Commodore bus
The Commodore serial IEEE-488 bus (IEC Bus), is Commodore's interface for primarily magnetic disk data storage and printers for Commodore 8-bit home computers: the VIC-20, Commodore 64, Commodore 128, Plus/4, Commodore 16, and Commodore 65.
| Type | Peripheral bus | ||
|---|---|---|---|
| Production history | |||
| Designer | Commodore International | ||
| Designed | 1980 | ||
| Manufacturer | Various | ||
| Produced | 1980–present | ||
| General specifications | |||
| Length | 1.8 meters maximum | ||
| Hot pluggable | No | ||
| Daisy chain | Yes, up to 31 devices | ||
| External | Yes | ||
| Pins | 6 | ||
| Connector | DIN connector | ||
| Electrical | |||
| Signal | Open collector 5 V | ||
| Max. voltage | 5 V | ||
| Max. current | 3.2 mA | ||
| Data | |||
| Data signal | Yes | ||
| Bitrate | 3.2–41.6 kbit/s | ||
| Protocol | Serial | ||
| Pinout | |||
| Female socket from the front. | |||
| Pin 1 | SRQ | Service Request | |
| Pin 2 | GND | Ground | |
| Pin 3 | ATN | Attention | |
| Pin 4 | CLK | Clock | |
| Pin 5 | DATA | Data | |
| Pin 6 | RESET | Reset | |
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