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NEC CP/M-86 - Page 114

NEC CP/M-86
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Advanced
BIOS
Functions
6-24
CMD# 1 - Display String Data
on
CRT
This
command,
like
CMD#
0, displays the
data
addressed
by
LA
and
CA
for
the
length
in
NOC
on
the CRT.
The
display
data
must
be
in string
data
format
with
each
item
consisting
of
one
byte
of
normal
character
code
data.
The
contents
of
the
display
request
block
are
the same
for
this
command
as
for
CMD#
0, except
that
CMD
# is
1.
CMD# 2 - Report Cursor Position
This
command
returns
the
current
cursor
position
in fields
LA
and
CA
in the display
request
block.
The
function
uses
only
the display
request
block
fields listed below.
The
contents
of
the
remainder
of
the
area
are
ignored.
CMD#
2
LA
Range is 0-24, binary.
CA
Range is 0-79, binary.
CMD# 3 - Roll Down Screen
This
command
enables
the
programmer
to
roll
down
the
contents
of
video
memory
a
maximum
of
25 lines
on
the screen, as
shown
in
Figure
6-5. The
function
uses
only
the
display
request
block
fields listed below. The
contents
of
the
remainder
of
the
area
are
ignored.
CMD#
3
LA
Number
of
lines
to
roll
down
(1-25,
binary)
VIDLO
MEMORY
DISPLA
YLD SCREEN
29
0 CURSOR
NI:W
Figure 6-5 Roll Down Screen

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