Re: -5v and -12v Serial Ports

On 02 Jun 2007 05:29:09 GMT, Puckdropper <puckdropper@xxxxxxxxx>
wrote:

stratus46@xxxxxxxxx wrote in news:1180754218.386671.29590
@o11g2000prd.googlegroups.com:

*snip*

ISA slot? Where would you find one of those? I needed an ISA slot for
an EPROM programmer 4 or 5 years ago and the best I could do was a
late 90's Biostar board on eBay for $35. I also keep a Pentium 166
machine and a K6-2 550 'just in case'

GG


You can get PCI to ISA adapters... but I don't know how well they'll
work... DAGS if you're interested.

Puckdropper

I keep ISA-based machines around, mostly because it is very easy for
me to design and wire up a custom ISA board that works and ... very
difficult for a hobbyist like me with reasonable tools at hand to do
that for PCI. I just don't have the stuff I need for reflection wave
technology. So ISA is important to me.

The ISA, once PCI came about, was supported by the south bridge. The
simpler ISA transactions can be popped over to the PCI bus okay, but
ISA DMA in particular has no equivalent on the PCI bus and there is no
way to map it correctly without "sideband" channels to let the main
chipset know what in the hell is going on. A PCI-to-ISA adapter, if
it doesn't also have access to sideband wires, won't be able to do all
DMA transactions, for certain. And if the motherboard wasn't designed
to handle ISA at the start, it's likely those lines aren't available
in a special connector and it's also likely the BIOS can't set things
up. If a BIOS is included in the adapter, it will itself need to
contend with a wide variety of possible motherboards, which also seems
"hard" or "unlikely," too. I'd just assume "no ISA DMA" in that case.

Jon
.

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