Symbol WSS 1000, Product Reference Manual

Page: 42 / 133

4-1
Chapter 4
Spectrum24
®
RF Terminal Setup
Spectrum24 Terminals
In Spectrum24 terminals, wireless connectivity is accomplished using standard
communications protocols. Because they are standard, the protocols are generalized and take
up considerably more space on the wrist computer’s NVM than was required for Spectrum
One
®
wrist computers. Because there is less space available in NVM for application files, the
WWC 1040 operates with an additional megabyte of non-volatile memory or flash disk. This
extra memory reduces not only the boot times but also the time and resources required to
load applications into the wrist computer. The flash disk also offers the possibility of running
multiple applications from the same WWC 1040 (see
Multiple Applications on the Same
Wrist Computer on page 4-15 for more information). With version 3.03 or later of the system
software (LWP.HEX), the WWC 1040 can also run diagnostic tools.
Accessing the Flash Disk
The flash disk is accessed through a driver, FLASHDSK.SYS, which makes the flash disk
appear to a program as another disk drive (E:). The drive has characteristics of fast reading
but slow writing (e.g., even for the smallest files, the write process takes 3 to 4 seconds),
which make it ideal for files that are written once, accessed often, and seldom updated.
We recommend that you use the flash disk (E:) mainly for application and configuration file
storage. It is important to note that because of the slow writing time (3 to 4 seconds), writing
files during a power interruption (low battery, dead battery, suspend, power off, or power
failure) could corrupt the disk. Be sure to only write data to the disk with the wrist computer
connected to external power or with the battery fully charged to avoid problems. To avoid
overwriting the flash disk by mistake, the flash disk is set to read-only mode for normal
operation.