Telxon PTC-921 DOS, User Manual

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Beeper
The PTC’s beeper is used by the PTC and your
application to warn you of problems or to prompt you
to take an action. For example, if your application
program has temporarily turned off a key, the PTC
will beep if you press that key.
Clock
The PTC’s clock can be set using the
MS-DOS TIME and DATE commands. The PTC-921 DOS has a built-in clock that keeps
track of the date (month, day, year, and day of the
week) and the time (hours, minutes, seconds, and
tenths of seconds). The clock operates continuously.
How the clock is used depends on your application
program. For example, the PTC can use the clock to
show the date and time on its screen or to time-stamp
a file.
Communication
The PTC-921 DOS is capable of communicating with
a host computer via its internal radio or through an
optional communication cradle. See the manual or
instructions provided by your organization for the
proper communication procedure for your application.
Memory
The PTC-921 DOS has two types of memory: read-only
memory (ROM) and random access memory (RAM).
Refer to the manual shipped with
the cradle for flashing instructions.
The PTC’s ROM is contained on an electronic chip
called a
flash EPROM , which can be reprogrammed
while inside the PTC (via an optional communication
cradle). It is used to store the PTC’s operating system
and application program.
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