DB-9 Mouse or Joystick Port
---------------------------
1- MOUSEID* Mouse identifier: when active, disables NE556 hand controller timer.
2- +5V total current drain from this pin must not exceed 100 mA.
3- GND System Ground.
4- XDIR Mouse X-direction indicator.
5- XMOVE Mouse x-movement interrupt.
6- N.C. Not connected.
7- MSW* Mouse button.
8- YDIR Mouse Y-direction indicator.
9- YMOVE Mouse Y-movement interrupt.
1- GAMESW1 Switch input 1 (sometimes called paddle button 1).
2- +5V total current drain from this pin must not exceed 100mA.
3- GND System ground.
4- Not Used for hand controller.
5- PDL0 hand controller input. Must be connected to a 150K ohm variable resistor connected to +5V.
6- N.C. Not connected.
7- GAMESW0 Switch input 0 (sometimes called paddle button 0).
8- PDL1 hand controller input; must be connected to a 150K ohm variable resistor connected to +5V.
9- Not used with hand controller.
DB-19 Disk Drive Port
-----------------
1,2,3- Ground.
4- 3.5DISK 3.5 or 5.25-inch drive select.
5- -12V -12 volt supply.
6- +5V +5 volt supply.
7- +12V +12 volt supply.
8- +12V +12 volt supply.
9- DR2 Drive 2 Select.
10- WRPTOTECT Write protect input.
11- PHASE0 Motor Phase 0 output.
12- PHASE1 Motor Phase 1 output.
13- PHASE2 Motor Phase 2 output.
14- PHASE3 Motor Phase 3 output.
15- WREQ Write request.
16- HDSEL Head Select.
17- DR1 Drive 1 select.
18- RDDATA Read data input.
19- WDATA Write data output.
Note: Power connectors on this port are for use by the disk drive only.
DB-15 Video Expansion Connector
-------------------------------
1- TEXT Video text signal from TMG; set to inverse of GR, except in double high-resolution mode.
2- 14M 14M master timing signal from the system oscillator.
3- SYNC* Displays horizontal and vertical synchronization signal from IOU pin 39.
4- SEGB Displays vertical counter bit from IOU pin 4; in text mode, indicates second low-order vertical counter; in graphics mode, indicates low-resolution.
5- 1VSOUND One-volt sound signal from pin 5 of the audio hybrid circuit (AUD).
6- LDPS* Video shift-register load enable from pin 12 of TMG.
7- WNDW* Active area display blanking; includes both horizontal and vertical blanking.
8- +12V Regulated +12 volts DC; can drive 300mA.
9- PRAS* RAM row-address strobe from TMG pin 19.
10- GR Graphics mode enable from IOU pin 2.
11- SEROUT* Serialized character generator output from pin 1 of the 74LS166 shift register.
12- NTSC Composite NTSC video signal from VID hybrid chip.
13- GND Ground reference and supply.
14- VIDD7 From 74LS374 video latch; causes half-dot shift high.
15- CREF Color reference signal from TMG pin 3; 3.58 MHz.
Note: The signals at the DB-15 on the Apple IIc are not the same as those at the DB-15 end of the Apple III, Apple IIGS, and Macintosh II. Do not attempt to plug a cable intended for one into the other.
Several of these signals, such as the 14 MHz, must be buffered within about 4 inches of the back panel connector--preferably inside a container directly connected to the back panel.
MiniDin-8 Modem Port
------------------
1- DTR Data Terminal Ready (output).
2- DSR Data Set Ready (input).
3- TD Transmit Data (output).
4,6,8- Ground.
5- RD Read Data (input).
7- N.C. Not connected.
Start-up Characteristics
--------------------
300 baud
8 data bits
No parity
1 stop bit
No screen echo
No Line Feed after Carriage Return (no LF after CR)
No Carriage Returns in output stream
Command Char= Control-A
MiniDin-8 Printer Port
----------------------
1- DTR Data Terminal Ready (output).
2- DSR Data Set Ready (input).
3- TD Transmit Data (output).
4,6,8- Ground.
5- RD Read Data (input).
7- N.C. Not connected.
Start-up Characteristics
------------------------
9600 baud
8 data bits
No parity
2 stop bits
80-column line
No screen echo
Line Feed after Carriage Return
Command Char= Control-I
The MiniDin-8 pin configuration is this: As you look at the back of the machine, pin 1 being lower-right, pin 3 middle-right, pin 6 upper-right.
8 7 6
5 4 3
2 1