With this, all system calls that are used to setup and handle the com port are replaced by custom ones. It basically has a dll with system calls that replace the normal calls. The windows launcher of which I have source code uses a technique called "dll injection" to launch a Taito game. The idea is probably to have the option to reset the pc motherboard or power it up with the microcontroller. If I remember well, there is also a connection to the "case pins" Those have the "power on" and reset pins. Taito hardware uses a plugin JVS adapter with it's own microcontroller that connects to the pc motherboard using the connectors that are normally used to connect the DB9 serial connector on a bracket.
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