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Path: utzoo!mnetor!uunet!husc6!cmcl2!yale!mfci!news
From: news@mfci.UUCP (Usenet)
Newsgroups: comp.arch
Subject: Re: paging in the terminal driver
Message-ID: <191@m2.mfci.UUCP>
Date: Tue, 3-Nov-87 09:26:30 EST
Article-I.D.: m2.191
Posted: Tue Nov  3 09:26:30 1987
Date-Received: Tue, 10-Nov-87 04:51:08 EST
References: <573@elxsi.UUCP> <682@its63b.ed.ac.uk> <796@quacky.UUCP> <421@nuchat.UUCP> <918@sugar.UUCP> <16089@topaz.rutgers.edu>
Reply-To: ryland@m6.UUCP (Chris Ryland)
Organization: Multiflow Computer Inc., Branford, CT. 06405
Lines: 14
Keywords: output pagination
Summary: nit pick

In article <16089@topaz.rutgers.edu> ron@topaz.rutgers.edu (Ron Natalie) writes:
>The seperate CPU did little to offload work from the main CPU.
>The main reasdon it was there was so DEC didn't have to make
>special TOPS-20 tty cards.  They just used the 11/40's UNIBUS.
>The machine still passed the characters to the main CPU one at
>a time, interrupting on each one.  It's other big job in life
>is to print "%DECSYSTEM-20 NOT RUNNING" when the machine is down.

RSX20F did NOT interrupt the CPU on each character: it dropped
each character into a circular queue in -20 memory, with no
interrupts, and the -20 would scan the input queue every 20
milliseconds or so.  No interrupts needed.

Didn't want history to get rewritten.