Difference between revisions of "VAXstation 100 firmware notes"
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(Start documenting D0 flags.) |
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| Line 17: | Line 17: | ||
|- | |- | ||
| 16 | | 16 | ||
| − | | Maintenance mode | + | | Maintenance mode. |
| + | |- | ||
| + | | 19 | ||
| + | | Powerup error. | ||
| + | |- | ||
| + | | 24 | ||
| + | | BBA done. | ||
|- | |- | ||
| 25 | | 25 | ||
| − | | Vertical retrace interrupt | + | | Vertical retrace interrupt. |
|} | |} | ||
Revision as of 13:58, 10 February 2023
Random notes from running the firmware in an emulator.
Memory map
Error LEDs
D0 flags
The firmware maintains a set of flags in register D0.
| Bit (decimal) | Meaning |
| 16 | Maintenance mode. |
| 19 | Powerup error. |
| 24 | BBA done. |
| 25 | Vertical retrace interrupt. |
