Radio Shack Telephone Interface II Operation Manual

Computer Graphics
Operation Manual
-----------TRS-BO ® ----------
PRESET
Sets Pixel OFF (or ON)
PRESET sets a pixel either OFF (~) or ON (1), depending on
switch. If switch is not specified, ~ (OFF) is used.
Values for (~) that are larger than the parameters of
the screen (i.e., greater than 639 for ~ and 239 for y)
are accepted, but these points are off the screen and
therefore are not PRESET.
Note: The only choice for switch is ~ or 1. If you enter
any other number, an Illegal Function Call error will
result.
Examples
l~ PRESET (5~,5~),1
2~ PRESET (5~,5~),~
Turns ON the pixel located at the specified coordinates (in
line l~) and turns the pixel OFF (in line 2~).
l~ PRESET (32~,12~),1
2~ PRESET (3~~,1~~),1
3~ PRESET (34~,14~),1
4~ FOR 1=1 TO l~~~: NEXT I
5~ PRESET (32~,12~)
6~ PRESET (3~~,1~~)
7~ PRESET (34~,14~)
8~ FOR 1=1 TO l~~~: NEXT I
---------ltadI8Ihaell---------
-42-

Radio Shack Telephone Interface II Specifications

General

Brand	Radio Shack
Model	Telephone Interface II
Category	Desktop
Language	English