Casio IT-2000W - Manual (Page 13)

13
1.3 Precautions

If reading the internal clock with INT21h the significant data should include and be limited to
the seconds digits. On this terminal the time is read directly from the RTC so that the correct
time can be attained at any moment, even during extended continuous use. As a result the 1/100
of a second digit is ignored. (refer to Chapter 7.3 “Clock Control Driver”.)

To count time, the counter of DOS or the function provided for reading time must be used.
Time tick count of Windows will be behind 1 second in every 2 minutes.

If it is necessary to reboot the system from an application, use the dedicated system library.
However, the reboot operation that uses INT19h of the BIOS I/F does not work.

Many commercial PC programs use a VGA screen (80 (H) x 25 (V)). If these programs are run
on this terminal (24 (H) x 24 (V)) part of the message may not be displayed on the screen.
For example, some of messages displayed by Windows appear partly (left side of the messages
only) on the screen.

Writing to a PC card should always be performed by terminating the write action through the
flash-out process. Otherwise, if system operation is suspended while writing to an SRAM card
or ATA card, the data on the card may be damaged. To activate this flash-out process use the
“_dos_commit()” function of Visual C/C++ or Commit Function (68h) of DOS.

VGA controller is installed in IT-2000. Logically, it can display 16 different colors each in
single color though only 4 colors at a time are distinguishable. In case of development of
application program in single color, by having four colors, such as RGB (255,255,255), RGB
(192,192,192), RGB (128,128,128), RGB (0,0,0), will help you create an easy-to-see
application program.
Note:
If you wish to select a dither color, first display it on the screen to make sure. Due to technical
reasons the display of the B/W LCD may change to reverse video if an application program
developed by the user on a PC is executed without modification on this terminal. To restore the
normal display use the Reverse Video Utility (refer to Chapter 9.8 “Reverse Video Utility”).

Key input operation is disabled for about one second after the Power has been turned off/on.
This is not a malfunction. This occurs because the monitoring timer starts operating the moment
the Power switch is turned on and does not allow any key input for about one second until this
timer expires. Thus, key input is not possible.