Operation; Introduction; Operator Controls; Function Key Operations - Beehive International B150 Series Operator's Manual

SECTION
OPERATION
3.1 INTRODUCTION
This section provides basic operating instructions
for the B150 series computer terminals. To operate
these terminals efficiently, the operator should be
familiar with instructions contained in this section.
The B150 series terminals should be properly in
stalled in accordance with procedures outlined in
Section II of this manual.
3.2 OPERATOR CONTROLS
The keyboard and key explanations are shown in
Figures 3-1 and 3-2 Operation of any key on the
keyboard causes either character codes, control
codes, or escape sequences to be generated. The
type of code selected by the operator is deter
mined by the key or sequence of the keys which
have been depressed. There are three keys that
are used in a sequence with any alphanumeric key:
To perform an Escape operation, depress and
release the BSC key, followed by the desig
nated alphanumeric key (see Figure 3-2).
To perform a Control function, depress the
CTR L key and hold this key down while
simultaneously typing the alphanumeric key.
If the upper/lower case option is selected, the
SHI FT key is used to generate upper case
codes and is operated the- same as a type
writer shift key.
Some Control codes, generated by depressing a
Function key, produce a single 8-bit code which
is acted upon but not transmitted, e.g., cursor move
3-1
ment controls, SEND, CHARACTER DELETE,
etc. The Escape or Control codes generated by de
pressing the ESC or CTRL keys and an alpha
numeric key produce two 7-bit codes which are
acted upon and also transmitted, e.g., ESC-A, etc.
3.3 FUNCTION KEY OPERATIONS
3L3.1 Control Key Functions
The Control functions may be generated from the
keyboard or by receipt of corresponding commands
from the I/O port. Figures 3-1 and 3-2 provide the
sequence of operation for each Control function
when generated from the keyboard or when received
from the I/O port Table 3-1 depicts the ASCII codes
for each Control function. Control and Escape
codes generated at the keyboard by depressing the
function keys are single 8-bit codes. The Control
and Escape codes generated as a Control or Escape
code sequence at the keyboard or received at the
I/O port consist of two 7-bit words.
332 Escape Key Functions
The Escape functions may be generated from the
keyboard or by receipt of the proper escape func
tion sequences from the I/O port. The common
Escape functions include:
• The ESC-m sequence terminates entry of data
into a blink field.
• The ESC-I sequence allows data entered into
(continued page 3-4)