VAXstation 100 firmware notes
From Computer History Wiki
Revision as of 13:07, 10 February 2023 by Larsbrinkhoff (talk | contribs) (→Error LEDs: Field service tech tip 7.)
Random notes from running the firmware in an emulator.
Memory map
Error LEDs
Indicates which test failed. During power-up, green light turned off. During idle loop, green light remains on.
Apparently there's a bug.
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. |
