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From: DAVISM@kcgl1.eng.ohio-state.edu (Michael T. Davis)
Newsgroups: comp.sys.atari.8bit
Subject: Re: Atari 800XL Parallel Bus Documentation
Message-ID: <1711@quanta.eng.ohio-state.edu>
Date: 7 Feb 89 16:09:11 GMT
References: <1270016@hpclkms.HP.COM> <3885@druhi.ATT.COM>
Sender: news@quanta.eng.ohio-state.edu
Organization: Ohio State University
Lines: 47


	In article <3885@druhi.ATT.COM>, dlm@druhi.ATT.COM (Dan Moore) writes:

>in article <1270016@hpclkms.HP.COM>, ken@hpclkms.HP.COM (Kenneth Sumrall) says:
[Info regarding articles from ANTIC or ANALOG about XL parallel port deleted]
>
>	The articles did *not* describe the parallel expansion bus on
>the XL.  They described the bus in the 1090 expansion box which has
>several differences (buffers, power, a couple of new signals).  You can
>use the information to figure out what is actually on the expansion bus
>just don't expect it to be a 100% match.  The software driver information
>applies to both the expansion bus and to the 1090 bus.

	Both MAPPING THE ATARI (Revised Edition -- which I refer to as MTA+)
and the articles themselves (ANTIC) portrayed the diagrams/information as
pertaining to the XL bus (known as the Parallel Bus Interface - PBI).  No
where in the articles is the 1090 even mentioned.  BTW, MTA+ says the
information is from the ANTIC articles.  ANALOG also had an article on
adding 2K (of static RAM) to a 600XL.  I did discover a difference between
the pin-outs in the ANTIC article(s) and the ANALOG article.  (I suspect that,
in fact, the pin-out from the ANTIC article WAS the 1090 pin-out, and the
pin-out in the ANALOG article was from the PBI, itself.  Can anyone confirm/
disprove this?)  If anyone needs them, I can supply months and pages from both
magazines.  (The mags are in my apt. and I'm at work, so they're not currently
accessible.  I just looked through the ANTIC articles last night.  I wish I
had written that stuff down...20/20 hindsight, as usual.)
>
>	I don't think Atari ever "officially" released any info on the
>expansion bus.  There was a very nice manual written up on the XL (OS,
>hardware, etc) but it died about the time Jack bought Atari.
>
	I have heard of several people claiming to have the XL Addendum to
the Technical Reference Notes, or some such thing.  I would be very interested
to know where one could pick these up.  On the other hand, the manual that
comes with the XE (at least the 130XE; I can't speak for the 65XE or the XEGS)
included pin-outs for ALL the ports on the computer...nice touch.

							Mike

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