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Available at the Commodore [[VIC-20]] computer.

== Pinout ==

[[Image:dzm12dreh.png]]

24 PIN MALE EDGE (DZM 12 DREH) at the computer.

{| {{border}}
! 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   || JOY0            || This pin is connected to joystick switch 0 (See game port).
|-
| 5   || JOY1            || This pin is connected to joystick switch 1 (See game port).
|-
| 6   || JOY2            || This pin is connected to joystick switch 2 (See game port).
|-
| 7   || LIGHT PEN       || This pin also acts ad the input for the joystick fire button (See game port).
|-
| 8   || CASSETTE SWITCH || This pin is connected to the sense cassette switch line.
|-
| 9   || ATN             || Serial Attention In
|-
| 10  || +9V AC          || +9 VAC (+ phase)
|-
| 11  || +9V AC          || +9 VAC (- phase)
|-
| 12  || GND             || Ground
|-
|     ||                 ||
|-
| A   || GND             || Ground
|-
| B   || CB1             || CB1
|-
| 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   || CB2             || CB2
|-
| N   || GND             || Ground
|}

<i>Note: 0.156" (3.96mm) contact spacing.</i>

The VIC gives you complete control over Port B on VIA chip #1.
Eight lines for input or output are available, as well as 2 lines
for handshaking with an outside device. The I/O lines for Port B
are controlled by two locations. One is the port itself, and is
located at 37136 ($9110 hex). Naturally you PEEK it to read an
input, or POKE it to set an output. Each of the eight I/O lines
can be set up as either an input or an output by setting the data
direction register properly. It is located at 37138 ($9112 hex).

== Contributions ==
* [[User:Joakim|Joakim Ögren]]
* [mailto:nikolas.engstrom@pop.landskrona.se Nikolas Engström]
* [mailto:arwin@xs4all.nl Arwin Vosselman]
* Jestin Nesselroad
* [mailto:foxnhare@bigvalley.net Larry Anderson]

== Sources ==
* Commodore VIC-20 User Manual
* Commodore VIC-20 Programmer's Reference Guide
* [http://www.ntrautanen.fi/computers/commodore/index.htm NT Rautanen Tietokonesivut: Commodore]

[[Category:Connector]]
[[Category:Expansion]]