Presentation	2002/11/29 Retrospection on Development of Fail Safe computers Ikumasa OKUMURA,
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Abstract(in English)	This is a retrospection paper on the development of the fail safe computer systems in the railway signaling field. At the start, this paper describes the fail safe systems in the railway signaling. In order to satisfy the fail safe requirements, the first system had used the fail safe parametrons as logical elements and the trance former typed ROM. This system had been developed in 1967. The second system had used the micro-processors 8085, and had been practically used in 1985. I had been concerned in development of the other 2 or 3 systems. This paper describes the episodes on the development of the fail safe computer systems.
Keyword(in Japanese)	(See Japanese page)
Keyword(in English)	Railway signaling / Safety / Fail Safe / Computer System
Paper #	DC2002-74
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Conference Information
Committee	DC
Conference Date	2002/11/29(1days)
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Paper Information
Registration To	Dependable Computing (DC)
Language	JPN
Title (in Japanese)	(See Japanese page)
Sub Title (in Japanese)	(See Japanese page)
Title (in English)	Retrospection on Development of Fail Safe computers
Sub Title (in English)
Keyword(1)	Railway signaling
Keyword(2)	Safety
Keyword(3)	Fail Safe
Keyword(4)	Computer System
1st Author's Name	Ikumasa OKUMURA
1st Author's Affiliation	Daido Signal Co.()
Date	2002/11/29
Paper #	DC2002-74
Volume (vol)	vol.102
Number (no)	492
Page	pp.pp.-
#Pages	6
Date of Issue