From: Ethan Grammatikidis <eekee57@fastmail.fm>
To: 9fans@9fans.net
Subject: Re: [9fans] /sys/include/ip.h 5c(1) - LONG POST
Date: Sat, 10 Oct 2009 02:34:31 +0100 [thread overview]
Message-ID: <20091010023431.7111a8f6.eekee57@fastmail.fm> (raw)
In-Reply-To: <4ACF99FF.9030809@conducive.org>
On Sat, 10 Oct 2009 04:15:59 +0800
W B Hacker <wbh@conducive.org> wrote:
>
> The only 'glue' needed was level-shifters - discrete transistors on my OSI
> Challenger II, Motorola 1488 & 1489 diode-coupled-logic on everything up until
> the 16XXX derivative of the 8250 was sucked into a 'bridge' chipset.
>
I remember being quite surprised by the first UARTs which had level
shifters on the chip, and they came out around 1993 or so didn't they?
As far as I know it was hardly possible to handle RS-232's 25V signals
on the same die as logic functions back in the 80s.
> PCDOS was lousy at I/O, and Windows no better.
Linux either. Makes me sad. ;-J
--
Ethan Grammatikidis
Those who are slower at parsing information must
necessarily be faster at problem-solving.
next prev parent reply other threads:[~2009-10-10 1:34 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <<4ACED151.8060901@conducive.org>
2009-10-09 15:12 ` [9fans] /sys/include/ip.h 5c(1) erik quanstrom
2009-10-09 17:51 ` [9fans] /sys/include/ip.h 5c(1) LONG POST W B Hacker
2009-10-09 18:25 ` [9fans] /sys/include/ip.h 5c(1) lucio
2009-10-09 20:15 ` [9fans] /sys/include/ip.h 5c(1) - LONG POST W B Hacker
2009-10-10 1:34 ` Ethan Grammatikidis [this message]
2009-10-10 2:30 ` W B Hacker
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