How do I integrate the link cable into my projects?

[Ahchay]

Okay, so I'm getting into this and I can work out which bits are calling something and which bits are program flow, but I'm not clear on how to check the return values?

For instance - if we look at this bit

Code:

ldb  rw3, VECT_COMCREATEDATA
ldb  rb3,                123
calr             SYSTEM_CALL
cpb  ra3,         COM_BUF_OK
jr    ne,              Again

Right, so we load VECT_COMCREATEDATA(0x13) and the test value 123 into the registers and then call the system_call. We then compare ra3 to COM_BUF_OK and JUMP if NOT EQUAL to the Again label (so,it's a loop)

So, I'm doing that like that 

Code:

    if(wWaitTime1==0)
    {
        u8 again;
        again=0;
    /* Create buffer of four 123 bytes for sending */
        while(again<4)
        {
        // VECT_COMCREATEDATE=0x13
        __asm("ldb  rw3, 0x13");
        __asm("ldb  rb3, 123");
        __asm("calr SYSTEM_CALL");
                __asm("ldb l,ra3"); // Should push the ra3 value to the stack?
        PrintDecimal(SCR_FORE_PLANE,0,0,5,ra3,2);

        if(ra3==COM_BUF_OK)
        {
            again++;
        }
        NegotiateTimeout++;
        PrintDecimal(SCR_FORE_PLANE,0,0,6,NegotiateTimeout,5);
        if(NegotiateTimeout>=1024) again=4;
        }

    }

Edit: So, this is as far I've got - which isn't very far


So far so good, but how do I get the retval from the system call?

Apologies for the stupid questions - I can follow ASM easily enough, but I've only used inline ASM from within C for pretty basic things before