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8 Bit ISA IDE

I got this hunch that some 16-bit ide controller can work on 8 bit isa slot, but not sure if it will work on XT. I believe i have seen an ide controller with AT/XT or 8bit/16bit jumper.
 
You're absolutely right, many 16-bit IDE controllers do work in 8-bit slots. Many of them don't even need to have a jumper set, and can detect 8 or 16 bit slots automatically. However, installing the card in an XT will normally only let you use the Floppy controller, Serial and Parallel ports. Unlike ATs, XTs need controllers with their own BIOSes to provide hard disk support. So, unless you can find a 16-bit IDE controller with a ROM chip, the IDE functions won't work in an XT.
 
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