I'm not sure what the "tj" is about but here's an explanation of the move:
MOV [SI],DX
This moves the contents of DX
into the memory location whose address is in SI
off of the DS
(data segment) register. So the:
[30030 + 3333]tj[33363] = A3A3
I believe is giving an example but, unfortunately, you're not showing what any of the segment registers are set to, particularly DS
. So my guess is the DS
is 3003
. So the address would be calculated as (DS << 4) + SI
, or 30030 + 3333
. After the "tj" they just added this up to give a final address of 33363
.