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

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NF BC Learning About the Software<br />

3<br />

Input Manager Using software interrupts and library functions, your reader<br />

applications can use Input Manager as an interface for all data I/O from the<br />

reader’s COM ports, wand, scanner, and keypad. Input Manager also handles<br />

all power management during data I/O. For help with software interrupts and<br />

library functions, see your <strong>JANUS</strong> PSK reference manual.<br />

You can use Input Manager to customize how the reader handles data from the<br />

keypad, wand, or scanner. The reader can display all input, beep when labels<br />

are scanned, and parse reader commands. For example, when you scan a bar<br />

code label, Input Manager can identify the symbology and if the label includes<br />

reader commands.<br />

Virtual Wedge The Virtual Wedge decodes and manages bar code input,<br />

making the reader functionally equivalent to a wedge reader connected to a<br />

PC. This program facilitates rapid porting of PC applications to the reader.<br />

When you scan a bar code label, the Virtual Wedge inserts the data into the<br />

keyboard buffer as if it had been typed. The Virtual Wedge sends configuration<br />

commands to Configuration Manager. The Virtual Wedge also recognizes and<br />

implements reader commands.<br />

Direct Hardware Wedge The Direct Hardware Wedge is a new feature of<br />

<strong>JANUS</strong> 4.0 software that allows bar code data to emulate keystrokes on the<br />

keypad. For more information on the Virtual Wedge and Direct Hardware<br />

Wedge, see “Understanding the Bar Code Wedge,” later in this chaper.<br />

Making More Memory Available on the Reader<br />

Your <strong>JANUS</strong> reader may not have enough conventional memory available for<br />

the applications you want to run. If so, you may be able to free some<br />

conventional memory by performing these tasks:<br />

• Not installing the PC card drivers to free about 60K of memory<br />

• Unloading the Reader Wedge TSR to free about 80K of memory<br />

Not Installing the PC Card Drivers<br />

You do not need to install PC card drivers if you<br />

are not using PC cards in your reader. You may<br />

be able to save up to 60K in conventional<br />

memory by not installing the drivers. Choose the<br />

No PC Card option on the MS-DOS startup<br />

menu and PC card drivers will not be installed<br />

when you boot the reader.<br />

MS-DOS 6.2 Startup<br />

1. SRAM PCCard<br />

2. ATA PCCard<br />

3. Flash PCCard<br />

4. I/O PCCard<br />

5. No PCCard<br />

Enter a choice:<br />

F5=Bypass startup<br />

file<br />

20X0A.002<br />

3-39

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