1-6
Chapter 1. System Kernel
1. System Kernel This chapter is used to introduce the system kernel of MR350MKII. Where the
system kernel is divided into six subsystems to service application programming
interface, keyboard input, LCD display, communication I/O, Real Time Clock, Relay
output/Digital input and Barcode wand/Magnetic stripe/Proximity reader.
1.1. Application Programming Interface
The MR350MKII kernel includes three basic modules: device driver, file
manager and DOS manager. The programmer can design the application
programs by calling those available functions just like that in the PC DOS
environment.
The ROM based operating system of the terminal provides emulated
MS/DOS function calls. The calling and parameter passing conventions are
identical to that of MS/DOS. The detailed description of supported
functions of the Terminal's subsystems, I/O interface, DOS manager and File
manager is defined in later chapters.
The software to be run on MR350MKII may be programmed by using
Microsoft C 5.1 and later version, and the IBM PC macro assembler version
1.0 and later version. Transaction data can be processed interactively with
the computer or stored in a file.
NOTE in using Microsoft C:
When program execution area assigned less than 64K (see section 4.3) and
a program with size more than 64K is invoked to run. A run time error
message, "Not enough space for environment", will be shown. In this case
add following statement in main:
/* mypgm.c */
_setenvp()
{
}
main()
{...
...
...
}
and link with: >LINK /NOE mypgm