GSX-86 Device Specific Information
K-16
VT100 WITH DIGITAL ENGINEERING RETRO-GRAPHICS
FILENAME
DDVRET,SYS
DEVICE
INDEX
The actual device index
for
this device
is
determined
in the ASSIGN.SYS,file, which associates a device
index with a
GIOS, module (device driver).
MAXIMUM
BAUD
RATE
9600
baud
for
all graphics
COMMUNICATIONS
Standard
serial communications (RS-232C). The
VT100 uses
XON/XOFF
flagging
to
avoid losing
data
at
high
baud
rates.
GRAPHIC
INPUT
(GIN)
When
GIN
is
invoked
on
the VT100 Retro-Graphics
terminal, a crosshair
cursor
appears
on
the screen.
The crosshair can be moved by pressing one
of
the
four cursor movement keys (up, down, left, right)
on
the
top
row
of
keys
on
the keyboard. When the
cursor
is
at
the desired location, the
point
can
be
selected by pressing any alphanumeric key
(other
than
RETURN).
This ,causes the coordinates
of
the
point
to be
transmitted
back
to
the user
program.
The terminal must be set up so
that
GIN
is
termi-
nated
by
CR
only. This can be done by setting the
two trailer codes in Retro-Graphics set-up
mode
to
OD
hex
and
FF
hex respectively. Refer to the instruc-
tions in the
User Manual
for
Retro-Graphics Model
VT640, "Set Up Procedures," for a further discussion
of
trailer characters.
TEXT
The VT100 has
four
character
sizes.
It
cannot
rotate
text.
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