Re: The history of the Linux OS

Brandon S. Allbery KF8NH (allbery@kf8nh.apk.net)
Thu, 26 Nov 1998 21:29:25 -0500

In message <Pine.LNX.4.05.9811261152560.20552-100000@tahallah.demon.co.uk>,
Ale
x Buell writes:
+-----
| On Thu, 26 Nov 1998, Brandon S. Allbery KF8NH wrote:
| > The ISA bus only has 10 I/O address lines, so I/O addresses above 0x03FF
| > effectively wrap around. The 8514/A ports ended up aliased to 0x02e8....
|
| port cards that has the broken 10bit address decoding circuitry. ISA buses
| doesn't provide the address decoding stuff I think, it's down to the ISA
| card to do it, I believe.
+--->8

True; but there are only 10 I/O address lines available in the ISA bus, so
there's no way to address above 0x03FF no matter how smart the card is.

Microchannel, EISA, and PCI support all 16 I/O address lines.

-- 
brandon s. allbery	[os/2][linux][solaris][japh]	 allbery@kf8nh.apk.net
system administrator	     [WAY too many hats]	   allbery@ece.cmu.edu
carnegie mellon / electrical and computer engineering			 KF8NH
			  Kiss my bits, Billy-boy.






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