The world has a running Rational R1000/400 computer again (2019)
4 days ago
- #SCSI
- #VintageComputing
- #R1000
- SCSI command 0x0d identified as returning the length of burst errors corrected with ECC.
- Custom SCSI2SD firmware hacked to return specific MODE SENSE values, enabling R1000 to boot successfully.
- R1000 uses 'modern SCSI' with linear block-numbers for booting but operates with Cylinders, Heads, and Sectors in the real system.
- Successful restoration of R1000/400 computer functionality, including memory board reconfiguration and diagnostics.
- PSU repair and capacitor replacement documented, highlighting challenges with soldering and insulation deterioration.
- Discovery of EEPROM address bit swapping issue affecting reverse-engineering efforts.