The SEQNO Command [MLEPC]

The SEQNO command is used to number the command blocks in the tape file. This is typically an N register followed by an integer value that steadily increases throughout the program. This command is valid for all machine types but may not be available on specific machines.

The first format, ON/OFF, can be used to start and stop the outputting of sequence numbers on subsequent blocks of tape. Coding SEQNO/ON will resume sequence numbering. Coding SEQNO/ OFF will disable sequence numbering. A SEQNO/ON command is not necessary at the start of the program as GENER will default to what is best for the machine. A SEQNO/OFF command will be ignored if the machine requires a sequence number on every block.

The SEQNO/AUTO command causes the following command blocks to be numbered using the cutter location (CL) record number belonging to the record that created the block. If multiple tape blocks are generated as a result of a single CL record, then the same sequence number will be repeated.

The SEQNO/CONST,value command will set the sequence number of one or more tape blocks to the indicated value. If the CONST minor word is coded, then all subsequent blocks will be numbered the same until another SEQNO command is coded. If the CONST minor word is omitted, then only the next block will have the specified sequence number, thereafter regular sequence numbering will resume.

The last format provides a means of specifying a starting sequence value, the amount by which to increment the sequence register each time it is output and a value requesting output of sequence numbers every count blocks. If the starting value is omitted, the next sequence number will be the last one output plus the specified increment. If the count value is omitted, then the last specified (or default) count value will be used. Normally sequence numbers are output on every block. count values greater than 1 will be ignored if the machine requires a sequence number on every block.