Printer for displaying characters, block numbers and block break line

A printer that is configured to print on a tape-type print medium, the printer comprising:

• a processor;
• and
• a memory configured to store computer-readable instructions that instruct the printer to perform a process comprising:
• displaying, on a display portion, characters, a block break line, and block numbers in a case where print data include block data and block break data, the block break line being a line segment that indicates a break position between adjacent blocks of a plurality of blocks, each of the plurality of blocks containing at least one line's worth of characters, the block numbers indicating sequence numbers for the plurality of blocks, the block data being data for the plurality of blocks, the block break data being data that indicate the break position, and the plurality of blocks being to be printed in a first direction in which the plurality of blocks are arrayed;
• and
• displaying, on the display portion, display content that is based on the print data, by scrolling the display content in the first direction, wherein
• the displaying, on the display portion, the characters, the block break line, and the block numbers includes, in a case where the display content is scrolled, while one of a foremost block and a rearmost block among the plurality of blocks is being displayed, displaying, on the display portion, a block number of the one of the foremost block and the rearmost block by moving the block number in relation to the one of the foremost block and the rearmost block, the foremost block being a block that is being displayed, on the display portion, foremost in the first direction, and the rearmost block being a block that is being displayed, on the display portion, rearmost in the first direction.