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Guy Harris (talk | contribs) The Systems Reference Library is probably best thought of as a series of books. Call it the "IBM Systems Reference Library" (not sure whether the "IBM" on the cover page is just "this is from IBM" or is part of that phrase). |
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</pre>
Six commands are defined, in the low-order bits of the command field (0-7). The high-order four (or six) bits are ''modifiers'' ('M') for some commands, or are ignored. The commands are:
<pre>
0100 - Sense
1000 - Transfer in Channel (TIC)
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