Programming the IBM 1401 computer: Subroutines, Trace Programs (debugging aids),
and advanced techniques
written by Emanuel Melichar (www. emelichar. com)

A programming note from E. Melichar
Melichar's 1401 computer experience (page from December 1962 Vita)

Federal Reserve System computer configurations, 1964

Indexing Techniques for the 1401 (from Newsletter, May 1, 1963, pp. 10-13)

Programming the 1401 Divide Feature (from Newsletter, July 15, 1963, pp. 7-12)

Logic and Use of the 1401 Division Worksheet, 2 pp.
1401 Division Worksheet

Logic and Use of the 1401 Multiplication Worksheet, 2 pp.
1401 Multiplication Worksheet

1401 General Compare Subroutine (includes diagram), 3 pp.

The Trace Method for debugging programs on the IBM 1401 (from Newsletter, August 23, 1963, pp. 9-25)

Trace programs for specified 1401 configurations:

   Minitrace 1, 16 pp.
   Minitrace 2, 16 pp.
   Minitrace 3, 5 pp.

   Branch Trace 1, 11 pp.
   Branch Trace 2, 11 pp.

System of 1401 programs for Processing Monthly Data, 17 pp.

Newsletters of the Federal Reserve System Committee on Computers in Research:

May 1, 1963
July 15, 1963
August 23, 1963

March 1964
July 1964
November 1964

1405 Disk Operation and Error Subroutines:

01 Disk Check and Error, 2 pp.

04 Full Track, Move Mode (includes diagram), 6 pp.
05 Sector, Move Mode (includes diagram), 4 pp.

10 Minimum Seek, Full Track, Move Mode, Arm 0, 4 pp.
11 Minimum Seek, Sector, Move Mode, Arm 0, 3 pp.