Subject: Re: Simple ISA design to simple PCI design?
Date: Wed, 6 Nov 2002 07:02:21 +0000 (UTC)
NNTP-Posting-Date: Wed, 6 Nov 2002 07:02:21 +0000 (UTC)
User-Agent: tin/1.5.14-20020926 ("Soil") (UNIX) (Linux/2.4.19 (i686))
Keith R. Williams wrote:
> In article ,
> email@example.com says...
>> Aleksandar Stancic wrote:
>> > HI!
>> > I've made an ISA board with two 8255s and one GAL16V8 chip.
>> > The GAL is used to detect the address, IOR, IOW and AEN.
>> > Is it possible to make a simple PCI equivalent?
>> At least not quite as simple.
> There is also the PLX PCI9052 which bridges PCI to ISA, among
> other busses.
>> To be a proper PCI card, you also need to do various things that are
>> otherwise unrelated.
>> Thinking carefully about the possibility of using USB, or serial/parallel
>> ports may be a good idea.
> True. PCI isn't easy to tinker with. USB isn't a picnic either.
> I'd go with the parallel port if the performance isn't a huge
USB is more accessible, there are a large number of
microcontrollers that do USB, some of which have nice devkits, and are
reasonably cheap ($1)
You then have to connect two data wires, from a cable, which isn't
For PCI, you need at least a 2 layer board, SMD is pretty much mandatory,
the mechanical construction is a lot harder as the tollerances are smaller
the frequencies are higher, ...
If it's something you might want to go on using, then you probably want
to be somewhat carefull.
For example, with the parallel port, computers with them built in
will get less common in the next 5 years, if you want to be able to use
it on a USB-parallel converter, then you'r going to have to play like
a printer, at least enough so that you can talk to the ASIC inside the
Then of course, for some things, thinking laterally might be a plus.
Do you really need a custom data acquisition card, when a $5 soundcard,
with the input caps bridged will work, ...
http://inquisitor.i.am/ | mailto:firstname.lastname@example.org | Ian Stirling.
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