| Aiken CPC translator | ⊕ 1948 | ↓ ↑ ⊕ Excluded from Sammet | ⊕ Symbolic assemblers | ⊕ United States | Proposed relay code for the Harvard Mark III |
| EDSAC Initial Orders | ⊕ 1948 | ↓ ↑ ⊕ Excluded from Sammet | ⊕ Initial orders | ⊕ United Kingdom | First ever assembler system |
| Williams | ⊕ 1948 | ↓ ↑ ⊕ Excluded from Sammet | ⊕ Initial orders | ⊕ United Kingdom | Proto-index register for the Manchester Copmuter |