TOPIC
This article presents the pinouts for Power Macintosh 9500 series computers. These pinouts include: ADB, GeoPort, SCSI, a floppy disk drive, built-in Ethernet, high-quality 16-bit stereo sound, and various levels of monitor support depending on the model.
DISCUSSION Apple Desktop Bus (ADB) ------------------------ One connector is located on the back panel of Power Macintosh computers. It is a 4-pin mini-DIN socket. Pin Description --- ----------- 1 Data; grounded by an open collector or pulled to +5 V through 470 2 Power on, fed by +5 V through 100 k; connect to pin 4 to turn on the system 3 +5 V at 500 mA maximum drain; protected by a 1.25-A circuit breaker 4 Ground return Ethernet -------- All models of Power Macintosh contain built-in Ethernet. The 9500's offer two types of connection. One AAUI-15 Ethernet connector Pin Description Pin Description --- ----------- --- ----------- 1 +5 V 8 +5 V 2 DI+ 9 DO+ 3 DI- 10 DO- 4 Ground 11 Ground 5 CI+ 12 No Connection 6 CI- 13 No Connection 7 +5 V 14 +5 V And One 10Base-T Ethernet connector (NOTE: If both 10BASE-T and AAUI connectors are plugged in, the computer uses the 10BASE-T connector by default.) The pin configurations for 10BASE-T are as follows: RJ-45 Connector ----------------------------- | 1 2 3 4 5 6 7 8 | | ----------------------- | | |\\ \\ \\ \\ \\ \\ \\ \\| | | | | | | | | | | | | | | ----- ----- | | | | | | --- --- | | | | | | ------ | ------------------------------- Contact: Signal: 1 TD+ 2 TD- 3 RD+ 4 Not Used by 10BASE-T 5 Not Used by 10BASE-T 6 RD- 7 Not Used by 10BASE-T 8 Not Used by 10BASE-T Serial Ports ------------ The back panel of all Power Macintosh models contain two I/O ports for serial telecommunication data. Both sockets accept 9-pin plugs allowing either port to be independently programmed for asynchronous or synchronous communication formats up to 9600 bps. This includes AppleTalk and the full range of Apple GeoPort protocols. Pin Name Function --- ---- -------- 1 SCLK(out) Reset pod or get pod attention 2 Sync(in)/SCLK(in) Serial clock from pod (up to 920 Kbit/sec.) 3 TxD- Transmit - 4 Gnd/shield Ground 5 RxD- Receive - 6 TxD+ Transmit + 7 Wakeup/TxHS Wake up CPU or do DMA handshake 8 RxD+ Receive + 9 +5 V Power to pod (350 mA maximum) SCSI Connection --------------- The SCSI interface in Power Macintosh computers exists in two forms: an internal 50-pin ribbon connector for internal devices and an external DB-25 connector for external devices. Pin Number Description Pin Number Description ------------------- ----------- ------------------- ----------- Internal External Internal External 1 7 Ground 2 8 /DATA0* 3 9 Ground 4 21 /DATA1 5 14 Ground 6 22 /DATA2 7 16 Ground 8 10 /DATA3 9 18 Ground 10 23 /DATA4 11 24 Ground 12 11 /DATA5 13 Ground 14 12 /DATA6 15 Ground 16 13 /DATA7 17 Ground 18 20 /DATAP 19 Ground 20 No connection 21 Ground 22 No connection 23 Ground 24 No connection 25 No connection 26 25 TERMPWR 27 Ground 28 No connection 29 Ground 30 No connection 31 Ground 32 17 /ATN 33 Ground 34 No connection 35 Ground 36 6 /BUSY 37 Ground 38 5 /ACK 39 Ground 40 4 /RST 41 Ground 42 2 /MSG 43 Ground 44 19 /SEL 45 Ground 46 15 /C/D 47 Ground 48 1 /REQ 49 Ground 50 3 /I/O * A slash (/) before a signal name indicates that it is in the low state when active. Floppy Disk Drive Connection ---------------------------- All Power Macintosh models contain one internal Apple superDrive floppy disk drive, which supports GCR and MFM formats for 1.44 MB disks. Pin Signal Description Pin Signal Description --- ------ ----------- --- ------ ----------- 1 GND Ground 11 +5 V +5 V 2 PH0 Phase 0 state control 12 SEL Head select 3 GND Ground 13 +12 V +12 V 4 PH1 Phase 1 state control 14 /ENBL* Drive enable 5 GND Ground 15 +12 V +12 V 6 PH2 Phase 2 state control 16 RD Read data 7 GND Ground 17 +12 V +12 V 8 PH3 Phase 3 register write 18 WR Write data strobe 9 NC No connection 19 +12 V +12 V 10 /WRREQ Write data request 20 NC No connection * A slash (/) before a signal name indicates that it is in the low state when active. Monitor Support ---------------- The Power Macintosh 9500/120 includes an accelerated display card based on the mach64 graphics accelerator from ATI Technologies, Inc. Pin Description Pin Description --- ----------- --- ----------- 1 Red ground 9 Blue video signal 2 Red video signal 10 Monitor sense 2 3 Composite synchronization 11 Synchronization ground 4 Monitor sense 0 12 Vertical synchronization 5 Green video signal 13 Blue ground 6 Green ground 14 Horizontal synchronization ground 7 Monitor sense 1 15 Horizontal synchronization 8 No connection The Power Macintosh 9500/132 requires a third-party (non-Apple) graphics accelerator for display support. Sound I/O --------- All Power Macintosh computers contain external stereo 3.5mm jacks for sound I/O, connected through amplifiers to the AWAC chip. Panel label Description ----------- ----------- Audio In 8 k impedance, 2 V rms maximum, 22.5 dB gain available Audio Line Out 37 impedance, 0.9 V rms maximum, attenuated -22,5 dB (crosstalk degrades from -80 to -32 dB when the audio output is connectedto 32 headphones) |
Document Information | |
Product Area: | Computers |
Category: | Power Macintosh |
Sub Category: | Power Macintosh 9500 |
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