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From: rav@goanna.cs.rmit.edu.au (Robin Vowels)
Subject: Re: Exception Handling
Date: 1996/10/07
Message-ID: <539ol1$hvi$1@goanna.cs.rmit.edu.au>#1/1
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Date: 1996-10-07T00:00:00+00:00
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	Fritz@Peacham.com (Fritz Schneider) writes:

	>Bob Halpern <wumpus@ix.netcom.com> wrote:
	>>Robin Vowels wrote:
	>>>         >|> Where did the concept of exception handling originate ? For example,
	>>>         >|> which languages were first to support this, or which papers first
	>>>         >|> proposed exception handling ?
	>>> 
	>>> The IBM System 360 (c. 1965) had an interrupt system that could
	>>> trap a range of computational conditions (division by
	>>
	>>There was hardware and software for exception handling that predated the
	>>360.

	>The IBM 709 (a vacuum tube machine) introduced the concept of data
	>channels (now called DMA) in a commercial product ca. 1957. This
	>included interruptions, referred to in that architecture as traps. The
	>current instruction address was stored in a fixed location and control
	>was given to the channel trap routine which stored the registers and
	>processed the interruption. The instruction set included the TTR (TRAP
	>TRANSFER) instruction used to return from interruptions. It could not
	>be trapped, so the next interruption would occur back in the user
	>program rather than in the trap routine.
	>Fritz Schneider >Peacham Cybernetics >Sunnyvale, California

Thanks for that info.

As far as DMA goes, the English Electric DEUCE computer
(c. 1955) performed asynchronous transfer between drum and
main memory.  I think that the ACE computer (c. 1950) did also.