PC/104 board design
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PC/104 board design

 
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Robert Scott
Guest
Posted: Fri Dec 17, 2004 4:30 am    Post subject: PC/104 board design Reply with quote
Has anyone designed a custom PC/104 board? I may need to do that
soon. Am I right in assuming that the PC/104 (not the plus) is
essentially the same as the ISA bus in pin functions? All I need is
to define some I/O mapped input and output registers to interface with
my custom electronics.


-Robert Scott
Ypsilanti, Michigan
(Reply through this forum, not by direct e-mail to me, as automatic reply address is fake.)
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Jack Klein
Guest
Posted: Fri Dec 17, 2004 4:42 am    Post subject: Re: PC/104 board design Reply with quote
On Thu, 16 Dec 2004 23:30:18 GMT, no-one@dont-mail-me.com (Robert
Scott) wrote in comp.arch.embedded:

Quote:
Has anyone designed a custom PC/104 board? I may need to do that
soon. Am I right in assuming that the PC/104 (not the plus) is
essentially the same as the ISA bus in pin functions? All I need is
to define some I/O mapped input and output registers to interface with
my custom electronics.

PC104 is very similar to the ISA bus, although the bus drive current
requirements are less and there are limits as to how much power a
peripheral board can draw from the bus.

You can download a copy of the standard here:

http://www.romanviii.f9.co.uk/dspdesign/pc104standardparts/pc104.pdf

--
Jack Klein
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Paul Burke
Guest
Posted: Fri Dec 17, 2004 2:14 pm    Post subject: Re: PC/104 board design Reply with quote
Robert Scott wrote:
Quote:
Has anyone designed a custom PC/104 board? I may need to do that
soon. Am I right in assuming that the PC/104 (not the plus) is
essentially the same as the ISA bus in pin functions? All I need is
to define some I/O mapped input and output registers to interface with
my custom electronics.

Yes, it really is that trivial. Almost anything will work. Watch the
trace lengths if there are other peripheral boards in the system or you
want to sell it, if it's just for you you can break a lot of rules
before things stop working.

Paul Burke
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