Here is a list of LaserWriter II I/O board pinouts:
LaserWriter II Mini Circular-8 RS-422:
-------------------------------------
Pin Signal Description
1 HSKo Handshake output
2 HSKi Handshake input
3 TxD- Transmit data -
4 SG Signal Ground
5 RxD- Receive data -
6 TxD+ Transmit data +
7 RxD+ Receive data +
LaserWriter II RS-232C:
-----------------------
Pin Signal Description
1,7 * SGnd Signal Ground
2 * Txd Transmit Data
3 * Rxd Receive Data
4 Rts Request to send
5 Cts Clear to send
6 DSR Data Set Ready
8 DCD Data Carrier Detect
20 DTR Data Terminal Ready
22 Ring Ring indicator
* Only pins 1 (or 7,) 2, and 3 are needed by the LaserWriter II. The other pins
exist for support of communication with devices requiring specific hardware
handshaking.
NOTE: The RS-232C connnector on the LaserWriter is configured as Data Terminal
Equipment (DTE), which means that you can connect it directly to a modem or
host computer that is configured as Data Communication Equipment (DCE) without
any signal reversals. Connection to another DTE device, such as a Macintosh or
IBM-compatible, requires that the TxD and the RxD of each connector be crossed
connected.
LaserWriter IIsc, IIntx, IIf and IIg SCSI port:
-----------------------------------------------
Pin Signal
26 /DATA0
27 /DATA1
28 /DATA2
29 /DATA3
30 /DATA4
31 /DATA5
32 /DATA6
33 /DATA7
34 /PARITY
38 +5V
41 /ATN
43 /BUSY
44 /ACK
45 /RST
46 /MSG
47 /SEL
48 C/D
49 REQ
50 I/O
Pins 1-12, 14-25, 35-37, 39, 40, 42 are GROUND. Pin 13 is not connected.
Apple DeskTop Bus Mini Circular-4:
----------------------------------
Pin Signal Description
1 Bi-directional Data
2 Not Connected
3 Not connected
4 Ground
LaserWriter IIg ethernet connector:
----------------------------------
Pin Signal Description
1 FN Pwr Power (+12V @ 2.1W or +5V @ 1.9W)
2 DI-A Data In circuit A
3 DI-B Data In circuit B
4 VCC Voltage Common
5 CI-A Control In circuit A
6 CI-B Control In circuit B
7 +5V +5 volts (from host)
8 +5V Secondary +5 volts (from host)
9 DO-A Data Out circuit A
10 DO-B Data Out circuit B
11 VCC Secondary Voltage Common
12 NC Reserved
13 NC Reserved
14 FN Pwr Secondary +12V @ 2.1W or +5V @ 1.9W
Shell Prot Gnd Protective Ground
Article Change History:
23 Jun 1994 - Reviewed for technical accuracy, revised formatting, added
LaserWriter IIf and IIg.
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