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Apple Personal LaserWriter 300
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=== RS-422 Serial Communication Faults === The Personal LaserWriter 300's 57.6 kbps serial connection has specific failure points: '''Mini-DIN-8 Pinout (M2001 Specific):''' * Pin 1: HSK Out (Hardware handshake) * Pin 2: HSK In (Required for 300) * Pin 3: TxD- (Transmit data minus) * Pin 4: Ground * Pin 5: RxD- (Receive data minus) * Pin 6: TxD+ (Transmit data plus) * Pin 7: Not connected (unlike 320) * Pin 8: RxD+ (Receive data plus) '''Common Serial Failures:''' * '''No communication:''' Check pins 3,6 (TxD) and 5,8 (RxD) * '''Prints garbage:''' Verify 57.6 kbps setting in driver * '''Stops mid-page:''' Hardware handshake failure (pins 1,2) * '''Random characters:''' Cable exceeds 25 feet limit
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