| (Reserved) |
0000–0099 |
| Service Subroutines |
0100–0299 |
| Common Blocks |
0300–0339 |
| Operator Messages |
0340–0344 |
| (Reserved) |
0345–0400 |
| Run-time Environment |
0401–0499 |
| Implicit Routines |
0500–0599 |
| Intrinsic Functions |
0600–0699 |
| (Reserved) |
0700–0999 |
| I/O |
1000–1999 |
| Input Conversion |
1000–1019 |
| Sequential I/O |
1020–1069 |
| Direct I/O |
1070–1099 |
| Keyed I/O |
1100–1179 |
| Formatted I/O |
1180–1199 |
| Unformatted I/O |
1200–1209 |
| List Directed I/O |
1210–1219 |
| Namelist I/O |
1220–1249 |
| Striped I/O |
1250–1269 |
| Asynchronous I/O |
1270–1329 |
| VSAM I/O |
1330–1339 |
| INQUIRE |
1340–1359 |
| CLOSE semantics |
1360–1379 |
| OPEN / DEFINE FILE semantics |
1380–1449 |
| (Reserved) |
1450–1499 |
| System-detected errors |
1500–1549 |
| Command / Macro / Service failure |
1550–1599 |
| File Disconnection |
1900–1909 |
| End of Data |
1910–1914 |
| Invalid unit |
1915–1919 |
| Miscellaneous |
1920–1999 |
| Multitasking Facility (MTF) |
2000–2099 |
| AUTOTASK |
2000–2029 |
| AUTOTASK DD Statement |
2030–2039 |
| Function invalid |
2040–2049 |
| Miscellaneous |
2050–2099 |
| Vector |
2100–2119 |
| Run-Time Options |
2120–2129 |
| Miscellaneous |
2130–2199 |
| Separation Tool |
2200–2249 |
| Static Debug |
2250–2279 |
| Miscellaneous |
2280–2999 |
| (Reserved) |
3000–9999 |