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RTS: Request to send. An RS-232-C signal used in the exchange of data between
the computer and a serial printer or modem.
S
SD: Send data. An RS-232-C signal used in the exchange of data between the
computer and a printer or modem.
serial: The handling of data bits one after the other.
serial communications: A communications technique that uses as few as two
interconnecting wires to send bits one after another.
serial interface: Refers to a type of information exchange that transmits
information sequentially, one bit at a time. Contrast: Parallel interface.
serial port: A communications port (COM1 or COM2) to which you can connect
devices, such as a modem, mouse, or serial printer.
SIMM: Single In-Line Memory Module. RAM semiconductors used for memory expansion.
SIO: Serial Input/Output. The electronic methodology used in serial data
transmission.
soft key: Key combinations that emulate keys on the IBM keyboard, change some
configuration options, stop program execution, and access the numeric keypad
overlay.
software: The set of programs, procedures and related documentation associated
with a computer system. Specifically refers to computer programs that direct and
control the computer systemÕs activities. See also hardware.
stop bit: One or more bits of a byte that follow the transmitted character or
group codes in asynchronous serial communications.
subpixel: Three elements, one red, one green and blue (RGB), that make up a
pixel on the color LCD. The computer sets subpixels independently, each may emit
a different degree of brightness. See also pixel.
supertwist nematic (STN) display: A thin-screen, passive matrix color LCD that
meets VGA standards with reproduction of 256 colors.
synchronous: Having a constant time interval between successive bits,
characters or events.
system disk: A disk that has been formatted with an operating system. For
MS-DOS the operating system is contained in two hidden files and the COMMAND.COM
file. You can boot a computer using a system disk. Also called an operating
system disk.
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