On Fri, 28 Jan 2011, Kirk Wallace wrote:
> Date: Fri, 28 Jan 2011 09:47:57 -0800
> From: Kirk Wallace <kwall...@wallacecompany.com>
> Reply-To: "Enhanced Machine Controller (EMC)"
> <emc-users@lists.sourceforge.net>
> To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net>
> Subject: Re: [Emc-users] Second (PCI) parallel port card
>
> On Fri, 2011-01-28 at 11:18 -0600, Jon Elson wrote:
>> Mark Wendt wrote:
>>> Really makes one wonder how any of this stuff works at all. You gotta
>>> love it. A standard with no real standards... ;-)
>>>
>> Yes, completely appalling, and I have to keep hopping to make my boards
>> work with a wide variety of par port chips. What a nightmare! I think
>> I finally have all of my boards set up so that if they don't work with
>> any particular parallel port, I can pretty honestly say "It's not MY
>> fault!" It is totally amazing to me that these chips can't even follow
>> the LOOSE standard laid out in those docs, which just kind of show this
>> signal comes before that one.
>>
>> Jon
>
> I'm beginning to think that maybe the most popular chip, maybe Moschip
> 9815, should be considered the standard, then make it work on that. The
> Lava and Siig cards may be better, but the Moschips are easy to find and
> cheap.
The MOSchip 98XX series chips do not implement EPP in any way thats useful,
not only do they sample read data on the leading edge of the strobe so theres
no way to control their read timing (all other chips I've seen sample on the
trailing edge (allowing handshaking to work), they do no even do wrong
thing consistantly...
This is why the MOSChip data sheet say not to use EPP mode...
Peter Wallace
Mesa Electronics
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