Low End System Interconnect - Revision history

Jnc: Add to cat of things that use it

2024-04-23T18:54:46Z

Add to cat of things that use it

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	[[Category: DEC Mass Storage]]		[[Category: DEC Mass Storage]]
	[[Category: DEC Interface Standards]]		[[Category: DEC Interface Standards]]
			[[Category: LESI]]

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2023-12-02T19:35:02Z

+Category

← Older revision		Revision as of 19:35, 2 December 2023
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	The '''Low End System Interconnect''' (often given in [[Digital Equipment Corporation\|DEC]] documentation as '''lowend system interconnect''', or some other variant, but the acronym, '''LESI''', is usual) is a DEC-standard [[bus]] used to connect [[mass storage]] devices to a [[device controller]].		The '''Low End System Interconnect''' (often given in [[Digital Equipment Corporation\|DEC]] documentation as '''lowend system interconnect''', or some other variant, but the acronym, '''LESI''', is usual) is a DEC-standard [[bus]] used to connect [[mass storage]] devices to a [[device controller]].

	The LESI is a set of [[input/output\|I/O]] [[conductor]]s, instantiated as a 50-conductor [[flat cable]] (for long runs, this may be implemented as a shielded, round cable). Communication across it uses the [[Mass Storage Control Protocol]].		The LESI is a set of [[input/output\|I/O]] [[conductor]]s, instantiated as a 50-conductor [[flat cable]] (for long runs, this may be implemented as a shielded, round cable). Communication across it uses the [[Mass Storage Control Protocol]].
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	[[Category: DEC Buses]]		[[Category: DEC Buses]]
	[[Category: DEC Mass Storage]]		[[Category: DEC Mass Storage]]
			[[Category: DEC Interface Standards]]

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2023-08-31T12:03:58Z

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← Older revision		Revision as of 12:03, 31 August 2023
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	[[Category: DEC Buses]]		[[Category: DEC Buses]]
			[[Category: DEC Mass Storage]]

Jnc: Very stubby, but there is not a lot available

2023-08-30T10:25:38Z

Very stubby, but there is not a lot available

New page

The '''Low End System Interconnect''' (often given in [[Digital Equipment Corporation|DEC]] documentation as '''lowend system interconnect''', or some other variant, but the acronym, '''LESI''', is usual) is a DEC-standard [[bus]] used to connect [[mass storage]] devices to a [[device controller]].

The LESI is a set of [[input/output|I/O]] [[conductor]]s, instantiated as a 50-conductor [[flat cable]] (for long runs, this may be implemented as a shielded, round cable). Communication across it uses the [[Mass Storage Control Protocol]].

Host interfacing is provided by the [[KLESI Low-End Storage Interconnect]] device controllers; controllers are available for the [[UNIBUS]], the [[QBUS]] and the [[VAX Bus Interconnect|VAXBI]] bus.

Devices that use it include the [[RC25 disk drive]] and [[TU81 magtape drive]].

{{semi-stub}}

==External links==

* [http://www.bitsavers.org/pdf/dec/magtape/tu81/EK-TUA81-TM_002_Nov85.pdf EK-TUA81-TM_002 TU81/TA81 Technical Manual] - the LESI is briefly described in Appendix A

[[Category: DEC Buses]]