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THE UNIVERSITY OF MICHIGAN Memorandum COMPARATIVE EVALUATION OF DIGITAL EQUIPMENT CORPORATION'S 340 AND 330 DISPLAY CONTROLS

IP.com Disclosure Number: IPCOM000128380D
Original Publication Date: 1966-Jun-01
Included in the Prior Art Database: 2005-Sep-15
Document File: 6 page(s) / 22K

Publishing Venue

Software Patent Institute

Related People

Stephen F. Lundstrom: AUTHOR [+4]

Abstract

This evaluation was compiled during the development of the display specifications for one of the remote display consoles at The University of Michigan.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 32% of the total text.

Page 1 of 6

THIS DOCUMENT IS AN APPROXIMATE REPRESENTATION OF THE ORIGINAL.

THE UNIVERSITY OF MICHIGAN Memorandum COMPARATIVE EVALUATION OF DIGITAL EQUIPMENT CORPORATION'S 340 AND 330 DISPLAY CONTROLS

Stephen F. Lundstrom
H. Westervelt, Project Director

ORA Project 07449 supported by:
DEPARTMENT OF DEFENSE
ADVANCED RESEARCH PROJECTS AGENCY WASHINGTON, D. C.

CONTRACT NO. DA-49-083 OSA-3050 ARPA ORDER NO. 716

administered through:

OFFICE OF RESEARCH ADMINISTRATION ANN ARBOR June 1966

This evaluation was compiled during the development of the display specifications for one of the remote display consoles at The University of Michigan.

The DEC 330 Display is the name given the DEC 338 Buffered Display when it is supplied without the PDP-8. For purposes of this evaluation, the 330 and 340 are configured with standard options to have, as much as possible, the same capabilities.

The evaluation is divided into three basic sections. The first is a cost comparison. The second is a comparison of the execution time and instruction size for the basic operations causing display of information. The final section, which comprises the bulk of the evaluation, compares the equivalent instructions in each display.

The 330 Display Control is clearly the best display on an economic and technical basis. When these displays are compared in the environment of a PDP-7, one more factor should be noted. The 340 Display has a fair amount of software support on the PDP-7. The 330 Display can use the same display pro- grams as the 338, but the control programs must be translated to the PDP-7 from the PDP-8. When the 330 Display is used on the PDP-7, only the low order 12 bits of the 18 bit word are used for display programs. This fact allows the display structure to be imbedded in a higher order data structure which could use the high order 6 bits for other information pertinent to the data structure. Thus, the 330 Display is probably the best display to connect to the PDP-7 in a research environment. In a production environment, more weight will probably have to be given to the software support of the 340. 340 Display 330 Display Cost Item Subtotal Item Subtotal Display $25,800 $25,800

Subroutine Interface 3,358 29,158

University of Michigan Page 1 Jun 01, 1966

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THE UNIVERSITY OF MICHIGAN Memorandum COMPARATIVE EVALUATION OF DIGITAL EQUIPMENT CORPORATION'S 340

AND 330 DISPLAY CONTROLS

$37,000 $37,000

Light Pen 1,625 30,783 Pushbutton Box NA Character Generator 11,600 42,383 6,000 43,000

Interface to PDP-7 900 43,283*

$53,000 (DEC Interface)

or

$44,000 (U of M Interface)

*Note: If the $5,000 costs of an additional pushbutton box on the 330 Display is used as an estimate for a pushbutton box on the 340 Display, the total 340 Display cost is $48,283.

(Image Omitted: Figure containing following caption omitted: TIMING AND INSTRUCTION SIZE (Display Instructions))

(Image Omitted: Figure containing following caption omitted: NOTES:

Requires two words if both coordinate...