ISA as a Diagnostic Platform
The D201 is an ISA-to-PC/104 bus adapter. It is intended mainly for lab use. ISA-compatible PCs support a test and diagnostic platform for software development.
The D201 is designed to be used together with the -P4C "carrier mounting option" of duagon boards D114L and D113.

PC/104 Stackthrough Option
Optionally, the D201 may be used with PC/104 modules with stackthrough pins. In this case, a -P4A or -P4B version of the D114L/D113 is mounted on the opposite side.
Since this is completely optional to the placement of the P4C board, the D201 may carry two boards in total. Please note that this arrangement requires an additional connector bezel and matching cables. Even though there are additional boards possible from the mechanical point of view, duagon recommends to assemble no more than two PC/104 boards on the D201, since the maximum power supply current on one single connector pin may be exceeded.