Juniper Systems Allegro DOS Manual - Manual (Page 51)

Allegro DOS Owner’s Manual 51
Internal Memory
The Allegro’s internal memory is confi gured much like the memory
in laptop computers. It consists of ROM (Read Only Memory) and
RAM (Random Access Memory).
Read Only Memory (ROM)
ROM is used to store the Operating Systems, BIOS, and Utility
programs. The fi les on the A: drive of the Allegro are located in the
ROM. Information in the ROM is electronically “burned” into a chip
before the chip is installed at the factory. Information stored in ROM
can be read or copied. It can only be altered with a special utility
program provided by the factory. The information stored in ROM
remains intact whether the system power is on or off.
Random Access Memory (RAM)
The Allegro has 16 M (megabytes) of internal RAM. Often referred to
as the computer’s workspace, RAM is where programs are executed
or run. RAM can be written to, read from, erased, etc. Its storage
ability is temporary in nature, only holding information while the
system has power (although the Allegro does not have to be turned
on).
If the battery pack is drained or power is interrupted for any reason,
everything stored in RAM is lost. The backup capacitor saves the
contents of RAM for a limited time while you change the battery
pack (see Chapter 2, Batteries, for details).
All but a small portion of the 16 M of RAM is available.
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