Installation guide

OS-9 V2.4 on EUROCOM-17 7 Additional Libraries

Software Manual 31

7 Additional Libraries

7.1 The F$System System Call

The F$System system call has been added by ELTEC to provide board-

hardware specific functions to the user.

The functions are available to the members of group 0 only.

To keep the number of new system calls to a minimum, all ELTEC-

specific functions are accessible through the F$System call. A function

code is passed in register d0.w to indicate the operation desired. Specific

parameters and functions of each system operation are discussed in the

following sections. Actual values are resolved by linking with the library

in directory /dd/LIB named libeltec.l for programs written in assembly

language or clibeltec.l for programs written in C.

When the system comes up after booting, the SysTrap module checks if it

runs on the right hardware. It does this by analyzing the SiteCode located

in the init module. For correct functioning this field must contain the

unique board identification code of the CPU board, i.e. $45313700.