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ebcdic-overpunch-decoding

Reference for the EBCDIC "overpunch" / zoned-decimal sign convention where the units position of a numeric field is replaced with a letter that encodes both a digit and a sign. Useful when reading mainframe-style fixed-length tapes whose amount fields appear as digits followed by a letter (e.g. "0000000000123D" or "0000000000045M").

tasks-extra/cobol-gl-batch-reconcile/environment/skills/ebcdic-overpunch-decoding/SKILL.md

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# EBCDIC overpunch (zoned decimal sign)

On classic mainframe tapes, signed numeric amounts are stored as N-1 digits
followed by a single byte where the high-order bits carry the sign and the
low-order bits carry the final decimal digit. When the file is converted to
ASCII / printable form, the last byte is rendered as a letter (or a brace).

## Sign and digit table

| Char | Sign | Last digit |       | Char | Sign | Last digit |
|------|------|------------|-------|------|------|------------|
| `{`  |  +   | 0          |       | `}`  |  −   | 0          |
| `A`  |  +   | 1          |       | `J`  |  −   | 1          |
| `B`  |  +   | 2          |       | `K`  |  −   | 2          |