Sub Fastcall behaviour

[na_th_an]

I understand that if, for example, you pass an uByte parameter, it's put into the A register... But it seems that the parameter itself is not usable from BASIC. I don't know if this is intended, there's nothing about this in the doc.

Code:

Sub Fastcall test (n as uByte)
    Asm
        ld (40000),a
    End Asm
    Print n
        Print Peek (40000)
End Sub

test (16)

I expected this code to print 16 twice, but it outputs:

Code:

0
16

This is, the value of "n" is 0. In other scenarios, I get other values, not just 0.