Messages in this thread | | | Subject | Re: The history of the Linux OS | Date | Thu, 26 Nov 1998 21:29:25 -0500 | From | "Brandon S. Allbery KF8NH" <> |
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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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