VAXstation 100 firmware notes
From Computer History Wiki
Random notes from running the firmware in an emulator.
Memory map
Error LEDs
Indicates which test failed. During powerup, green light turned off. During idle loop, green light is in.
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. |
