HP-IL
The HP-IL (Hewlett-Packard Interface Loop), was a short-range interconnection bus or network introduced by Hewlett-Packard in the early 1980s. It enabled many devices such as printers, plotters, displays, storage devices (floppy disk drives and tape drives), test equipment, etc. to be connected to programmable calculators such as the HP-41C, HP-71B and HP-75C/D, the Series 80 and HP-110 computers, as well as generic ISA bus based PCs.
|
HP-IL connectors (on an HP-71B) | |||
| Type | Peripheral data bus | ||
|---|---|---|---|
| Production history | |||
| Designer | Hewlett-Packard | ||
| Designed | 1980s | ||
| Manufacturer | Hewlett-Packard | ||
| Superseded by | USB (mid-1990s) | ||
| General specifications | |||
| External | yes | ||
| Pins | 2 | ||
| Data | |||
| Data signal | Token ring | ||
| Bitrate |
160 kbit/s (limited to 16 kbit/s) | ||
| Max. devices |
31 (with extensions up to 960) | ||
| Protocol | Serial | ||
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