Bootstrap ROMs - Nakazoto/CenturionComputer GitHub Wiki
Bootstrap ROMs
The Centurion went through several different revisions over the years, utilizing different CPUs such as the CPU5 or CPU6, as well as different drives from Tape Drives to Hawk Drives to Finch Drives. As such, the manner in which system was bootstrapped changed over the years. The following is a list of all known bootstrap ROMs, there code (if backed up), and which machine they were used in.
12-byte diode ROM
CPU4/EE200, bootstrapped an autoloader MMIO card that would then boot the Hawk
1702 EPROM
CPU4, located on the DSK/AUT card, boots a Hawk, but also looks as SS3 and SS4
Dual 128 byte PROM
CPU4, located on late revision DSK/AUT, depending on installation location, would boot Hawk or Tape
6349 PROM v1
Early CPU5, located on backplane, depending on stored program, could load Hawk WIPL or Floppy WIPL
6349 PROM v2
Late CPU5, located on backplane, could load Hawk WIPL or Floppy WIPL, but also looked at SS1 for DIAG
6349 PROM v3
CPU6, located on backplane, would load a D= prompt, from there Hawk, Floppy/Finch, or CMD drives could be selected