Re: pranks

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#716

From: Henry Spencer
Date: Mon, 15 Jan 1990 18:57

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In article <1906@bucket.UUCP> leonard@bucket.UUCP (Leonard Erickson) writes:
>What can be real fun is hooking one of these modern RS-232 gizmos up to an 
>old unit. The spec allows mark to be anything from +5v to +25v, and space
>to be -5v to -25v (I may have mark and space reversed).At the full +/- 25v
>most modern PC equipment gets more than a little unhappy.

We actually have two violations of specs here. :-)  The first is that RS232B
permitted 25, but RS232C and later (I think RS232D is actually the current
one) dropped this to a max of 15 at the transmitter.  The other is that the
receivers are still supposed to be able to take 25, to be fully backward
compatible, so anything that can't is broken (but then PCs are broken anyway).
-- 
1972: Saturn V #15 flight-ready|     Henry Spencer at U of Toronto Zoology
1990: birds nesting in engines | uunet!attcan!utzoo!henry he...@zoo.toronto.edu

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References: <1990Jan7.053746.15266@cs.rochester.edu> <1906@bucket.UUCP>

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Path: mbox-mo1.pugleaf.net!gmdzi!unido!mcsun!uunet!clyde.concordia.ca!jarvis.csri.toronto.edu!utgpu!utzoo!henry
From: henry@utzoo.uucp (Henry Spencer)
Newsgroups: alt.folklore.computers
Subject: Re: pranks
Message-ID: <1990Jan15.185706.3974@utzoo.uucp>
Date: 15 Jan 90 18:57:06 GMT
References: <1990Jan7.053746.15266@cs.rochester.edu> <1906@bucket.UUCP>
Organization: U of Toronto Zoology
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Posted: Mon Jan 15 19:57:06 1990
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