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JANUS? 2020 Hand-Held Computer (4MB) - Intermec

JANUS? 2020 Hand-Held Computer (4MB) - Intermec

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<strong>JANUS</strong> <strong>2020</strong> <strong>Hand</strong>-<strong>Held</strong> <strong>Computer</strong> User’s Manual (<strong>4MB</strong>)<br />

G-12<br />

extended memory<br />

System memory above <strong>4MB</strong>. The reader is initially configured with 3MB of<br />

extended memory available, which is allocated for use by <strong>Intermec</strong> applications<br />

(IC.EXE and IRL). The reader provides extended memory for control and<br />

access to RAM above <strong>4MB</strong>. The extended memory conforms to XMS<br />

specification 2.0. Extended memory is initialized and managed by the<br />

HIMEM.SYS driver.<br />

extended memory manager<br />

Software that makes extended memory available to DOS programs. For<br />

example, you must run an extended memory manager such as HIMEM.SYS on<br />

the reader to create and use a physical RAM drive.<br />

FIFO control register (FCR)<br />

First in/first out control register. The FCR contains a hex value that controls<br />

how the UART buffer operates. You may need to configure the <strong>JANUS</strong> to<br />

restore a hex value for the FCR in case you turn off the reader while running a<br />

communications application that uses UART 16x550 mode.<br />

fixed length<br />

Characteristic of a bar code symbology in which the number of characters per<br />

symbol is predetermined. Opposite of variable length.<br />

flash PC card<br />

A type of memory PC card that provides additional disk storage space, not<br />

more executable conventional memory, on the reader. Flash cards retain their<br />

data without the use of a backup battery.<br />

flash ROM drive<br />

Drives C and D on the reader are ROM drives that are implemented in flash<br />

memory. Flash ROM drives are upgradeable, but have limited write capability.<br />

Both drives use a file allocation table (FAT) type format.<br />

flow control<br />

A method for controlling the flow of data between the reader and the serial<br />

port. It stops the transmitting device from sending data when the receiving<br />

device buffer fills up and starts it again when the buffer empties. Flow control<br />

can be done through software (XON/XOFF) or hardware (CTS/RTS).<br />

full ASCII<br />

An operating mode that sets the reader to properly decode Code 39 or Code 93<br />

labels containing data that includes any of the 128 ASCII characters.

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