Apple IIgs - Manual (Page 71)

Page 71 of 84 II gs
Printed: Thursday, July 25, 2002 12:14:50 PM
drive number: An application might ask you to distinguish between disk drives by number. Drive
1 is the drive of its type connected closest to the computer or to the connector labeled Drive
1 on a disk drive controller card. Drive 2 is the drive of its type connected to drive 1 or to
the connector labeled Drive 2 on a disk drive controller card.
drive 1: The disk drive where you put the application program disk you want to start up.
drive 2: See drive number.
DSR: Stands for Data Set Ready. A handshake signal used to regulate the flow of data between
the computer and a peripheral device.
DTR: Stands for Data Terminal Ready. A handshake signal used to regulate the flow of data
between the computer and a peripheral device.
duplex: See full-duplex modem and half-duplex modem.
Dvorak keyboard: A keyboard layout designed to increase typing speed and efficiency by locating
the keys used most often in the home row. Also called the American Simplified Keyboard.
echo: A copy on your own screen of a message you send via a modem. The echo can come from the
remote computer (the computer on the other end of the phone line) or from your own computer.
Edit menu: A menu in most mouse-based programs that lists editing commands like Copy, Cut, and
Paste.
educational software: Software that teaches something. Also called courseware. See also
computer-aided instruction.
8-bit processor: A processor that can address 65,536 memory locations directly.
80-column card: An interface card that made it possible for earlier models of the Apple II to
display text in 80-column form instead of the standard 40-column form.
80-column display: The number of characters per line that are displayed on the screen. The
options are 40 and 80 columns.
eject: To remove a disk from a disk drive.
electronic mail: Abbreviated E-mail. A message sent from one computer with a modem to another
computer with a modem over phone lines.
E-mail: See electronic mail.
Enter: A key on the numeric keypad that usually has the same function as Return; that is, it
confirms a choice or tells a program you're ready to proceed.
error message: The computer's way of alerting you to a failure in the communication process;
often accompanied by a beep.
Esc: A key you can press (in some applications) to get back to the menu or to cancel a
procedure that's in progress.
even parity: An error-checking system in which the sending device adds an extra bit set to 0 or
1 as necessary to make all the 1 bits add up to an even number. The receiving device adds the 1
bits and if the total is an even number, it assumes the message came through intact.