View source for Digital Ethernet Large-scale-integration UNIBUS Adapter

[[Image:m7521.jpg|thumb|right|250px|M7521]]

The '''Digital Ethernet Large-scale-integration UNIBUS Adapter''' (short, and usual, name '''DELUA''') was [[DEC]]'s second [[UNIBUS]] to [[Ethernet]] [[network interface]]. It consisted of one [[DEC card form factor|hex]] board, the M7521.

A number of complex [[integrated circuit|chips]] are used:

* [[Motorola MC68000]] [[microprocessor]]
* [[LANCE]] Ethernet chip
* [[DEC part number]] 21-22703-02 (function currently unknown)

The DELUA has 128KB of [[Dynamic RAM|DRAM]] (using 64Kx1 DRAM chips), probably with [[parity]], used for both [[buffer]]s, and also to hold the microprocessor's [[object code|code]]; there is also 16KB of [[ROM]] containing its [[firmware]], which is copied to DRAM on startup, as the latter is faster.

==See also==

* [[Digital Ethernet UNIBUS Network Adapter|DEUNA]], the DELUA's predecessor

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==Further reading==

* ''DELUA Technical Description'' (EK-DELUA-TD)
* ''DELUA Field Maintenance Print Set'' (MP-01787)

==External links==

* [http://www.bitsavers.org/pdf/dec/unibus/EK-DELUA-UG-002.pdf DELUA User's Guide] (EK-DELUA-UG-002)
* [http://www.bitsavers.org/pdf/dec/unibus/firmware/DELUA/ DELUA] - firmware

[[Category: UNIBUS Network Interfaces]]
[[Category: Ethernet Interfaces]]