Hewlett-Packard HDSP-2000 Series  
Written by Accutron on 2017-02-17  

Devices included in this entry:

Hewlett-Packard HDSP-2000 (12-pin glass-on-ceramic DIP)
Hewlett-Packard HDSP-2010TXV (12-pin glass-on-ceramic DIP)
Hewlett-Packard QDSP-2021 (12-pin glass-on-ceramic DIP; pictured in thumbnail)

Hewlett-Packard first introduced the HDSP-2000 in 1976, as the display elements used in the HP 9825A desktop computer/calculator. Unlike HP's earlier mult-character displays which require external multiplexing circuitry, the HDSP-2000 is driven by four internal SIPO (Serial-In-Parallel-Out) shift registers, grouped in pairs in two planar dies housed within the display package. Serial data is shifted into the display in 28-bit words, and converted to parallel data which directs the multiplexing of the LED elements. All HDSP-2xxx series devices are packaged in glass and ceramic, and some models are actually built with red glass, a unique feature among the pantheon of early LED displays.

Hewlett-Packard HDSP-2000 intelligent alphanumeric displays, as installed in a HP 9825A computer/calculator.

Hewlett-Packard HDSP-2010TXV, a military variant with a red glass filter.

HDSP-2010TXV devices in original packaging.

Hewlett-Packard QDSP-2021, a variant with a clear glass filter.

This article is part of the [Integrated Optoelectronics] exhibit.

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