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Article Created: 27 May 1993
DISCUSSION Apple Desktop Bus (ADB) ----------------------- Pin Signal name Signal description 1 ADB Data 2 PWRON Power on 3 +5v +5 volts DC 4 GND Signal ground - Connector type: 4-pin minicircular - Total length of all cables not to exceed 5 m (16 ft.) Printer Port ------------ Pin Signal name Signal description 1 HSKo Handshake out 2 HSKi Handshake in/external clock 3 TXD- Transmit data - 4 GND Signal ground 5 RXD- Receive data - 6 TXD+ Transmit data + 7 NC General purpose input* 8 RXD+ Receive data + - Connector type: 8-pin minicircular HDI-30 SCSI Connector --------------------- Pin number Signal name Description 1 nc Reserved for SCSI disk mode. 2 /DB0 Bit 0 of SCSI data bus 3, 8, 10, 12, GND Ground 13, 15, 17, 20, 22, 24 4 /DB1 Bit 1 of SCSI data bus 5 TPWR Termination power 6 /DB2 Bit 2 of SCSI data bus 7 /DB3 Bit 3 of SCSI data bus 9 /ACKS Handshake signal. When low acknowledges a request for data transfer 11 /DB4 Bit 4 of SCSI data bus 14 /DB5 Bit 5 of SCSI data bus 16 /DB6 Bit 6 of SCSI data bus 18 /DB7 Bit 7 of SCSI data bus 19 /DBP SCSI data bus parity bit 21 /REQ Request for a data transfer 23 /BSY When active (low) indicates that the SCSI data bus is busy 25 /ATN When active (low) indicates an attention condition 26 /C/D When active (low) indicates that data is on the SCSI bus. When high, indicates that control signals are on the bus 27 /RST SCSI bus reset 28 /MSG Indicates the message phase 29 /SEL SCSI select 30 /I/O Controls the direction of data output. When high, data is input HDI-20 Floppy Drive Connector ----------------------------- Pin Signal Name Signal Description 1 GND Signal ground 2 GND Signal ground 3 GND Signal ground 4 GND Signal ground 5 NC No connection 6 +5V +5 volts DC 7 +5V +5 volts DC 8 +5V +5 volts DC 9 +5V +5 volts DC 10 NC No connection 11 PH0 Phase 0 12 PH1 Phase 1 13 PH2 Phase 2 14 PH3 Phase 3 15 WREQ/ Write request 16 HDSEL Head select 17 ENBL2/ External drive select 18 RD Read data 19 WD Write data 20 NC No connection Audio Output Connector ---------------------- Pin Signal name Signal description (Sleeve) GND Signal ground (Tip) Left 0.75-volt peak-to-peak audio signal with an impedance of 47 Ohms; left channel (Ring) Right 0.75-volt peak-to-peak audio signal with an impedance of 47 Ohms; right channel Connector type: Stereo miniature phone plug (3.6 mm) Note: The PowerBook 100 outputs a monaural signal on both channels. EXTENDED Information section - Apple Internal Use - Service Providers and Support Professional APPLE EYES ONLY Information section - Apple Need-To-Know Confidential Article Change History: |
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