| ADR | HEXADR | NAME | Description | shadow | OS |
|---|
| 75 | $004B | CASSBT | Cassette boot flag | none | A |
| 1002 | $03EA | CASSBT | Cassette boot flag | none | X |
The Atari attempts both a disk and a cassette boot simultaneously. Zero here means no cassette boot was successful. See location 9/$9 BOOT