
information. In this section of the manual,
the various keys and specific control codes are
described.
3.2 KEYBOARD OPERATION
The operator uses a keyboard very similar to
the keyboard of a teletypewriter to enter data.
Information typed by the operator may be
displayed on the CRT screen immmediately,
as during Half-Duplex, operation, or as an
echo from the remote computer, as during
Full-Duplex operation.
Figures 3-1A and 3-1B show the layout of a ,
standard ADM 5 keyboard. Functionally, the
keyboard consists of displayable character
keys and special function keys. Some of the
special function keys can also be used in
conjunction with" certain displayable
character keys to command specific control
operation. All keys repeat automatically
when held down longer than approximately
400 milliseconds.
In the standard ADM 5, 96 characters
(including space) are displayed. These
include upper and lower case alphabet,
numbers, punctuation marks, and most
symbols. For special applications, usually at
the discretion of the Programmer, all 128
ASCII characters may be displayed in
Program Mode. Control characters (CR, LF,
FS, etc.) are written as they are typed, and the
appropriate symbols are displayed. For
example: CR, LF, and FS would be displayed
as CR, LF, and FS.
DP319
3-1
Not.
Typing at the keyboard always
generates codes which are
transmitted. However, in order for
characters to be displayed and for
control codes to affect the ADM ,5
in FDX Mode, the characters must
be echoed back from the host
computer. All display actions
described below assume that the
generated codes are properly
echoed.
Except for a number of special operation keys,
the keyboard is equipped with key roll-over
protection (i.e. each key which is pressed must
be released before the next key code can be
produced).
"The keyboard contains the following
functional keys:
• Terminal control keys
• Lower and upper case alpha characters
• Numeric characters on main and
auxiliary keyboards
• Numeric characters with SHIFT (main
keyboard only)
• Special characters
• Special characters with SHIFT
• Operational control keys
3.2.1 Terminal Control Keys
The SHIFT key is similar to the shift key of a
conventional typewriter (refer to Table 3-1,
Item 7). The key is used to produce shifted
ASCII codes associated with upper case
alpha characters (A to Z) and with the upper
symbols of keys capable of producing two
Advertisement
Table of Contents
