Status: good
| Name | Description | Year | Manufacturer | Rom of | Clone of |
| apexc | All Purpose Electronic X-ray Computer (as described in 1957) | 1955 | Andrew Donald Booth | | |
| pdp1 | PDP-1 | 1961 | Digital Equipment Corporation | | |
|
Status: preliminary
| Name | Description | Year | Manufacturer | Rom of | Clone of |
| tx0_64kw | TX-0 original demonstrator (64 kWords of RAM) | 1956 | MIT | tx0_8kw | tx0_8kw |
| tx0_8kw | TX-0 upgraded system (8 kWords of RAM, new order code) | 1962 | MIT | | |
| tx0_8kwo | TX-0 upgraded system (8 kWords of RAM, old order code) | 1959 | MIT | tx0_8kw | tx0_8kw |
|