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Serial Port

One serial port is available to connect external devices to the

QX-10. The port is a standard RS-232C port; however, it can be

changed under software control, by selecting the serial port op-

tion from the SETUP program in either CP/M or Valdocs. Devices

such as serial printers, single-line modems, additional monitors,

and other computers can be connected to the available serial port.

Centronics

-compatible Parallel Port

The parallel port is a standard Centronics-compatible port where

more external devices can be connected (such as parallel printers

or plotters). While a serial port allows data through a single port

cable one bit at a time (serially), in a parallel port data goes out

through eight different wires simultaneously (in parallel). Parallel

ports move an entire byte of data at a time, much faster than a

serial port.

Another special feature of the QX-10 is its CMOS RAM memory.

The CMOS (for complementary metal oxide semiconductor)

memory contains 2K (2048) bytes and uses very little power. The

internal nickel-cadmium battery that powers the CMOS RAM

automatically recharges when power is ON. This allows the CMOS

RAM to retain the 2K of memory even when the computer is

turned OFF or unplugged-a welcome feature. The CMOS RAM

functions for several weeks with the power OFF.

Your QX-10 contains a clock calendar that also uses the CMOS

technology. Instructions for setting the clock calendar are given

in your Valdocs User's Guide. Once you set the time and date, your

QX-10 maintains both accurately.