VIC-20 User I/O
Available at the Commodore VIC-20 computer.
Pinout
24 PIN MALE EDGE (DZM 12 DREH) at the computer.
| 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 |
Note: 0.156" (3.96mm) contact spacing.
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
- Joakim Ögren
- Nikolas Engström
- Arwin Vosselman
- Jestin Nesselroad
- Larry Anderson
Sources
- Commodore VIC-20 User Manual
- Commodore VIC-20 Programmer's Reference Guide
- NT Rautanen Tietokonesivut: Commodore