Ring

These are the files you need. You can send them from the package contents below.

• RING.COM → A:\SOFT programa de DOS 988 B

No need to put RING.DOC: they are manuals, source code or supporting material. Read them here and save 4.6 KB on a 1 MB disk.

1. Copy RING.COM to A:\SOFT. They are DOS programs: run them from the DOS icon, or add A:\SOFT to the PATH in C:\AUTOEXEC.BAT to call them by name.

Derived from the package contents and the 200LX conventions. It installs to A: on purpose: C: is a RAM disk and every byte there is memory taken from the system.

The setup is: 9600 baud, 8 data bits, no parity, 1 stop bit.

In DEBUG mode, any detected EMI (electomagnetic interference)
causes a click to make it audible. In addition, an error
counter is incremented and the numer of occurred errors of
the last second is displayed in the upper half of the screen,
if there were any. The display stops, if no errors are detected.

On the first line of the screen you will see the mean value
per second of these errors. This value is important in order
to find out, if a shielding of the palmtop has any effect.

Additionally, on the first line you will also find the absolute
number of framing and overrun errors of this run. These are
only of statistical significance.

In the lower half of the screen are the incoming characters
displayed, as received by the UART.

Any key you press is send out to the IR port and immediately
received by the photo diode and hence echoed on the lower half
of the screen. Use this feature to test, if a manipulation of
the IR hardware had a negative effect on the IR receiver, which
would result in no echo or a falsified echo.

Indeed every echo also increments the error counter, because
the software cannot now, if the character came in through the
IR port or if it was induced by EMI.

If you want to know, if a hardware manipulation of the palmtop
had success in suppressing EMI but still allowing IR communi-
cation, you should see no data coming in if a mobile phone is
online, but any key you press on the palmtop should be echoed.

During a test run, you may always press the space bar to reset
all counters and start a new measuring.

Pressing the Enter key brings you back to the 'ring' mode.
Press ESC to quit the program.

NOTE: Light sleep is disabled in DEBUG mode. Always quit the
…

Literal excerpt from RING.DOC, exactly as it came in the package.