VAXstation 100 firmware notes

From Computer History Wiki
Revision as of 14:57, 10 February 2023 by Larsbrinkhoff (talk | contribs) (Interrupt table.)
Jump to: navigation, search

Random notes from running the firmware in an emulator.

Memory map

Vs100-memory-map.png

Error LEDs

Indicates which test failed. During power-up, green light turned off. During idle loop, green light remains on.

Vs100-diagnostic-led-errors.png

Apparently there's a bug.

VS100-TT-7.png

Interrupts

All VS100 interrupts use the autovector feature.

VS100-interrupts.png

D0 flags

The firmware maintains a set of flags in register D0.

Bit (decimal) Meaning
16 Manufacturing mode.
19 Power-up error.
24 BBA done.
25 Vertical retrace interrupt.
Retrieved from "https://gunkies.org/w/index.php?title=VAXstation_100_firmware_notes&oldid=28586"