Mark 12

Summary: This manual describes the MARK12 program, which is designed to format and verify uncertified LINCtape for the PDP-12 computer. The program allows users to format tapes using standard LINCtape formats (512 or 896 blocks of 256 words each) or a special 129-word block format.

Key functions of the program include:

• Formatting the tape.
• Writing a test pattern to each block.
• Verifying the checksum for all blocks.
• Checking all backward block numbers.
• Verifying data from the last data block.

The document provides the loading and starting procedures, usage instructions, mechanical maintenance suggestions to ensure reliable operation, and a full program listing with flowcharts. The program is part of the Digital Equipment Corporation's Program Library and was published in 1971.