Structure of SBCS conversion tables

The picture shows two conversion tables, labeled ASTOEB and EBTOAS. The tables are numbered X'0 to X'F along both axes, giving 256 possible values for each table.

In the example, the ASCII character X'47 converts to the EBCDIC character X'A3 and the EBCDIC character X'BC converts to the ASCII character X'23. (X'4 along the vertical axis and X'7 along the horizontal axis of the ASTOEB table gives the EBCDIC value X'A3. X'B along the vertical axis and X'C along the horizontal axis of the EBTOAS table gives the ASCII value X'23.)