Texas Instrument documentation on an "AN-770" microchannel adapter that had a 16552
UART chip able to do DMA transfers: https://www.ti.com/lit/an/snla024/snla024.pdf
The Description File would have been @6E6D.ADF - and is listed within the document.
It is not in the repository for anything released commercially. Of interest, it is a good
primer on the 82C611 chip interface.
"AN-770" microchannel adapter
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