I/O Ports

Commodore
PC
Atari
Misc.
Commodore 64 user port
PC Gameport connector
Atari 7800 joystick port
Centronics parallel connector
C16/C116/+4 Joystick connector
ps/2 port
Atari 5200 joystick port
C64 Serial I/O connector
PC / XT Keyboard
Atari 2600 joystick port
C64 RS232 User Port
AT Keyboard
Amiga mouse/joy
Amiga (1000/2000/3000) Keyboard
Amiga (A4000/cdtv) keyboard

 

 

 

C64 User Port connector
Pin Name Description
1 GND Ground
2 +5V +5 VDC (100 mA max)
3 /RESET Reset, will force a Cold Start. Also a reset output for devices.
4 CNT1 Counter 1, from CIA #1
5 SP1 Serial Port 1, from CIA #1
6 CNT2 Counter 2, from CIA #2
7 SP2 Serial Port 2, from CIA #2
8 /PC2 Handshaking line, from CIA #2
9 ATN Serial Attention In
10 +9V AC +9 VAC (+ phase) (100 mA max)
11 +9V AC +9 VAC (- phase) (100 mA max)
12 GND Ground
     
A GND Ground
B /FLAG2 Flag 2
C PB0 Data 0
D PB1 Data 1
E PB2 Data 2
F PB3 Data 3
H PB4 Data 4
J PB5 Data 5
K PB6 Data 6
L PB7 Data 7
M PA2 PA2
N GND Ground

C16/C116/+4 Joystick connector
At the commodore(Male) Joystick(Female)

Joystick 2

Pin Name Comment
1 JOYA0  
2 JOYA1  
3 JOYA2  
4 JOYA3  
5 +5VDC  
6 BUTTON A  
7 GND  
8 COMMON A ? Is connected to DATA2 thru a buffer.

Joystick 2

Pin Name Comment
1 JOYB0  
2 JOYB1  
3 JOYB2  
4 JOYB3  
5 +5VDC  
6 BUTTON B  
7 GND  
8 COMMON B ? Is connected to DATA1 thru a buffer.

PC Gameport connector
Computer(Female) Cable(Male)
Pin Name Description
1 +5V +5 VDC
2 /B1 Button 1
3 X1 Joystick 1 - X
4 GND Ground
5 GND Ground
6 Y1 Joystick 1 - Y
7 /B2 Button 2
8 +5V +5 VDC
9 +5V +5 VDC
10 /B4 Button 4
11 X2 Joystick 2 - X
12 GND Ground
13 Y2 Joystick 2 - Y
14 /B3 Button 3
15 +5V +5 VDC

Centronics parallel connector
Pin Name Description
1 /STROBE Strobe
2 D0 Data Bit 0
3 D1 Data Bit 1
4 D2 Data Bit 2
5 D3 Data Bit 3
6 D4 Data Bit 4
7 D5 Data Bit 5
8 D6 Data Bit 6
9 D7 Data Bit 7
10 /ACK Acknowledge
11 BUSY Busy
12 POUT Paper Out
13 SEL Select
14 /AUTOFEED Autofeed
15 n/c Not used
16 0 V Logic Ground
17 CHASSIS GND Shield Ground
18 +5 V PULLUP +5 V DC (50 mA max)
19 GND Signal Ground (Strobe Ground)
20 GND Signal Ground (Data 0 Ground)
21 GND Signal Ground (Data 1 Ground)
22 GND Signal Ground (Data 2 Ground)
23 GND Signal Ground (Data 3 Ground)
24 GND Signal Ground (Data 4 Ground)
25 GND Signal Ground (Data 5 Ground)
26 GND Signal Ground (Data 6 Ground)
27 GND Signal Ground (Data 7 Ground)
28 GND Signal Ground (Acknowledge Ground)
29 GND Signal Ground (Busy Ground)
30 /GNDRESET Reset Ground
31 /RESET Reset
32 /FAULT Fault (Low when offline)
33 0 V Signal Ground
34 n/c Not used
35 +5 V +5 V DC
36 /SLCT IN Select In (Taking low or high sets printer on line or off line respectively)

C64 Serial I/O connector
Computer(Female) Cable(Male)
Pin Name Description
1 /SRQIN Serial SRQIN
2 GND Ground
3 ATN Serial ATN In/Out
4 CLK Serial CLK In/Out
5 DATA Serial DATA In/Out
6 /RESET Reset

