Re: IEC bus specification

From: Gbor Lnrt <lgb_at_lgb.hu>
Date: Tue, 31 Dec 2013 20:29:54 +0100
Message-ID: <20131231192954.GB12841@vega.lgb.hu>
On Tue, Dec 31, 2013 at 11:03:05AM -0800, Chris Osborn wrote:
> 
> On Dec 31, 2013, at 10:46 AM, Gábor Lénárt <lgb@lgb.hu> wrote:
> 
> > http://jderogee.tripod.com/projects/1541-III/files/IEC_disected-IEC_1541_info.pdf
> 
> This one is ok, but it has a few errors in it. I know there were at least 3 mistakes, but I can’t remember them all off the top of my head. It took a few months to figure it all out and get it working on a Raspberry Pi. The big one I remember is that it says that at the end of a sequence everyone releases the bus, which isn’t true. It also says “true” and “false” a lot instead of high/low which makes it confusing to read.

What is odd for me: the document talks about "true" and "false" and stating
that "true" is actually pulled low (0V). It's OK, however on the graph
later, it talks about "low" and "high". Now I am confused, so "low" means
about the voltage, so actually high=false, low=true .... ? Quite hard to
understand anything this way, when even the usage of notions is not
consistent :(

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Received on 2013-12-31 20:02:10

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