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The GameBoy could be connected connected to another GameBoy via a cable, whilst the Color (presumably inspired by TV remotes) used an LED & light sensor. 9Front's emulator uses a socket to represent this.
The initializer for which registers a timer sends & receives some data (order depends on whether we're operating as the socket's server), re-enqueues this timer, exits if its a sync packet, the "leader"/server sets a flag, exposes the input to I/O register SB (hex-1), ...
1/3?
... clears the most significant bit of SC (hex-2), sets or clears the least significant bit of SC, & sets the most significant bit of IF (hex-F).
Next the initializer either opens a socket & waits for a peer to connect on it, or connects to said socket. If successful it initializes the channels & runs 2 threads for reformatting the timer's data over the socket.
1.5/1.5 Fin for today! I'll finish discussing 9Front's GameBoy emulator tomorrow!
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