RCA 301 Programmer's Reference Manual
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S Input/Output Sense (IOS)General DescriptionThis instruction tests the desired status of the selected channel and chooses one of two sequences of instructions.FormatOperation — SN —Specifies device number.(60)s to (63)8 o° Model 380-14 channel.(64)s to (67)8 on Model 380-24 channel.A Address — A0 specifies the tests to be performed as follows:O p t i o n 0" 1 " Biti nN u m e r i cE q u i v al e n t T e st s2o 1 Test for card select (preselect) not permissible.21 2 Test for channel busy with read, write, or select (note 1).22 4 Test for device busy with read or write.23r 8 Test for block select (preselect) not permissible (note 2).24 & Test for specified block not within 8-10ms. from heads (note 3).O p t i o n 12° 1 Test for parity error, read-after-write error, or preamble error.21 2 Test for inoperability (note 4).22 4 Test for card released due to exceeding 32 unserviced revolutions.23 8 Test for illegal operation or magazine absent (note 5).24 & Test for block 255 exceeded without A-B Equality.O p t i o n 22° 1 Test for specified block not within 6-8ms. from heads (note 6).21 2 Test for single bit corrected error.22 1 Test for count equals limit (set only once).23 1 Test for count exceeds limit* (set each time card is placed oncapstan after count has been exceeded).* This limit is manually set up in the 3488 unit.— AXJ A2 — Must be zeros (00).— A3 — Specifies Sense Option:A3 = 0 — specifies option 0.A3 = 1 — specifies option 1.A3 = 2 — specifies option 2.B Address — HSM location of the next instruction to be executed if the condition or conditions being testedare present.XV-9 |
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