Sharp PC-1500A Instruction Manual page 93

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F.5. GPRINT
The GPRINT statemont pr-ovidcs d irect. programmable c<>ntrol over the dots of the d isplay
window. Since the GPRINT statement sets and resets dots within any 7-0ot column. it is normally
used in conjunction with the GCUASOR instruction . The GCURSOA statement selects the
appropriate column for modi fication and the GPR INT statement man ipulates the dots \vithin
that column. The GPRINT statement is also capable of printing several contiguous columns of
information in a single statement.
In order to understand the format o f the GPRINT statement. it is necessary to understand
ho .. v the dots within a column are controlled. The pattern of energizr.d dots \.Vithin a column
may be specified ei ther as a decimal number or as a hexadacimal character string, If the deci mal
system is used. then each rovr-.• may be visualized as being numbe red. from the top down , by a
po .. ver of t .. vo. This is illustrated below:
2 - - - - - - - -
4 - - - - - - - -
8 - - - - - - - -
16 - - - - - - - -
32 - - - - - - - -
64 --- -----
With 7 dots to a column. each of which may either be on or off. there arc 128 possi blc dot
patterns. Thus. to specify a particular pattern one uses the format:
GPRINT pattern-expression ; J>attern ·cxprcssion2 . . (etc) . .
where:
pattern-expression evaluates to
a
number in the range
0 to 127
and specifics the pattern of
energized dots. Several pattern expressions may optionally
be
specified and must
be separated by either a sem icolon or a comn1a. If a comma is used, a blank column
will be left between every printed column.
Let us illustrate the utility of the GPRINT instruction by creating
a
new character: an Up
Arrov\f. First,
vie
design our character on a grid representing the ro\VS
and
columns:
Caution
1
- - - - * - - - -
2
- -*-*-* - -
4 · - - - · - - - · 8 ____ ., ___ _
16 - - - - .. - - - -
32 - - - - "' - - - -
64 _ _ _ _ ,,. __ _ _
2 3 4 5
Observe the following w hen correcting the PRINT command in a program for a GPR INT
command:
Example: r Rewite " PR INT" entirely into "GPRINT" .
20
PRINT
AS
L nserting only "G" does not allow the com puter to judge it as "GPRINT".
(This is regarded as "G" and "PRINT".)
l
The same can apply when the CURSOR command is corrected to a GCURSOR command, o : J
to the printer commands.
w..~~~~~~~~~~~~~· v
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