Advantech ADAM-5511 Manual page 112

This chapter explains how to program applications and download
programs into the ADAM-5511 system. Additionally, it points out
limitations and issues about which you should be aware.
The operating system of ADAM-5511 is ROM-DOS, an MS-DOS
equivalent system. It allows users to run application programs written
in assembly language as well as high level languages such as C or
C++. However, there are limitations when running application programs
in the ADAM-5511. In order to build successful applications, you
should keep the following limitations and concerns in mind.
The ADAM-5511 provides only two serial communication ports for
connecting peripherals, so the mini BIOS of ADAM-5511 only
provides 10 function calls. Since the user's program cannot use other
BIOS function calls, the ADAM-5511 may not work as intended.
Additionally, certain language compilers such as QBASIC directly call
BIOS functions that are not executable in ADAM-5511. The ADAM-
5511 mini BIOS function calls are listed in the following table.