Ram Drive; Extended Memory; Expanded Memory - Intermec JANUS 2020 User Manual

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Reader Specifications

RAM Drive

Part of extended memory is configured as a RAM drive (drive E) on the 4MB
JANUS device. The default CONFIG.SYS file loads HIMEM.SYS and uses the
SRAMDISK.SYS device driver to create the RAM drive.
You can use the RAM drive to store files just like a disk drive on your PC. File
access is usually faster on a RAM drive than a physical disk drive. Unlike a PC,
the JANUS device saves any files on the RAM drive during a warm boot.
However, the JANUS device clears any files on the RAM drive on a cold boot.
The RAM drive uses 256K of extended memory. If you are not using a PC card,
Intermec recommends that you use the RAM drive for data files that you save
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or update frequently. The RAM drive is not as secure as a PC card since the
drive is erased when you cold boot the JANUS device (unless you press
during memory test).

Extended Memory

The JANUS device is initially configured with 2.75MB of extended memory
available, which is allocated for use by Intermec applications (IC.EXE and IRL).
To remove the RAM drive and use the available extended memory, you need
to change or delete the SRAMDISK statement in the CONFIG.SYS file. You can
also use extended memory for overlay memory.
The JANUS device provides extended memory for control and access to RAM
above 1MB. The extended memory conforms to XMS specification 2.0. The
HIMEM.SYS driver initializes and manages extended memory. HIMEM.SYS
looks at all the memory in the system and takes control of everything above
1024K. You must load all drivers in extended memory through the
HIMEM.SYS interface. If a driver is not compatible with HIMEM.SYS, you
cannot load it in high memory.
Some applications may require you to exclude memory from HIMEM.SYS
management, leaving some extended memory available. If this is necessary,
you should reconfigure the RAM drive (E) to use the available extended
memory. DOS drivers must check in with HIMEM.SYS for their memory
assignments within the XMS managed by HIMEM.SYS. Currently, the RAM
drive uses the XMS interface through HIMEM.SYS.

Expanded Memory

When you install more than 1MB of memory on a PC, it can be used as
expanded memory and is a way for the system to access memory beyond the
1MB barrier. To use expanded memory on a PC, you need an expanded
memory board and an expanded memory manager.
Expanded memory is not available on 4MB JANUS devices.
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