Beehive International B150 Series Operator's Manual page 23

in which the cursor cannot be positioned and no
data entered. The Protected Fields are differen
tiated from variable data by being displayed in half
intensity. The display of the half intensity data can
be internally selected to operate in one of two ways.
First, the half intensity can be enabled continuously
without regard to the state of the FORMAT MODE,
j-ldwever, the display of the lower intensity can be
strapped to follow the FORMAT MODE. That is,
if the display is not in FORMAT, all data would be
displayed in normal intensity, and would only go to
lower intensity if the data is truly protected. If in
the FORMAT MODE the display will not roll if
the cursor is taken off the bottom line of the dis
play. In <h\s situation, the cursor recycles to the
top line.
3.10 FORMAT TAB
In FORMAT MODE, the cursor moves from one
Unprotected Field to another as the FORMAT
TAB key is depressed. If the cursor is located in
the last unprotected Field when the TAB key is
depressed, the cursor moves through the Home
position. If the Home position is protected, the
cursor moves forward to the first unprotected
position on the screen. If the Home position is
unprotected, the cursor will remain there.
3.11 MEMORY AND DISPLAY ORGANIZATION
The BIbO series terminals have 1920 displayable
character locations. Characters are stored in the
memory on a line basis, 80 characters per line. Ihe
lines in the memory are organized on a page basis
where 24 lines make up one page. The memory
location where the next character will be stored is
marked by the cursor. Oiaracter codesalreadyen
tered can bereplaced byaspace orany othercode. If
If the cursor is advanced beyond the end ofdisplay
and the terminal is in FORMAT MODE, the display
will not -jcroll and the cursor returns to the first
unprotected field at the top of the display. If not
in the ; ORMAT MODE, and the cursor is advanced
beyond the end of the display, the cursor remams
on the last line an: ' 2display scrolls up a line.
Writing be/ond the end of the display orscrolling
the display causes the loss of the data on the first
line If the line in memory has less than 80 charac
ters', the displayed line has ASCII Null codes written
to the eightieth character position.
3-6
3.12 CHARACTER OVERWRITE
When an error.is made in entering a character (mis
spelled word), a correction can be made by reposi
tioning the cursor and overwriting the character.
When in either of the conversational transmission
modes, characters will overwrite the display, but will
also be transmitted as additional data.
3.13 AUXILIARY PORT
The AUX Port operates at RS-232C logic levels and
outputs and receives negative-true data. This port is
not affected by the local switch and is always "on
line" to its external device. The operator can talk
to the external device on this port in both Conversa
tional and Block Modes. In Conversational Mode, the
operator can accomplish a character-by-character
transmission out the AUX Port by depressing the
AUX ENABLE alternate action key on the Keyboard.
If a Block Mode transmission is desired, a page send
operation can be initiated by depressing the AUX
SEND key on the keyboard. Data may be transmit
ted at a different baud rate than that of the Main
I/O Port (e.g., the I/O may operate at 9600 baud
while the AUX Port may operate at 1200 baud).
The AUX Port baud rate Is strap selectable internally
in the unit. The AUX Port may be controlled by
utilizing the READY/BUSY line or with an internally
activated time delay.
3.14 MAIN INPUT/OUTPUT PORT
The main I/O Port operates at RS-232C logic levels
and outputs and receives negative-true data. The I/O
Port outputs data to and inputs data from the remote
data source when the terminal is in the On-Line con
dition.
The only requirement for receiving data is that the
terminal be in the On-Line condition. Therefore, if
the terminal is On-Line, any data coming into the
terminal from either the AUX or Main Ports will be
processed. When transmitting data, if the terminal
. is On-Line and a key is depressed on the Keyboard,
the I/O will place circuit CA (request-to-send) in an
"on" condition. If the terminal then receives Clear-
to-Send, it will send the data and drop Request-to-
Send. If no connection is made to the Clear-to-Send
input, the terminal assumes that permission was
granted and the data is transmitted.