Intermec Janus 2020 User Manual page 534

JANUS 2020 Hand-Held Computer User's Manual
extended memory
System memory above 1MB. The reader is initially configured with 64K of
extended memory available, which is allocated for use by Intermec applications
(IC.EXE and IRL). The reader provides extended memory for control and
access to RAM above 1MB. The extended memory conforms to XMS
specification 2.0. Extended memory is initialized and managed by the
HIMEM.SYS driver.
extended memory manager
Software that makes extended memory available to DOS programs. For
example, you must run an extended memory manager such as HIMEM.SYS on
the reader to create and use a physical RAM drive.
FIFO control register (FCR)
First in/first out control register. The FCR contains a hex value that controls
how the UART buffer operates. You may need to configure the JANUS to
restore a hex value for the FCR in case you turn off the reader while running a
communications application that uses UART 16x550 mode.
fixed length
Characteristic of a bar code symbology in which the number of characters per
symbol is predetermined. Opposite of variable length.
flash PC card
A type of memory PC card that provides additional disk storage space, not
more executable conventional memory, on the reader. Flash cards retain their
data without the use of a backup battery.
flash ROM drive
Drives C and D on the reader are ROM drives that are implemented in flash
memory. Drive C is upgradeable, but has limited write capability. Drive D
cannot be modified. Both drives use a file allocation table (FAT) type format.
flow control
A method for controlling the flow of data between the reader and the serial
port. It stops the transmitting device from sending data when the receiving
device buffer fills up and starts it again when the buffer empties. Flow control
can be done through software (XON/XOFF) or hardware (CTS/RTS).
full ASCII
An operating mode that sets the reader to properly decode Code 39 or Code 93
labels containing data that includes any of the 128 ASCII characters.
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