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The described technique permits a service representative or user to personalize word processing machines to meet particular application requirements.
English (United States)
This text was extracted from a PDF file.
This is the abbreviated version, containing approximately
66% of the total text.
Page 1 of 1
CMOS Application Personalization
The described technique permits a service representative or user to
personalize word processing machines to meet particular application
Using CMOS random-access memory provides a means of giving a hardware
invariant invariant machine user required options. In the past, this has been
accomplished by a set of service-representative-settable bit switches within the
machine. When the number of variables exceeds about 20, the cost of this
method becomes prohibitive. In SNA (System Network Architecture)
communications alone, there is now a need for at least 40 settable variables.
CMOS was chosen because of its extremely low power requirements in the
standby mode. This power requirement is so low (less than 5 mu amp for 1024
bits) that it is feasible to maintain the memory contents by means of a small, low-
cost battery. This battery 'keep alive' feature effectively provides nonvolatility for
the CMOS memory. Ability to retain machine personality with the machine A/C
power off is required for service-representative-installable options; it is also
required in almost all cases for user options.
Initial bit values can be loaded into the random-access memory dynamically
via microcode or directly from bit switches. One of the key features of this idea
is the ability through software to load or change any or all the variables (bits)
from the keyboard either by the service representative or by the user. Variables
can be grouped in...