Difference between revisions of "VAXstation 100 firmware notes"
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(Start documenting D0 flags.) |
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==Error LEDs== | ==Error LEDs== | ||
[[Image:Vs100-diagnostic-led-errors.png]] | [[Image:Vs100-diagnostic-led-errors.png]] | ||
| + | |||
| + | ==D0 flags== | ||
| + | |||
| + | The firmware maintains a set of flags in register D0. | ||
| + | |||
| + | {| class="wikitable | ||
| + | |- | ||
| + | | Bit (decimal) | ||
| + | | Meaning | ||
| + | |- | ||
| + | | 16 | ||
| + | | Maintenance mode | ||
| + | |- | ||
| + | | 25 | ||
| + | | Vertical retrace interrupt | ||
| + | |} | ||
Revision as of 12:55, 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 |
| 25 | Vertical retrace interrupt |
