How do I integrate the link cable into my projects?

[Ahchay]

Okay, think I've got the first bit working now - not sure whether this is the neatest way to do it, but it appears to work as expected - or at least, it doesn't not work...

Code:

u8 Link_CreateTestByte()
{
    // VECT_COMCREATEDATA=0x13
    __asm("ldb  rw3, 0x13");
    __asm("ldb  rb3, 123");
    SystemCall();

    // The "return value" of the system call will be
    // in register ra3
    // Move into the XHL register
    __asm("ldb l,ra3"); // Loads ra3 into the hl lower byte
    __asm("ldb h,0"); // Clears the upper byte
    return;
}