| APE(X)C | ⊕ 1950 | ↓ ↑ ⊕ Excluded from Sammet | Initial orders | ⊕ United Kingdom | Coding system for the APE(X)C |
| ARC | ⊕ 1947 | ↓ ↑ ⊕ Excluded from Sammet | Initial orders | ⊕ United Kingdom | Assembler for Booth |
| C-10 | ⊕ 1949 | ↓ ↑ ⊕ Multi-purpose | Initial orders | ⊕ United States | First Mnemonic codeset |
| CYCLONE Initial orders | ⊕ 1955 | ↓ ↑ ⊕ Excluded from Sammet | Initial orders | ⊕ United States | CYCLONE's initial orders |
| DOI | ⊕ 1952 | ↓ ↑ ⊕ Excluded from Sammet | Initial orders | ⊕ United States | Wheeler |
| EDSAC Initial Orders | ⊕ 1948 | ↓ ↑ ⊕ Excluded from Sammet | Initial orders | ⊕ United Kingdom | First ever assembler system |
| ENIAC short code | ⊕ 1946 | ↓ ↑ ⊕ Excluded from Sammet | Initial orders | ⊕ United States | Clippinger/von Neumann short code |
| ORACLE Order Code | ⊕ 1957 | ↓ ↑ ⊕ Excluded from Sammet | Initial orders | ⊕ United States | Oak Ridge initial orders |
| RAL | ⊕ 1950 | ↓ ↑ ⊕ Excluded from Sammet | Initial orders | ⊕ United Kingdom | Regional Assembly Language |
| Seeber instructions | ⊕ 1949 | ↓ ↑ ⊕ Excluded from Sammet | Initial orders | ⊕ United States | First soft-addressable memory |
| SYLLIAC Initial orders | ⊕ 1954 | ↓ ↑ ⊕ Excluded from Sammet | Initial orders | ⊕ Australia | IO for the SYlliac |
| TAC initial orders | ⊕ 1955 | ↓ ↑ ⊕ Excluded from Sammet | Initial orders | ⊕ Japan | Initial order for the TAC computer |
| WEIZAC Initial orders | ⊕ 1954 | ↓ ↑ ⊕ Excluded from Sammet | Initial orders | ⊕ United States | IO for the WEIZAC |
| Williams | ⊕ 1948 | ↓ ↑ ⊕ Excluded from Sammet | Initial orders | ⊕ United Kingdom | Proto-index register for the Manchester Copmuter |