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Thanks to Hale & Jim for much helpful stuff. Too much for me to have understood it all as yet, but I think I can continue a couple of points. First my unhelpful choice of terminology: > SwDma/MwDma/UDma I got tired of writing out single-word Dma, multi-word Dma, and ultra Dma. I didn't mean to introduce any confusion. Are there preferred abbreviations? Another example of inadequately abbreviated Ansi text is power on reset, hardware reset via pin 1 RESET-, software reset, execute device diagnostics, device reset, and a write of x1F7 command while selected by DEV but BSY:DRQ != 0:0 ... In the beginning, on principle, I used the Ansi terms because they were the Ansi terms, but the social environment here quickly drove me too abbreviations that sound less like one other: PORST, PRST, BRST, XRST, DRST, UCRST. I know these abbreviations are too obscure for general use, so I more or less carefully edit any text I post here to use the more verbose but standard substitutes. Pat LaVarre Subscribe/Unsubscribe instructions can be found at www.t13.org.
