mme gespec
MME GESPEC sets things up so that an I/O request will be accepted, but the actual I/O will not begin until a special interrupt occurs on the device. MME GESPEC can also turn off this kind of special interrupt requirement when it has been set by a previous MME GESPEC call.
MME GESPEC may be performed on a card reader, care punch, or printer. Other devices are not allowed.
When MME GESPEC returns, the value of the A register will indicate success or failure. Possible values are:
0 -- success 1 -- no action taken; file code not in PAT 2 -- no action taken; invalid device
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