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These libraries do not have to be always used. And, in as far as standard MS-Windows is pursued,
they do not have to be used at all. The sole exception is that the COM port power must be turned on
via the system library if the user wants to control the COM port directly.
8.3.3 Simulation Driver
As explained above, the libraries for this terminal only control hardware that is compatible with the
IBM PC/AT. This is important to remember if application programs for the terminal are developed
on a personal computer. Although each library is linked to the application program to form an
executable program, they do not contain code that is specific to the hardware of the handy terminal.
Consequently, if a simulation driver is used rather than one of the drivers dependent on the terminal
hardware, the application program can be made to run, without modification, on the personal
computer. This is the basic concept of simulation.
The diagram below shows the simulation environment that has been constructed on the personal
computer. By replacing SysCall.DLL with the simulator, there will not be any part which depends
on the IT-2000 hardware. This allows the simulation program to run on the personal computer
without having no software modification for application program.
Fig. 8.2
For information about SysCall.DLL for simulation refer to Chapter 8.5.1 "System Driver
Simulator (SysCall.DLL)".
SysCall.DLL (Simulator)
LibSYSW.LIB
Application Program
LibOBRW.LIB
PADCTRL.VBX
Std. Mouse Drv.
OBRLIB.DLL
LibYMOD.LIB
YMODEM.DL
Mouse Event
LibSYSW.LIB
MS-Windows
AT Architecture
Std. VGA Drv.
Display Req.
FLINK.DLL Std. COM Drv.
LibYMOD.LIB