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   ocr: Macintosh Keyboard Connector (RJ-11 Telephone-style jack) Pin Name Descnption/Notes 1 Ground 2 KBD1 Keyboard clock 3 KBD2 Keyboard data 4 +5Y See aute Maaehfor power limits Macintosh Erternal Drive Connector (DB-19) Pin Name Descnption/Notes 1 Ground 2 Ground 3 Ground 4 Ground 5 -12Y See aute Maaehfor power limits - +5V See aute Arueifor power limits 7 +12Y See aute ARTIRZGIOT power limits - +12Y See aute ARTIRZGIOT power limits 10 PWM Regulates speed of the drive 11 PHO Control line to send commands to the drive 12 PH1 Control line to send commands to the drive 13 PH2 Control line to send com ...