hardware - What happens when you send an 8bit number to an output which is 4bit? C Language -

I am studying in high school, and we have an electronics project.

We have one output from our computer which is 4 bits, the output address is 37Ah and my teacher did this:

  outportb (0x37A , 0x80);  

Then what will appear in the output? 0h or 8h?

Unless it is a 4-bit CPU since the 70s, then your output port will be < Strong> 8 bits, but the connected hardware can only use 4. In that case it is common to use at least 4 bit (but not necessary) so that you have the value of 0x0. But a smoke that uses 0x80, it will be similar to 0x00 and 0xF0. So alone I think that the upper 4 bits are used here, and the sent value is 0x8

but a twisted hardware engineer could use the middle 4 bits.