From Newsgroup: comp.sys.ibm.ps2.hardware

https://archive.org/details/bitsavers_alteramicrchannelAdapterHandbook199004_6648787/page/n4/mode/1up

https://archive.org/download/bitsavers_alteramicrchannelAdapterHandbook199004_6648787/Altera_Microchannel_Adapter_Handbook_199004.pdf
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