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A proper ISA IDE interface is quite simple, but not as easy as it might sound. There are some strange corner cases you should consider for full AT compatibility. You can find schematics for ISA IDE interface adapters in service manuals of computers slightly newer than you MFM portable computer. For example, check volume II of the Compaq Deskpro 386 technical ...


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How to build an ATA controller for the AT bus? You can't, as there isn't any. You want to connect IDE-Drives, right? IDE stands for Integrated Device Electronics. Which simply means that the full host controller is already part of the drive. It contains everything that is on your MFM controller, except for bus-buffering, address selection and extension ROM. ...


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