![]() 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Superseded by | USB (mid-1990s) | ||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) [1] | ||
Max. devices |
31 (with extensions up to 960) | ||
Protocol | Serial |
The HP-IL (Hewlett-Packard Interface Loop) was a short-range interconnection bus or network introduced by Hewlett-Packard in the early 1980s.[1] 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.
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