Forget the PC-Engine LT, apparently there is the PC-Engine Duo Monitor! Yep, you read that right!
NEC engineers weren’t just sitting around high-fiving each other once they released the LT version, oh no, they wanted to create something similar for the dual CD/HuCard console – enter the PC Engine Duo Monitor!
These monitors are so rare, you will have a very hard time finding one and when you do, you will have to negotiate on selling a limb (or two) and a kidney – yes, these things are very very expensive!
source: eBay