USING_EXTERNAL_CLOCK       EQU $01
USING_INTERNAL_CLOCK       EQU $02
CONNECTION_NOT_ESTABLISHED EQU $ff

START_TRANSFER_EXTERNAL_CLOCK EQU $80
START_TRANSFER_INTERNAL_CLOCK EQU $81

; signals the start of an array of bytes transferred over the link cable
SERIAL_PREAMBLE_BYTE EQU $fd

; this byte is used when there is no data to send
SERIAL_NO_DATA_BYTE EQU $fe

; signals the end of one part of a patch list (there are two parts) for player/enemy party data
SERIAL_PATCH_LIST_PART_TERMINATOR EQU $ff