The text read off it
[06.02.06]
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True channel, no specified units are assigned next.
If, during steps 1 and 2, there are insufficient units on the requested channels, a message prints to the effect that object-time tape assignment could not be completed because there were not enough units on the specified channels.
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Symbolic channel assignment is now made on the basis of those symbolic channels with the largest requirement being handled first. Starting with the highest true channel, the channels are processed to see if they will handle the symbolic channel requirements. When a true channel is found that contains sufficient available units to handle the symbolic channel, that true channel is chosen. If there is no true channel which will handle the symbolic channel requirements, a true channel is chosen to assign as many of the symbolic units to the channel as possible. The remaining symbolic units are now assigned by repeating the same process (i.e. finding the symbolic channel with the greatest requirement etc.).
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Model only specifications are now processed. Units are chosen starting at the highest channel number, first available unit.
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Symbolic units with no specification in the UNIT1 columns on the file card are now assigned.
If during steps 3, 4, or 5 there are insufficient tapes available for assignment a message prints saying there are not enough units on the system, and tape assignment could not be completed.
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* Secondary units are assigned last and on the same channel as the first unit where this is possible.
When the UNIT2 columns on the file card are blank the unit assigned is always the same as the unit assigned to UNIT1.