C64 RS232 User Port

Available on the Commodore C64/C128. Software emulated.
The signals does not have true RS232 levels.
It's TTL level, and RXD/TXD is inverted.
It's just the normal User Port, used as a RS232 port
Pin Name RS232 Description
A GND GND Protective Ground
B+C FLAG2+PB0 RxD Receive Data (Must be applied to both pins!)
D PB1 RTS Ready To Send
E PB2 DTR Data Terminal Ready
F PB3 RI Ring Indicator
H PB4 DCD Data Carrier Detect
K PB6 CTS Clear To Send
L PB7 DSR Data Set Ready
M PA2 TxD Transmit Data
N GND GND Signal Ground

Atari 7800 joystick
9 PIN D-SUB MALE at the Atari. 9 PIN D-SUB FEMALE at the joystick cable.
Pin Color Description
1 WHT Up
2 BLU Down
3 GRN Left
4 BRN Right
5 RED Button (R)ight (-)
6 ORG Both buttons (+)
7 n/c Not connected
8 BLK Ground(-)
9 YLW Button (L)eft (-)

Atari 5200 joystick
15 pin d-sub male at the atari 15 pin d-sub female at the joystick cable
Pin Description
1 Keypad -- right column
2 Keypad -- middle column
3 Keypad -- left column
4 Start, Pause, and Reset common
5 Keypad -- third row and Reset
6 Keypad -- second row and Pause
7 Keypad -- top row and Start
8 Keypad -- bottom row
9 Pot common
10 Horizontal pot (POT0, 2, 4, 6)
11 Vertical pot (POT1, 3, 5, 7)
12 5 volts DC
13 Bottom side buttons (TRIG0, 1, 2, 3)
14 Top side buttons
15 0 volts -- ground

Atari 2600 joystick
9 PIN D-SUB MALE at the Atari. 9 PIN D-SUB FEMALE at the joystick cable.
Pin Color Description
1 WHT Up
2 BLU Down
3 GRN Left
4 BRN Right
5 n/c Not connected
6 ORG Button
7 n/c Not connected
8 BLK Ground(-)
9 n/c Not connected

 

Amiga mouse/joy
9 PIN D-SUB MALE at the computer. 9 PIN D-SUB FEMALE at the mouse/joy cable.
Pin Mouse/Trackball Lightpen Digital Joystick Paddle Comment
1 V-pulse n/c /FORWARD BUTTON 3  
2 H-pulse n/c /BACK n/c  
3 VQ-pulse n/c /LEFT BUTTON 1  
4 HQ-pulse n/c /RIGHT BUTTON 2  
5 BUTTON 3(M) Penpress n/c PotX  
6 BUTTON 1(L) /Beamtrigger /BUTTON 1 n/c  
7 +5V +5V +5V +5V 50 mA max
8 GND GND GND GND  
9 BUTTON 2(R) BUTTON 2 BUTTON 2 PotY  

Amiga (1000/2000/3000) Keyboard

5 PIN DIN 180° (DIN41524) FEMALE (A1000/A2000/A3000) at the computer.
Pin A1000 A2000/A3000
1 +5 Volts KCLK
2 CLOCK KDAT
3 DATA n/c
4 GND GND
5 n/c +5 Volts

IBM PS/2

6 PIN MINI-DIN FEMALE (PS/2 STYLE) at the computer.
Pin Name Description
1 DATA Key Data
2 n/c Not connected
3 GND Ground
4 VCC Power , +5 VDC
5 CLK Clock
6 n/c Not connected

Amiga (A4000/cdtv) keyboard

6 PIN MINI-DIN FEMALE (PS/2 STYLE) (A4000/CDTV) at the computer
Pin Name Description
1 /DATA Data
2 n/c Not connected
3 GND Ground
4 +5V +5 Volts DC (100 mA max)
5 CLOCK Clock
6 n/c Not connected

PC / XT Keyboard

5 PIN DIN 180° (DIN41524) FEMALE at the computer.
Pin Name Description Technical
1 CLK Clock CLK/CTS, Open-collector
2 DATA Data RxD, Open-collector
3 /RESET Reset  
4 GND Ground  
5 VCC +5 VDC  

PC AT Keyboard

5 PIN DIN 180° (DIN41524) FEMALE at the computer
Pin Name Description Technical
1 CLOCK Clock CLK/CTS, Open-collector
2 DATA Data RxD/TxD/RTS, Open-collector
3 n/c Not connected Reset on some very old keyboards.
4 GND Ground  
5 VCC +5 VDC